cregit-Linux how code gets into the kernel

Release 4.7 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; }

Contributors

PersonTokensPropCommitsCommitProp
vivek goyalvivek goyal18100.00%1100.00%
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; }

Contributors

PersonTokensPropCommitsCommitProp
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; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git1688.89%133.33%
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; }

Contributors

PersonTokensPropCommitsCommitProp
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; }

Contributors

PersonTokensPropCommitsCommitProp
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; }

Contributors

PersonTokensPropCommitsCommitProp
rusty russellrusty russell6260.78%220.00%
pre-gitpre-git1514.71%440.00%
len brownlen brown1110.78%110.00%
chris metcalfchris metcalf54.90%110.00%
jim cromiejim cromie54.90%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; }

Contributors

PersonTokensPropCommitsCommitProp
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; }

Contributors

PersonTokensPropCommitsCommitProp
rusty russellrusty russell8040.40%212.50%
pre-gitpre-git4321.72%850.00%
andrew mortonandrew morton2110.61%16.25%
chris metcalfchris metcalf2110.61%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; }

Contributors

PersonTokensPropCommitsCommitProp
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; }

Contributors

PersonTokensPropCommitsCommitProp
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) { }

Contributors

PersonTokensPropCommitsCommitProp
mike travismike travis8100.00%1100.00%
Total8100.00%1100.00%


static inline void smp_prepare_cpus(unsigned int maxcpus) { }

Contributors

PersonTokensPropCommitsCommitProp
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); }

Contributors

PersonTokensPropCommitsCommitProp
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 __init_refok 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); }

Contributors

PersonTokensPropCommitsCommitProp
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%
sam ravnborgsam ravnborg22.53%211.11%
andrew mortonandrew morton22.53%211.11%
nick pigginnick piggin11.27%15.56%
rakib mullickrakib mullick11.27%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; }

Contributors

PersonTokensPropCommitsCommitProp
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%
michal schmidtmichal schmidt10.93%114.29%
rusty russellrusty russell10.93%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); }

Contributors

PersonTokensPropCommitsCommitProp
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; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton4191.11%125.00%
fabian frederickfabian frederick24.44%125.00%
magnus dammmagnus damm12.22%125.00%
alon bar-levalon bar-lev12.22%125.00%
Total45100.00%4100.00%


void __init __weak smp_setup_processor_id(void) { }

Contributors

PersonTokensPropCommitsCommitProp
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) { }

Contributors

PersonTokensPropCommitsCommitProp
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(); }

Contributors

PersonTokensPropCommitsCommitProp
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%
h. peter anvinh. peter anvin91.78%21.50%
john stultzjohn stultz91.78%21.50%
ard van breemenard van breemen91.78%10.75%
tejun heotejun heo81.58%21.50%
alon bar-levalon bar-lev71.38%10.75%
mike travismike travis71.38%21.50%
yinghai luyinghai lu71.38%21.50%
shailabh nagarshailabh nagar61.19%21.50%
matt flemingmatt fleming61.19%10.75%
rafael j. wysockirafael j. wysocki61.19%21.50%
aaron tomlinaaron tomlin61.19%10.75%
david howellsdavid howells61.19%21.50%
paul menagepaul menage50.99%10.75%
catalin marinascatalin marinas40.79%21.50%
andi kleenandi kleen40.79%21.50%
daniel thompsondaniel thompson40.79%10.75%
luis r. rodriguezluis r. rodriguez40.79%10.75%
stas sergeevstas sergeev40.79%10.75%
frederic weisbeckerfrederic weisbecker30.59%10.75%
christoph lameterchristoph lameter30.59%10.75%
petr mladekpetr mladek30.59%10.75%
stephane eranianstephane eranian30.59%10.75%
jeremy fitzhardingejeremy fitzhardinge30.59%10.75%
dipankar sarmadipankar sarma30.59%10.75%
stephen boydstephen boyd30.59%10.75%
peter zijlstrapeter zijlstra30.59%10.75%
al viroal viro30.59%10.75%
haicheng lihaicheng li30.59%10.75%
lei minglei ming30.59%10.75%
jason wesseljason wessel30.59%21.50%
feng tangfeng tang30.59%10.75%
takao indohtakao indoh30.59%10.75%
yang shiyang shi30.59%10.75%
alex riesenalex riesen20.40%10.75%
tetsuo handatetsuo handa20.40%10.75%
greg kroah-hartmangreg kroah-hartman20.40%10.75%
fabian frederickfabian frederick20.40%10.75%
chris wrightchris wright20.40%21.50%
john levonjohn levon20.40%10.75%
jiang liujiang liu20.40%10.75%
benjamin herrenschmidtbenjamin herrenschmidt20.40%10.75%
li zefanli zefan20.40%10.75%
paul jacksonpaul jackson20.40%10.75%
pawel mollpawel moll20.40%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); 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 bhargava5762.64%125.00%
rasmus villemoesrasmus villemoes3032.97%250.00%
geliang tanggeliang tang44.40%125.00%
Total91100.00%4100.00%

#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); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
kevin winchesterkevin winchester3428.57%211.76%
cyrill gorcunovcyrill gorcunov2823.53%211.76%
andrew mortonandrew morton2218.49%211.76%
prarit bhargavaprarit bhargava119.24%15.88%
steven rostedtsteven rostedt108.40%317.65%
pre-gitpre-git43.36%15.88%
peter zijlstrapeter zijlstra32.52%15.88%
linus torvaldslinus torvalds21.68%211.76%
ingo molnaringo molnar21.68%15.88%
arjan van de venarjan van de ven21.68%15.88%
frederic weisbeckerfrederic weisbecker10.84%15.88%
Total119100.00%17100.00%

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(