cregit-Linux how code gets into the kernel

Release 4.9 init/main.c

Directory: init
/*
 *  linux/init/main.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  GK 2/5/95  -  Changed to support mounting root fs via NFS
 *  Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
 *  Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
 *  Simplified starting of init:  Michael A. Griffith <grif@acm.org>
 */


#define DEBUG		
/* Enable initcall_debug */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/kernel.h>
#include <linux/syscalls.h>
#include <linux/stackprotector.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/bootmem.h>
#include <linux/acpi.h>
#include <linux/tty.h>
#include <linux/percpu.h>
#include <linux/kmod.h>
#include <linux/vmalloc.h>
#include <linux/kernel_stat.h>
#include <linux/start_kernel.h>
#include <linux/security.h>
#include <linux/smp.h>
#include <linux/profile.h>
#include <linux/rcupdate.h>
#include <linux/moduleparam.h>
#include <linux/kallsyms.h>
#include <linux/writeback.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
#include <linux/cgroup.h>
#include <linux/efi.h>
#include <linux/tick.h>
#include <linux/interrupt.h>
#include <linux/taskstats_kern.h>
#include <linux/delayacct.h>
#include <linux/unistd.h>
#include <linux/rmap.h>
#include <linux/mempolicy.h>
#include <linux/key.h>
#include <linux/buffer_head.h>
#include <linux/page_ext.h>
#include <linux/debug_locks.h>
#include <linux/debugobjects.h>
#include <linux/lockdep.h>
#include <linux/kmemleak.h>
#include <linux/pid_namespace.h>
#include <linux/device.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/idr.h>
#include <linux/kgdb.h>
#include <linux/ftrace.h>
#include <linux/async.h>
#include <linux/kmemcheck.h>
#include <linux/sfi.h>
#include <linux/shmem_fs.h>
#include <linux/slab.h>
#include <linux/perf_event.h>
#include <linux/file.h>
#include <linux/ptrace.h>
#include <linux/blkdev.h>
#include <linux/elevator.h>
#include <linux/sched_clock.h>
#include <linux/context_tracking.h>
#include <linux/random.h>
#include <linux/list.h>
#include <linux/integrity.h>
#include <linux/proc_ns.h>
#include <linux/io.h>

#include <asm/io.h>
#include <asm/bugs.h>
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/cacheflush.h>

static int kernel_init(void *);

extern void init_IRQ(void);
extern void fork_init(void);
extern void radix_tree_init(void);

/*
 * Debug helper: via this flag we know that we are in 'early bootup code'
 * where only the boot processor is running with IRQ disabled.  This means
 * two things - IRQ must not be enabled before the flag is cleared and some
 * operations which are not allowed with IRQ disabled are allowed while the
 * flag is set.
 */

bool early_boot_irqs_disabled __read_mostly;


enum system_states system_state __read_mostly;

EXPORT_SYMBOL(system_state);

/*
 * Boot command-line arguments
 */

#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT

#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT

extern void time_init(void);
/* Default late time init is NULL. archs can override this later. */

void (*__initdata late_time_init)(void);

/* Untouched command line saved by arch-specific code. */

char __initdata boot_command_line[COMMAND_LINE_SIZE];
/* Untouched saved command line (eg. for /proc) */

char *saved_command_line;
/* Command line for parameter parsing */

static char *static_command_line;
/* Command line for per-initcall parameter parsing */

static char *initcall_command_line;


static char *execute_command;

static char *ramdisk_execute_command;

/*
 * Used to generate warnings if static_key manipulation functions are used
 * before jump_label_init is called.
 */

bool static_key_initialized __read_mostly;

EXPORT_SYMBOL_GPL(static_key_initialized);

/*
 * If set, this is an indication to the drivers that reset the underlying
 * device before going ahead with the initialization otherwise driver might
 * rely on the BIOS and skip the reset operation.
 *
 * This is useful if kernel is booting in an unreliable environment.
 * For ex. kdump situation where previous kernel has crashed, BIOS has been
 * skipped and devices will be in unknown state.
 */

unsigned int reset_devices;

EXPORT_SYMBOL(reset_devices);




static int __init set_reset_devices(char *str)
{
	reset_devices = 1;
	return 1;
}


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Total18100.00%1100.00%



__setup("reset_devices", set_reset_devices);


static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };

const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };


static const char *panic_later, *panic_param;

extern const struct obs_kernel_param __setup_start[], __setup_end[];




static bool __init obsolete_checksetup(char *line)
{
	const struct obs_kernel_param *p;
	bool had_early_param = false;

	p = __setup_start;
	do {
		int n = strlen(p->str);
		if (parameqn(line, p->str, n)) {
			if (p->early) {
				/* Already done in parse_early_param?
                                 * (Needs exact match on param part).
                                 * Keep iterating, as we can have early
                                 * params and __setups of same names 8( */
				if (line[n] == '\0' || line[n] == '=')
					had_early_param = true;
			} else if (!p->setup_func) {
				pr_warn("Parameter %s is obsolete, ignored\n",
					p->str);
				return true;
			} else if (p->setup_func(line + n))
				return true;
		}
		p++;
	} while (p < __setup_end);

	return had_early_param;
}


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pre-gitpre-git6951.88%327.27%


andrew mortonandrew morton2720.30%218.18%


dmitry torokhovdmitry torokhov1914.29%19.09%


rusty russellrusty russell118.27%327.27%


yaowei baiyaowei bai64.51%19.09%


michal schmidtmichal schmidt10.75%19.09%


Total133100.00%11100.00%



/*
 * This should be approx 2 Bo*oMips to start (note initial shift), and will
 * still work even if initially too large, it will just take slightly longer
 */

unsigned long loops_per_jiffy = (1<<12);

EXPORT_SYMBOL(loops_per_jiffy);




static int __init debug_kernel(char *str)
{
	console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
	return 0;
}


