cregit-Linux how code gets into the kernel

Release 4.15 lib/once.c

Directory: lib
// SPDX-License-Identifier: GPL-2.0
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/once.h>
#include <linux/random.h>


struct once_work {
	
struct work_struct work;
	
struct static_key_true *key;
};


static void once_deferred(struct work_struct *w) { struct once_work *work; work = container_of(w, struct once_work, work); BUG_ON(!static_key_enabled(work->key)); static_branch_disable(work->key); kfree(work); }

Contributors

PersonTokensPropCommitsCommitProp
Hannes Frederic Sowa5098.04%266.67%
Eric Biggers11.96%133.33%
Total51100.00%3100.00%


static void once_disable_jump(struct static_key_true *key) { struct once_work *w; w = kmalloc(sizeof(*w), GFP_ATOMIC); if (!w) return; INIT_WORK(&w->work, once_deferred); w->key = key; schedule_work(&w->work); }

Contributors

PersonTokensPropCommitsCommitProp
Hannes Frederic Sowa5898.31%266.67%
Eric Biggers11.69%133.33%
Total59100.00%3100.00%

static DEFINE_SPINLOCK(once_lock);
bool __do_once_start(bool *done, unsigned long *flags) __acquires(once_lock) { spin_lock_irqsave(&once_lock, *flags); if (*done) { spin_unlock_irqrestore(&once_lock, *flags); /* Keep sparse happy by restoring an even lock count on * this lock. In case we return here, we don't call into * __do_once_done but return early in the DO_ONCE() macro. */ __acquire(once_lock); return false; } return true; }

Contributors

PersonTokensPropCommitsCommitProp
Hannes Frederic Sowa55100.00%2100.00%
Total55100.00%2100.00%

EXPORT_SYMBOL(__do_once_start);
void __do_once_done(bool *done, struct static_key_true *once_key, unsigned long *flags) __releases(once_lock) { *done = true; spin_unlock_irqrestore(&once_lock, *flags); once_disable_jump(once_key); }

Contributors

PersonTokensPropCommitsCommitProp
Hannes Frederic Sowa4197.62%266.67%
Eric Biggers12.38%133.33%
Total42100.00%3100.00%

EXPORT_SYMBOL(__do_once_done);

Overall Contributors

PersonTokensPropCommitsCommitProp
Hannes Frederic Sowa24598.00%250.00%
Eric Biggers41.60%125.00%
Greg Kroah-Hartman10.40%125.00%
Total250100.00%4100.00%
Directory: lib
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.