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author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-16 15:17:40 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-16 15:17:40 -0700 |
commit | e533b227055598b1f7dc8503a3b4f36b14b9da8a (patch) | |
tree | 28fec4125eac45c8e2fac75b3d10ff5cd987d2f6 /kernel/printk.c | |
parent | 0999d978dcdcf59350dafa25afd70def9f924eee (diff) | |
parent | 6b2ada82101a08e2830fb29d7dc9b858be637dd4 (diff) | |
download | kernel_samsung_smdk4412-e533b227055598b1f7dc8503a3b4f36b14b9da8a.zip kernel_samsung_smdk4412-e533b227055598b1f7dc8503a3b4f36b14b9da8a.tar.gz kernel_samsung_smdk4412-e533b227055598b1f7dc8503a3b4f36b14b9da8a.tar.bz2 |
Merge branch 'core-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
do_generic_file_read: s/EINTR/EIO/ if lock_page_killable() fails
softirq, warning fix: correct a format to avoid a warning
softirqs, debug: preemption check
x86, pci-hotplug, calgary / rio: fix EBDA ioremap()
IO resources, x86: ioremap sanity check to catch mapping requests exceeding, fix
IO resources, x86: ioremap sanity check to catch mapping requests exceeding the BAR sizes
softlockup: Documentation/sysctl/kernel.txt: fix softlockup_thresh description
dmi scan: warn about too early calls to dmi_check_system()
generic: redefine resource_size_t as phys_addr_t
generic: make PFN_PHYS explicitly return phys_addr_t
generic: add phys_addr_t for holding physical addresses
softirq: allocate less vectors
IO resources: fix/remove printk
printk: robustify printk, update comment
printk: robustify printk, fix #2
printk: robustify printk, fix
printk: robustify printk
Fixed up conflicts in:
arch/powerpc/include/asm/types.h
arch/powerpc/platforms/Kconfig.cputype
manually.
Diffstat (limited to 'kernel/printk.c')
-rw-r--r-- | kernel/printk.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/kernel/printk.c b/kernel/printk.c index fbd94bd..6341af7 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -577,9 +577,6 @@ static int have_callable_console(void) * @fmt: format string * * This is printk(). It can be called from any context. We want it to work. - * Be aware of the fact that if oops_in_progress is not set, we might try to - * wake klogd up which could deadlock on runqueue lock if printk() is called - * from scheduler code. * * We try to grab the console_sem. If we succeed, it's easy - we log the output and * call the console drivers. If we fail to get the semaphore we place the output @@ -984,10 +981,25 @@ int is_console_locked(void) return console_locked; } -void wake_up_klogd(void) +static DEFINE_PER_CPU(int, printk_pending); + +void printk_tick(void) { - if (!oops_in_progress && waitqueue_active(&log_wait)) + if (__get_cpu_var(printk_pending)) { + __get_cpu_var(printk_pending) = 0; wake_up_interruptible(&log_wait); + } +} + +int printk_needs_cpu(int cpu) +{ + return per_cpu(printk_pending, cpu); +} + +void wake_up_klogd(void) +{ + if (waitqueue_active(&log_wait)) + __raw_get_cpu_var(printk_pending) = 1; } /** |