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borislav petkovborislav petkov15.56%133.33%


yinghai luyinghai lu15.56%133.33%


Total18100.00%3100.00%






static int __init quiet_kernel(char *str)
{
	console_loglevel = CONSOLE_LOGLEVEL_QUIET;
	return 0;
}


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pre-gitpre-git1688.89%133.33%


borislav petkovborislav petkov15.56%133.33%


yinghai luyinghai lu15.56%133.33%


Total18100.00%3100.00%



early_param("debug", debug_kernel);
early_param("quiet", quiet_kernel);




static int __init loglevel(char *str)
{
	int newlevel;

	/*
         * Only update loglevel value when a correct setting was passed,
         * to prevent blind crashes (when loglevel being set to 0) that
         * are quite hard to debug
         */
	if (get_option(&str, &newlevel)) {
		console_loglevel = newlevel;
		return 0;
	}

	return -EINVAL;
}


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matthias kunzematthias kunze2153.85%133.33%


alexander sverdlinalexander sverdlin1743.59%133.33%


alex riesenalex riesen12.56%133.33%


Total39100.00%3100.00%



early_param("loglevel", loglevel);

/* Change NUL term back to "=", to make "param" the whole string. */



static int __init repair_env_string(char *param, char *val,
				    const char *unused, void *arg)
{
	if (val) {
		/* param=val or param="val"? */
		if (val == param+strlen(param)+1)
			val[-1] = '=';
		else if (val == param+strlen(param)+2) {
			val[-2] = '=';
			memmove(val-1, val, strlen(val)+1);
			val--;
		} else
			BUG();
	}
	return 0;
}


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rusty russellrusty russell6260.78%220.00%


pre-gitpre-git1514.71%440.00%


len brownlen brown1110.78%110.00%


jim cromiejim cromie54.90%110.00%


chris metcalfchris metcalf54.90%110.00%


luis r. rodriguezluis r. rodriguez43.92%110.00%


Total102100.00%10100.00%



/* Anything after -- gets handed straight to init. */



static int __init set_init_arg(char *param, char *val,
			       const char *unused, void *arg)
{
	unsigned int i;

	if (panic_later)
		return 0;

	repair_env_string(param, val, unused, NULL);

	for (i = 0; argv_init[i]; i++) {
		if (i == MAX_INIT_ARGS) {
			panic_later = "init";
			panic_param = param;
			return 0;
		}
	}
	argv_init[i] = param;
	return 0;
}


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rusty russellrusty russell8593.41%150.00%


luis r. rodriguezluis r. rodriguez66.59%150.00%


Total91100.00%2100.00%



/*
 * Unknown boot options get handed to init, unless they look like
 * unused parameters (modprobe will find them in /proc/cmdline).
 */



static int __init unknown_bootoption(char *param, char *val,
				     const char *unused, void *arg)
{
	repair_env_string(param, val, unused, NULL);

	/* Handle obsolete-style parameters */
	if (obsolete_checksetup(param))
		return 0;

	/* Unused module parameter. */
	if (strchr(param, '.') && (!val || strchr(param, '.') < val))
		return 0;

	if (panic_later)
		return 0;

	if (val) {
		/* Environment option */
		unsigned int i;
		for (i = 0; envp_init[i]; i++) {
			if (i == MAX_INIT_ENVS) {
				panic_later = "env";
				panic_param = param;
			}
			if (!strncmp(param, envp_init[i], val - param))
				break;
		}
		envp_init[i] = param;
	} else {
		/* Command line option */
		unsigned int i;
		for (i = 0; argv_init[i]; i++) {
			if (i == MAX_INIT_ARGS) {
				panic_later = "init";
				panic_param = param;
			}
		}
		argv_init[i] = param;
	}
	return 0;
}


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rusty russellrusty russell8040.40%212.50%


pre-gitpre-git4321.72%850.00%


chris metcalfchris metcalf2110.61%16.25%


andrew mortonandrew morton2110.61%16.25%


william lee irwin iiiwilliam lee irwin iii189.09%16.25%


greg kroah-hartmangreg kroah-hartman73.54%16.25%


luis r. rodriguezluis r. rodriguez63.03%16.25%


tetsuo handatetsuo handa21.01%16.25%


Total198100.00%16100.00%






static int __init init_setup(char *str)
{
	unsigned int i;

	execute_command = str;
	/*
         * In case LILO is going to boot us with default command line,
         * it prepends "auto" before the whole cmdline which makes
         * the shell think it should execute a script with such name.
         * So we ignore all arguments entered _before_ init=... [MJ]
         */
	for (i = 1; i < MAX_INIT_ARGS; i++)
		argv_init[i] = NULL;
	return 1;
}

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rusty russellrusty russell4297.67%150.00%


adam kropelinadam kropelin12.33%150.00%


Total43100.00%2100.00%



__setup("init=", init_setup);




static int __init rdinit_setup(char *str)
{
	unsigned int i;

	ramdisk_execute_command = str;
	/* See "auto" comment in init_setup */
	for (i = 1; i < MAX_INIT_ARGS; i++)
		argv_init[i] = NULL;
	return 1;
}

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olof johanssonolof johansson43100.00%1100.00%


Total43100.00%1100.00%



__setup("rdinit=", rdinit_setup);

#ifndef CONFIG_SMP

static const unsigned int setup_max_cpus = NR_CPUS;



static inline void setup_nr_cpu_ids(void) { }

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Total8100.00%1100.00%






static inline void smp_prepare_cpus(unsigned int maxcpus) { }

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rusty russellrusty russell10100.00%1100.00%


Total10100.00%1100.00%



#endif

/*
 * We need to store the untouched command line for future reference.
 * We also need to store the touched command line since the parameter
 * parsing is performed in place, and we should allow a component to
 * store reference of name/value for future reference.
 */



static void __init setup_command_line(char *command_line)
{
	saved_command_line =
		memblock_virt_alloc(strlen(boot_command_line) + 1, 0);
	initcall_command_line =
		memblock_virt_alloc(strlen(boot_command_line) + 1, 0);
	static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0);
	strcpy(saved_command_line, boot_command_line);
	strcpy(static_command_line, command_line);
}


