litmus-rt.git - The LITMUS^RT kernel.

diff options

author	Len Brown <len.brown@intel.com>	2009-12-24 01:19:00 -0500
committer	Len Brown <len.brown@intel.com>	2009-12-24 01:19:00 -0500
commit	fcb11235d3910c39afece52f6e106a9ca565d34b (patch)
tree	07412f9c367f5f9bf6ad7ccd6fa8146c4aba68af /kernel/sysctl_binary.c
parent	78a5331dddcffabadef024ccc051f7a519b13238 (diff)
parent	44ef00e6482e755f36629773abc2aee83a6f53e3 (diff)

Merge branch 'misc-2.6.33' into release

Diffstat (limited to 'kernel/sysctl_binary.c')

0 files changed, 0 insertions, 0 deletions

#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 *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_key_slow_dec(work->key); kfree(work); } static void once_disable_jump(struct static_key *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); } 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; } EXPORT_SYMBOL(__do_once_start); void __do_once_done(bool *done, struct static_key *once_key, unsigned long *flags) __releases(once_lock) { *done = true; spin_unlock_irqrestore(&once_lock, *flags); once_disable_jump(once_key); } EXPORT_SYMBOL(__do_once_done);


context:
space:
mode: