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| author | John Stultz <john.stultz@linaro.org> | 2014-06-04 16:11:39 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-04 16:54:17 -0700 |
| commit | 81954606265ab8f04b41154bd00576013affcf5b (patch) | |
| tree | f320a8b4fb80586184c9dcba1974275f7aeca56d /kernel/printk | |
| parent | 458df9fd4815b47809875d57f42e16401674b621 (diff) | |
| download | kernel-common-81954606265ab8f04b41154bd00576013affcf5b.tar.gz kernel-common-81954606265ab8f04b41154bd00576013affcf5b.tar.bz2 kernel-common-81954606265ab8f04b41154bd00576013affcf5b.zip | |
printk: disable preemption for printk_sched
An earlier change in -mm (printk: remove separate printk_sched
buffers...), removed the printk_sched irqsave/restore lines since it was
safe for current users. Since we may be expanding usage of
printk_sched(), disable preepmtion for this function to make it more
generally safe to call.
Signed-off-by: John Stultz <john.stultz@linaro.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/printk')
| -rw-r--r-- | kernel/printk/printk.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 247b0c1fadfc..dc2b8bd9bc1e 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -2590,12 +2590,14 @@ int printk_sched(const char *fmt, ...) va_list args; int r; + preempt_disable(); va_start(args, fmt); r = vprintk_emit(0, SCHED_MESSAGE_LOGLEVEL, NULL, 0, fmt, args); va_end(args); __this_cpu_or(printk_pending, PRINTK_PENDING_OUTPUT); irq_work_queue(&__get_cpu_var(wake_up_klogd_work)); + preempt_enable(); return r; } |