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alon bar-levalon bar-lev4770.15%133.33%


krzysztof mazurkrzysztof mazur1116.42%133.33%


santosh shilimkarsantosh shilimkar913.43%133.33%


Total67100.00%3100.00%



/*
 * We need to finalize in a non-__init function or else race conditions
 * between the root thread and the init thread may cause start_kernel to
 * be reaped by free_initmem before the root thread has proceeded to
 * cpu_idle.
 *
 * gcc-3.4 accidentally inlines this function, so use noinline.
 */

static __initdata DECLARE_COMPLETION(kthreadd_done);




static noinline void __ref rest_init(void)
{
	int pid;

	rcu_scheduler_starting();
	/*
         * We need to spawn init first so that it obtains pid 1, however
         * the init task will end up wanting to create kthreads, which, if
         * we schedule it before we create kthreadd, will OOPS.
         */
	kernel_thread(kernel_init, NULL, CLONE_FS);
	numa_default_policy();
	pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
	rcu_read_lock();
	kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
	rcu_read_unlock();
	complete(&kthreadd_done);

	/*
         * The boot idle thread must execute schedule()
         * at least once to get things moving:
         */
	init_idle_bootup_task(current);
	schedule_preempt_disabled();
	/* Call into cpu_idle with preempt disabled */
	cpu_startup_entry(CPUHP_ONLINE);
}


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eric w. biedermaneric w. biederman2227.85%15.56%


linus torvaldslinus torvalds1518.99%15.56%


paul e. mckenneypaul e. mckenney911.39%211.11%


ingo molnaringo molnar810.13%211.11%


peter zijlstrapeter zijlstra78.86%211.11%


thomas gleixnerthomas gleixner56.33%211.11%


pavel emelianovpavel emelianov45.06%15.56%


andi kleenandi kleen33.80%15.56%


andrew mortonandrew morton22.53%211.11%


nick pigginnick piggin11.27%15.56%


rakib mullickrakib mullick11.27%15.56%


fabian frederickfabian frederick11.27%15.56%


sam ravnborgsam ravnborg11.27%15.56%


Total79100.00%18100.00%



/* Check for early params. */



static int __init do_early_param(char *param, char *val,
				 const char *unused, void *arg)
{
	const struct obs_kernel_param *p;

	for (p = __setup_start; p < __setup_end; p++) {
		if ((p->early && parameq(param, p->str)) ||
		    (strcmp(param, "console") == 0 &&
		     strcmp(p->str, "earlycon") == 0)
		) {
			if (p->setup_func(val) != 0)
				pr_warn("Malformed early option '%s'\n", param);
		}
	}
	/* We accept everything at this stage. */
	return 0;
}


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andrew mortonandrew morton7367.59%228.57%


yinghai luyinghai lu2422.22%114.29%


jim cromiejim cromie54.63%114.29%


luis r. rodriguezluis r. rodriguez43.70%114.29%


rusty russellrusty russell10.93%114.29%


michal schmidtmichal schmidt10.93%114.29%


Total108100.00%7100.00%






void __init parse_early_options(char *cmdline)
{
	parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
		   do_early_param);
}


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magnus dammmagnus damm2379.31%133.33%


pawel mollpawel moll413.79%133.33%


luis r. rodriguezluis r. rodriguez26.90%133.33%


Total29100.00%3100.00%



/* Arch code calls this early on, or if not, just before other parsing. */



void __init parse_early_param(void)
{
	static int done __initdata;
	static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;

	if (done)
		return;

	/* All fall through to do_early_param. */
	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
	parse_early_options(tmp_cmdline);
	done = 1;
}


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andrew mortonandrew morton4191.11%125.00%


fabian frederickfabian frederick24.44%125.00%


alon bar-levalon bar-lev12.22%125.00%


magnus dammmagnus damm12.22%125.00%


Total45100.00%4100.00%






void __init __weak smp_setup_processor_id(void)
{
}


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andrew mortonandrew morton562.50%150.00%


benjamin herrenschmidtbenjamin herrenschmidt337.50%150.00%


Total8100.00%2100.00%



# if THREAD_SIZE >= PAGE_SIZE



void __init __weak thread_stack_cache_init(void)
{
}

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benjamin herrenschmidtbenjamin herrenschmidt787.50%150.00%


linus torvaldslinus torvalds112.50%150.00%


Total8100.00%2100.00%



#endif

/*
 * Set up kernel memory allocators
 */



static void __init mm_init(void)
{
	/*
         * page_ext requires contiguous pages,
         * bigger than MAX_ORDER unless SPARSEMEM.
         */
	page_ext_init_flatmem();
	mem_init();
	kmem_cache_init();
	percpu_init_late();
	pgtable_init();
	vmalloc_init();
	ioremap_huge_init();
}


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pekka j enbergpekka j enberg1858.06%116.67%


joonsoo kimjoonsoo kim412.90%116.67%


toshi kanitoshi kani39.68%116.67%


tejun heotejun heo39.68%116.67%


benjamin herrenschmidtbenjamin herrenschmidt26.45%116.67%


kirill a. shutemovkirill a. shutemov13.23%116.67%


Total31100.00%6100.00%






asmlinkage __visible void __init start_kernel(void)
{
	char *command_line;
	char *after_dashes;

	set_task_stack_end_magic(&init_task);
	smp_setup_processor_id();
	debug_objects_early_init();

	/*
         * Set up the the initial canary ASAP:
         */
	boot_init_stack_canary();

	cgroup_init_early();

	local_irq_disable();
	early_boot_irqs_disabled = true;

/*
 * Interrupts are still disabled. Do necessary setups, then
 * enable them
 */
	boot_cpu_init();
	page_address_init();
	pr_notice("%s", linux_banner);
	setup_arch(&command_line);
	mm_init_cpumask(&init_mm);
	setup_command_line(command_line);
	setup_nr_cpu_ids();
	setup_per_cpu_areas();
	boot_cpu_state_init();
	smp_prepare_boot_cpu();	/* arch-specific boot-cpu hooks */

	build_all_zonelists(NULL, NULL);
	page_alloc_init();

	pr_notice("Kernel command line: %s\n", boot_command_line);
	parse_early_param();
	after_dashes = parse_args("Booting kernel",
				  static_command_line, __start___param,
				  __stop___param - __start___param,
				  -1, -1, NULL, &unknown_bootoption);
	if (!IS_ERR_OR_NULL(after_dashes))
		parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
			   NULL, set_init_arg);

	jump_label_init();

	/*
         * These use large bootmem allocations and must precede
         * kmem_cache_init()
         */
	setup_log_buf(0);
	pidhash_init();
	vfs_caches_init_early();
	sort_main_extable();
	trap_init();
	mm_init();

	/*
         * Set up the scheduler prior starting any interrupts (such as the
         * timer interrupt). Full topology setup happens at smp_init()
         * time - but meanwhile we still have a functioning scheduler.
         */
	sched_init();
	/*
         * Disable preemption - early bootup scheduling is extremely
         * fragile until we cpu_idle() for the first time.
         */
	preempt_disable();
	if (WARN(!irqs_disabled(),
		 "Interrupts were enabled *very* early, fixing it\n"))
		local_irq_disable();
	idr_init_cache();
	rcu_init();

	/* trace_printk() and trace points may be used after this */
	trace_init();

	context_tracking_init();
	radix_tree_init();
	/* init some links before init_ISA_irqs() */
	early_irq_init();
	init_IRQ();
	tick_init();
	rcu_init_nohz();
	init_timers();
	hrtimers_init();
	softirq_init();
	timekeeping_init();
	time_init();
	sched_clock_postinit();
	printk_nmi_init();
	perf_event_init();
	profile_init();
	call_function_init();
	WARN(!irqs_disabled(), "Interrupts were enabled early\n");
	early_boot_irqs_disabled = false;
	local_irq_enable();

	kmem_cache_init_late();

	/*
         * HACK ALERT! This is early. We're enabling the console before
         * we've done PCI setups etc, and console_init() must be aware of
         * this. But we do want output early, in case something goes wrong.
         */
	console_init();
	if (panic_later)
		panic("Too many boot %s vars at `%s'", panic_later,
		      panic_param);

	lockdep_info();

	/*
         * Need to run this when irqs are enabled, because it wants
         * to self-test [hard/soft]-irqs on/off lock inversion bugs
         * too:
         */
	locking_selftest();

#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start && !initrd_below_start_ok &&
	    page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
		pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
		    page_to_pfn(virt_to_page((void *)initrd_start)),
		    min_low_pfn);
		initrd_start = 0;
	}
#endif
	page_ext_init();
	debug_objects_mem_init();
	kmemleak_init();
	setup_per_cpu_pageset();
	numa_policy_init();
	if (late_time_init)
		late_time_init();
	sched_clock_init();
	calibrate_delay();
	pidmap_init();
	anon_vma_init();
	acpi_early_init();
#ifdef CONFIG_X86
	if (efi_enabled(EFI_RUNTIME_SERVICES))
		efi_enter_virtual_mode();
#endif
#ifdef CONFIG_X86_ESPFIX64
	/* Should be run before the first non-init thread is created */
	init_espfix_bsp();
#endif
	thread_stack_cache_init();
	cred_init();
	fork_init();
	proc_caches_init();
	buffer_init();
	key_init();
	security_init();
	dbg_late_init();
	vfs_caches_init();
	signals_init();
	/* rootfs populating might need page-writeback */
	page_writeback_init();
	proc_root_init();
	nsfs_init();
	cpuset_init();
	cgroup_init();
	taskstats_init_early();
	delayacct_init();

	check_bugs();

	acpi_subsystem_init();
	sfi_init_late();

	if (efi_enabled(EFI_RUNTIME_SERVICES)) {
		efi_late_init();
		efi_free_boot_services();
	}

	ftrace_init();

	/* Do the rest non-__init'ed, we're now alive */
	rest_init();
}


Contributors
PersonTokensPropCommitsCommitProp
pre-gitpre-git8817.39%2921.80%


rusty russellrusty russell458.89%43.01%


andrew mortonandrew morton397.71%129.02%


linus torvaldslinus torvalds285.53%86.02%


pekka j enbergpekka j enberg275.34%43.01%


geert uytterhoevengeert uytterhoeven203.95%21.50%


ingo molnaringo molnar193.75%53.76%


thomas gleixnerthomas gleixner173.36%53.76%


steven rostedtsteven rostedt163.16%32.26%


heiko carstensheiko carstens152.96%10.75%


josh triplettjosh triplett122.37%21.50%


ard van breemenard van breemen91.78%10.75%


h. peter anvinh. peter anvin91.78%21.50%


john stultzjohn stultz91.78%21.50%


tejun heotejun heo81.58%21.50%


mike travismike travis71.38%21.50%


alon bar-levalon bar-lev71.38%10.75%


yinghai luyinghai lu71.38%21.50%


aaron tomlinaaron tomlin61.19%10.75%


rafael j. wysockirafael j. wysocki61.19%21.50%


matt flemingmatt fleming61.19%10.75%


shailabh nagarshailabh nagar61.19%21.50%


david howellsdavid howells61.19%21.50%


paul menagepaul menage50.99%10.75%


stas sergeevstas sergeev40.79%10.75%


daniel thompsondaniel thompson40.79%10.75%


catalin marinascatalin marinas40.79%21.50%


andi kleenandi kleen40.79%21.50%


luis r. rodriguezluis r. rodriguez40.79%10.75%


takao indohtakao indoh30.59%10.75%


peter zijlstrapeter zijlstra30.59%10.75%


haicheng lihaicheng li30.59%10.75%


jason wesseljason wessel30.59%21.50%


al viroal viro30.59%10.75%


christoph lameterchristoph lameter30.59%10.75%


stephane eranianstephane eranian30.59%10.75%


feng tangfeng tang30.59%10.75%


lei minglei ming30.59%10.75%


frederic weisbeckerfrederic weisbecker30.59%10.75%


stephen boydstephen boyd30.59%10.75%


jeremy fitzhardingejeremy fitzhardinge30.59%10.75%


petr mladekpetr mladek30.59%10.75%


yang shiyang shi30.59%10.75%


dipankar sarmadipankar sarma30.59%10.75%


paul jacksonpaul jackson20.40%10.75%


li zefanli zefan20.40%10.75%


jiang liujiang liu20.40%10.75%


pawel mollpawel moll20.40%10.75%


alex riesenalex riesen20.40%10.75%


benjamin herrenschmidtbenjamin herrenschmidt20.40%10.75%


tetsuo handatetsuo handa20.40%10.75%


fabian frederickfabian frederick20.40%10.75%


chris wrightchris wright20.40%21.50%


greg kroah-hartmangreg kroah-hartman20.40%10.75%


john levonjohn levon20.40%10.75%


heinrich schuchardtheinrich schuchardt10.20%10.75%


mel gormanmel gorman10.20%10.75%


Total506100.00%133100.00%



/* Call all constructor functions linked into the kernel. */



static void __init do_ctors(void)
{
#ifdef CONFIG_CONSTRUCTORS
	ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;

	for (; fn < (ctor_fn_t *) __ctors_end; fn++)
		(*fn)();
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
peter oberparleiterpeter oberparleiter4090.91%150.00%


h hartley sweetenh hartley sweeten49.09%150.00%


Total44100.00%2100.00%




bool initcall_debug;
core_param(initcall_debug, initcall_debug, bool, 0644);

#ifdef CONFIG_KALLSYMS

struct blacklist_entry {
	
struct list_head next;
	
char *buf;
};

static __initdata_or_module LIST_HEAD(blacklisted_initcalls);




static int __init initcall_blacklist(char *str)
{
	char *str_entry;
	struct blacklist_entry *entry;

	/* str argument is a comma-separated list of functions */
	do {
		str_entry = strsep(&str, ",");
		if (str_entry) {
			pr_debug("blacklisting initcall %s\n", str_entry);
			entry = alloc_bootmem(sizeof(*entry));
			entry->buf = alloc_bootmem(strlen(str_entry) + 1);
			strcpy(entry->buf, str_entry);
			list_add(&entry->next, &blacklisted_initcalls);
		}
	} while (str_entry);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
prarit bhargavaprarit bhargava100100.00%1100.00%


Total100100.00%1100.00%






static bool __init_or_module initcall_blacklisted(initcall_t fn)
{
	struct blacklist_entry *entry;
	char fn_name[KSYM_SYMBOL_LEN];
	unsigned long addr;

	if (list_empty(&blacklisted_initcalls))
		return false;

	addr = (unsigned long) dereference_function_descriptor(fn);
	sprint_symbol_no_offset(fn_name, addr);

	/*
         * fn will be "function_name [module_name]" where [module_name] is not
         * displayed for built-in init functions.  Strip off the [module_name].
         */
	strreplace(fn_name, ' ', '\0');

	list_for_each_entry(entry, &blacklisted_initcalls, next) {
		if (!strcmp(fn_name, entry->buf)) {
			pr_debug("initcall %s blacklisted\n", fn_name);
			return true;
		}
	}

	return false;
}

Contributors
PersonTokensPropCommitsCommitProp
prarit bhargavaprarit bhargava6766.34%240.00%


rasmus villemoesrasmus villemoes3029.70%240.00%


geliang tanggeliang tang43.96%120.00%


Total101100.00%5100.00%



#else



static int __init initcall_blacklist(char *str)
{
	pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
prarit bhargavaprarit bhargava19100.00%1100.00%


Total19100.00%1100.00%






static bool __init_or_module initcall_blacklisted(initcall_t fn)
{
	return false;
}

Contributors
PersonTokensPropCommitsCommitProp
prarit bhargavaprarit bhargava13100.00%1100.00%


Total13100.00%1100.00%



#endif
__setup("initcall_blacklist=", initcall_blacklist);




static int __init_or_module do_one_initcall_debug(initcall_t fn)
{
	ktime_t calltime, delta, rettime;
	unsigned long long duration;
	int ret;

	printk(KERN_DEBUG "calling  %pF @ %i\n", fn, task_pid_nr(current));
	calltime = ktime_get();
	ret = fn();
	rettime = ktime_get();
	delta = ktime_sub(rettime, calltime);
	duration = (unsigned long long) ktime_to_ns(delta) >> 10;
	printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n",
		 fn, ret, duration);

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
ingo molnaringo molnar2628.57%15.88%


frederic weisbeckerfrederic weisbecker2123.08%317.65%


americo wangamerico wang1314.29%15.88%


andrew mortonandrew morton99.89%423.53%


kevin winchesterkevin winchester66.59%211.76%


pre-gitpre-git55.49%15.88%


linus torvaldslinus torvalds44.40%15.88%


will newtonwill newton33.30%15.88%


arjan van de venarjan van de ven33.30%211.76%


tim birdtim bird11.10%15.88%


Total91100.00%17100.00%






int __init_or_module do_one_initcall(initcall_t fn)
{
	int count = preempt_count();
	int ret;
	char msgbuf[64];

	if (initcall_blacklisted(fn))
		return -EPERM;

	if (initcall_debug)
		ret = do_one_initcall_debug(fn);
	else
		ret = fn();

	msgbuf[0] = 0;

	if (preempt_count() != count) {
		sprintf(msgbuf, "preemption imbalance ");
		preempt_count_set(count);
	}
	if (irqs_disabled()) {
		strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
		local_irq_enable();
	}
	WARN(msgbuf[0], "initcall %pF returned with %s\n", fn, msgbuf);

	add_latent_entropy();
	return ret;
}



Contributors
PersonTokensPropCommitsCommitProp
kevin winchesterkevin winchester3427.87%211.11%


cyrill gorcunovcyrill gorcunov2822.95%211.11%


andrew mortonandrew morton2218.03%211.11%


prarit bhargavaprarit bhargava119.02%15.56%


steven rostedtsteven rostedt108.20%316.67%


pre-gitpre-git43.28%15.56%


peter zijlstrapeter zijlstra32.46%15.56%


emese revfyemese revfy32.46%15.56%


ingo molnaringo molnar21.64%15.56%


linus torvaldslinus torvalds21.64%211.11%


arjan van de venarjan van de ven21.64%15.56%


frederic weisbeckerfrederic weisbecker10.82%15.56%


Total122100.00%18100.00%



extern initcall_t __initcall_start[];
extern initcall_t __initcall0_start[];
extern initcall_t __initcall1_start[];
extern initcall_t __initcall2_start[];
extern initcall_t __initcall3_start[];
extern initcall_t __initcall4_start[];
extern initcall_t __initcall5_start[];
extern initcall_t __initcall6_start[];
extern initcall_t __initcall7_start[];
extern initcall_t __initcall_end[];


static initcall_t *initcall_levels[] __initdata = {
	__initcall0_start,
	__initcall1_start,
	__initcall2_start,
	__initcall3_start,
	__initcall4_start,
	__initcall5_start,
	__initcall6_start,
	__initcall7_start,
	__initcall_end,
};

/* Keep these in sync with initcalls in include/linux/init.h */

static char *initcall_level_names[] __initdata = {
	"early",
	"core",
	"postcore",
	"arch",
	"subsys",
	"fs",
	"device",
	"late",
};




static void __init do_initcall_level(int level)
{
	initcall_t *fn;

	strcpy(initcall_command_line, saved_command_line);
	parse_args(initcall_level_names[level],
		   initcall_command_line, __start___param,
		   __stop___param - __start___param,
		   level, level,
		   NULL, &repair_env_string);

	for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
		do_one_initcall(*fn);
}


Contributors
PersonTokensPropCommitsCommitProp
pawel mollpawel moll4257.53%112.50%


linus torvaldslinus torvalds1926.03%112.50%


h hartley sweetenh hartley sweeten56.85%112.50%


krzysztof mazurkrzysztof mazur22.74%112.50%


luis r. rodriguezluis r. rodriguez22.74%112.50%


chris metcalfchris metcalf11.37%112.50%


pre-gitpre-git11.37%112.50%


jim cromiejim cromie11.37%112.50%


Total73100.00%8100.00%






static void __init do_initcalls(void)
{
	int level;

	for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
		do_initcall_level(level);
}


Contributors
PersonTokensPropCommitsCommitProp
pawel mollpawel moll35100.00%1100.00%


Total35100.00%1100.00%



/*
 * Ok, the machine is now initialized. None of the devices
 * have been touched yet, but the CPU subsystem is up and
 * running, and memory and process management works.
 *
 * Now we can finally start doing some real work..
 */



static void __init do_basic_setup(void)
{
	cpuset_init_smp();
	shmem_init();
	driver_init();
	init_irq_proc();
	do_ctors();
	usermodehelper_enable();
	do_initcalls();
	random_int_secret_init();
}


Contributors
PersonTokensPropCommitsCommitProp
pre-gitpre-git824.24%323.08%


linus torvaldslinus torvalds515.15%215.38%


theodore tsotheodore tso39.09%17.69%


lai jiangshanlai jiangshan39.09%17.69%


eric w. biedermaneric w. biederman39.09%17.69%


peter oberparleiterpeter oberparleiter39.09%17.69%


patrick mochelpatrick mochel39.09%17.69%


wang yanqingwang yanqing26.06%17.69%


kay sieverskay sievers26.06%17.69%


hugh dickinshugh dickins13.03%17.69%


Total33100.00%13100.00%






static void __init do_pre_smp_initcalls(void)
{
	initcall_t *fn;

	for (fn = __initcall_start; fn < __initcall0_start; fn++)
		do_one_initcall(*fn);
}


Contributors
PersonTokensPropCommitsCommitProp
eduard gabriel munteanueduard gabriel munteanu2681.25%250.00%


h hartley sweetenh hartley sweeten515.62%125.00%


pawel mollpawel moll13.12%125.00%


Total32100.00%4100.00%



/*
 * This function requests modules which should be loaded by default and is
 * called twice right after initrd is mounted and right before init is
 * exec'd.  If such modules are on either initrd or rootfs, they will be
 * loaded before control is passed to userland.
 */



void __init load_default_modules(void)
{
	load_default_elevator_module();
}


Contributors
PersonTokensPropCommitsCommitProp
tejun heotejun heo11100.00%1100.00%


Total11100.00%1100.00%






static int run_init_process(const char *init_filename)
{
	argv_init[0] = init_filename;
	return do_execve(getname_kernel(init_filename),
		(const char __user *const __user *)argv_init,
		(const char __user *const __user *)envp_init);
}


Contributors
PersonTokensPropCommitsCommitProp
andrew mortonandrew morton2346.94%120.00%


al viroal viro2244.90%240.00%


linus torvaldslinus torvalds36.12%120.00%


david howellsdavid howells12.04%120.00%


Total49100.00%5100.00%






static int try_to_run_init_process(const char *init_filename)
{
	int ret;

	ret = run_init_process(init_filename);

	if (ret && ret != -ENOENT) {
		pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
		       init_filename, ret);
	}

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
michael opdenackermichael opdenacker44100.00%1100.00%


Total44100.00%1100.00%



static noinline void __init kernel_init_freeable(void);

#ifdef CONFIG_DEBUG_RODATA

static bool rodata_enabled = true;



static int __init set_debug_rodata(char *str)
{
	return strtobool(str, &rodata_enabled);
}

Contributors
PersonTokensPropCommitsCommitProp
kees cookkees cook20100.00%1100.00%


Total20100.00%1100.00%



__setup("rodata=", set_debug_rodata);




static void mark_readonly(void)
{
	if (rodata_enabled)
		mark_rodata_ro();
	else
		pr_info("Kernel memory protection disabled.\n");
}

Contributors
PersonTokensPropCommitsCommitProp
kees cookkees cook21100.00%1100.00%


Total21100.00%1100.00%



#else



static inline void mark_readonly(void)
{
	pr_warn("This architecture does not have kernel memory protection.\n");
}

Contributors
PersonTokensPropCommitsCommitProp
kees cookkees cook14100.00%1100.00%


Total14100.00%1100.00%



#endif




static int __ref kernel_init(void *unused)
{
	int ret;

	kernel_init_freeable();
	/* need to finish all async __init code before freeing the memory */
	async_synchronize_full();
	free_initmem();
	mark_readonly();
	system_state = SYSTEM_RUNNING;
	numa_default_policy();

	flush_delayed_fput();

	rcu_end_inkernel_boot();

	if (ramdisk_execute_command) {
		ret = run_init_process(ramdisk_execute_command);
		if (!ret)
			return 0;
		pr_err("Failed to execute %s (error %d)\n",
		       ramdisk_execute_command, ret);
	}

	/*
         * We try each of these until one succeeds.
         *
         * The Bourne shell can be used instead of init if we are
         * trying to recover a really broken machine.
         */
	if (execute_command) {
		ret = run_init_process(execute_command);
		if (!ret)
			return 0;
		panic("Requested init %s failed (error %d).",
		      execute_command, ret);
	}
	if (!try_to_run_init_process("/sbin/init") ||
	    !try_to_run_init_process("/etc/init") ||
	    !try_to_run_init_process("/bin/init") ||
	    !try_to_run_init_process("/bin/sh"))
		return 0;

	panic("No working init found.  Try passing init= option to kernel. "
	      "See Linux Documentation/init.txt for guidance.");
}


Contributors
PersonTokensPropCommitsCommitProp
pre-gitpre-git3223.53%1136.67%


al viroal viro3122.79%310.00%


michael opdenackermichael opdenacker2518.38%13.33%


olof johanssonolof johansson1511.03%13.33%


andy lutomirskiandy lutomirski96.62%13.33%


arjan van de venarjan van de ven64.41%26.67%


andrew mortonandrew morton42.94%310.00%


paul e. mckenneypaul e. mckenney32.21%13.33%


andi kleenandi kleen32.21%13.33%


brain averybrain avery21.47%13.33%


linus torvaldslinus torvalds21.47%13.33%


andreas mohrandreas mohr10.74%13.33%


kees cookkees cook10.74%13.33%


rakib mullickrakib mullick10.74%13.33%


vivek goyalvivek goyal10.74%13.33%


Total136100.00%30100.00%






static noinline void __init kernel_init_freeable(void)
{
	/*
         * Wait until kthreadd is all set-up.
         */
	wait_for_completion(&kthreadd_done);

	/* Now the scheduler is fully set up and can do blocking allocations */
	gfp_allowed_mask = __GFP_BITS_MASK;

	/*
         * init can allocate pages on any node
         */
	set_mems_allowed(node_states[N_MEMORY]);
	/*
         * init can run on any cpu.
         */
	set_cpus_allowed_ptr(current, cpu_all_mask);

	cad_pid = task_pid(current);

	smp_prepare_cpus(setup_max_cpus);

	do_pre_smp_initcalls();
	lockup_detector_init();

	smp_init();
	sched_init_smp();

	page_alloc_init_late();

	do_basic_setup();

	/* Open the /dev/console on the rootfs, this should never fail */
	if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
		pr_err("Warning: unable to open an initial console.\n");

	(void) sys_dup(0);
	(void) sys_dup(0);
	/*
         * check if there is an early userspace init.  If yes, let it do all
         * the work
         */

	if (!ramdisk_execute_command)
		ramdisk_execute_command = "/init";

	if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) {
		ramdisk_execute_command = NULL;
		prepare_namespace();
	}

	/*
         * Ok, we have completed the initial bootup, and
         * we're essentially up and running. Get rid of the
         * initmem segments and start the user-mode stuff..
         *
         * rootfs is available now, try loading the public keys
         * and default modules
         */

	integrity_load_keys();
	load_default_modules();
}

Contributors
PersonTokensPropCommitsCommitProp
vivek goyalvivek goyal7247.06%15.88%


eric w. biedermaneric w. biederman4026.14%15.88%


peter zijlstrapeter zijlstra106.54%211.76%


miao xiemiao xie85.23%211.76%


linus torvaldslinus torvalds53.27%15.88%


dmitry kasatkindmitry kasatkin42.61%15.88%


mel gormanmel gorman31.96%15.88%


tejun heotejun heo31.96%15.88%


al viroal viro21.31%15.88%


vineet guptavineet gupta10.65%15.88%


andi kleenandi kleen10.65%15.88%


rusty russellrusty russell10.65%15.88%


mike travismike travis10.65%15.88%


andrew mortonandrew morton10.65%15.88%


lai jiangshanlai jiangshan10.65%15.88%


Total153100.00%17100.00%




Overall Contributors
PersonTokensPropCommitsCommitProp
pre-gitpre-git39711.68%6719.76%


rusty russellrusty russell36510.74%164.72%


andrew mortonandrew morton34910.27%319.14%


prarit bhargavaprarit bhargava2477.27%20.59%


pawel mollpawel moll1705.00%10.29%


linus torvaldslinus torvalds1233.62%175.01%


vivek goyalvivek goyal982.88%20.59%


kees cookkees cook762.24%10.29%


al viroal viro752.21%51.47%


alon bar-levalon bar-lev702.06%10.29%


olof johanssonolof johansson702.06%10.29%


michael opdenackermichael opdenacker692.03%10.29%


eric w. biedermaneric w. biederman682.00%30.88%


ingo molnaringo molnar641.88%92.65%


pekka j enbergpekka j enberg461.35%41.18%


peter oberparleiterpeter oberparleiter441.29%10.29%


kevin winchesterkevin winchester401.18%20.59%


tejun heotejun heo401.18%51.47%


yinghai luyinghai lu371.09%41.18%


peter zijlstrapeter zijlstra330.97%61.77%


rasmus villemoesrasmus villemoes300.88%20.59%


steven rostedtsteven rostedt290.85%51.47%


chris metcalfchris metcalf290.85%10.29%


frederic weisbeckerfrederic weisbecker280.82%41.18%


cyrill gorcunovcyrill gorcunov280.82%20.59%


luis r. rodriguezluis r. rodriguez280.82%10.29%


thomas gleixnerthomas gleixner280.82%82.36%


eduard gabriel munteanueduard gabriel munteanu270.79%20.59%


matthias kunzematthias kunze260.76%10.29%


david howellsdavid howells250.74%51.47%


magnus dammmagnus damm240.71%10.29%


americo wangamerico wang210.62%20.59%


jim cromiejim cromie200.59%20.59%


geert uytterhoevengeert uytterhoeven200.59%20.59%


krzysztof mazurkrzysztof mazur190.56%10.29%


dmitry torokhovdmitry torokhov190.56%10.29%


william lee irwin iiiwilliam lee irwin iii180.53%10.29%


alexander sverdlinalexander sverdlin170.50%10.29%


andi kleenandi kleen170.50%41.18%


arjan van de venarjan van de ven170.50%41.18%


mike travismike travis160.47%30.88%


heiko carstensheiko carstens150.44%10.29%


h hartley sweetenh hartley sweeten140.41%10.29%


benjamin herrenschmidtbenjamin herrenschmidt140.41%30.88%


len brownlen brown140.41%20.59%


paul e. mckenneypaul e. mckenney130.38%41.18%


josh triplettjosh triplett120.35%20.59%


adrian bunkadrian bunk120.35%41.18%


shailabh nagarshailabh nagar120.35%20.59%


greg kroah-hartmangreg kroah-hartman120.35%20.59%


jan beulichjan beulich100.29%20.59%


hannes frederic sowahannes frederic sowa100.29%10.29%


santosh shilimkarsantosh shilimkar90.26%10.29%


andy lutomirskiandy lutomirski90.26%10.29%


ard van breemenard van breemen90.26%10.29%


john stultzjohn stultz90.26%20.59%


h. peter anvinh. peter anvin90.26%20.59%


arnaldo carvalho de meloarnaldo carvalho de melo80.24%10.29%


paul menagepaul menage80.24%10.29%


miao xiemiao xie80.24%20.59%


catalin marinascatalin marinas70.21%20.59%


joonsoo kimjoonsoo kim70.21%10.29%


dmitry kasatkindmitry kasatkin70.21%10.29%


matt flemingmatt fleming60.18%10.29%


theodore tsotheodore tso60.18%10.29%


aaron tomlinaaron tomlin60.18%10.29%


feng tangfeng tang60.18%10.29%


stephen boydstephen boyd60.18%10.29%


jason wesseljason wessel60.18%20.59%


rafael j. wysockirafael j. wysocki60.18%20.59%


toshi kanitoshi kani60.18%10.29%


yaowei baiyaowei bai60.18%10.29%


fabian frederickfabian frederick60.18%20.59%


dipankar sarmadipankar sarma60.18%10.29%


paul jacksonpaul jackson50.15%10.29%


john levonjohn levon50.15%10.29%


kay sieverskay sievers50.15%10.29%


daniel thompsondaniel thompson40.12%10.29%


pavel emelianovpavel emelianov40.12%10.29%


nick pigginnick piggin40.12%20.59%


geliang tanggeliang tang40.12%10.29%


mel gormanmel gorman40.12%20.59%


stas sergeevstas sergeev40.12%10.29%


lai jiangshanlai jiangshan40.12%20.59%


tetsuo handatetsuo handa40.12%10.29%


akinobu mitaakinobu mita30.09%10.29%


russell kingrussell king30.09%10.29%


alex riesenalex riesen30.09%20.59%


will newtonwill newton30.09%10.29%


stephane eranianstephane eranian30.09%10.29%


hannes reineckehannes reinecke30.09%10.29%


christoph hellwigchristoph hellwig30.09%10.29%


lei minglei ming30.09%10.29%


yang shiyang shi30.09%10.29%


randy dunlaprandy dunlap30.09%10.29%


haicheng lihaicheng li30.09%10.29%


takao indohtakao indoh30.09%10.29%


jens axboejens axboe30.09%10.29%


vegard nossumvegard nossum30.09%10.29%


emese revfyemese revfy30.09%10.29%


christoph lameterchristoph lameter30.09%10.29%


sukadev bhattiprolusukadev bhattiprolu30.09%10.29%


petr mladekpetr mladek30.09%10.29%


patrick mochelpatrick mochel30.09%10.29%


jeremy fitzhardingejeremy fitzhardinge30.09%10.29%


heinrich schuchardtheinrich schuchardt20.06%10.29%


brain averybrain avery20.06%10.29%


wang yanqingwang yanqing20.06%10.29%


jiang liujiang liu20.06%10.29%


rakib mullickrakib mullick20.06%10.29%


vineet guptavineet gupta20.06%10.29%


paolo  giarrussopaolo  giarrusso20.06%10.29%


adam kropelinadam kropelin20.06%10.29%


sam ravnborgsam ravnborg20.06%10.29%


li zefanli zefan20.06%10.29%


chris wrightchris wright20.06%20.59%


borislav petkovborislav petkov20.06%10.29%


michal schmidtmichal schmidt20.06%10.29%


andreas mohrandreas mohr10.03%10.29%


hugh dickinshugh dickins10.03%10.29%


kirill a. shutemovkirill a. shutemov10.03%10.29%


tim birdtim bird10.03%10.29%


frans klaverfrans klaver10.03%10.29%


namhyung kimnamhyung kim0.00%00.00%


Total3399100.00%339100.00%

  
Directory: init