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1f8a763309
"struct task_struct"->state is "volatile long" and __ffs() warns that "Undefined if no bit exists, so code should check against 0 first." Therefore, at expression state = p->state ? __ffs(p->state) + 1 : 0; in sched_show_task(), CPU might see "p->state" before "?" as "non-zero" but "p->state" after "?" as "zero", which could result in "state >= sizeof(stat_nam)" being true and bogus '?' is printed. This patch changes "state" from "unsigned int" to "unsigned long" and save "p->state" before calling __ffs(), in order to avoid potential call to __ffs(0). Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/201412052131.GCE35924.FVHFOtLOJOMQFS@I-love.SAKURA.ne.jp Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| .. | ||
| auto_group.c | ||
| auto_group.h | ||
| clock.c | ||
| completion.c | ||
| core.c | ||
| cpuacct.c | ||
| cpuacct.h | ||
| cpudeadline.c | ||
| cpudeadline.h | ||
| cpupri.c | ||
| cpupri.h | ||
| cputime.c | ||
| deadline.c | ||
| debug.c | ||
| fair.c | ||
| features.h | ||
| idle_task.c | ||
| idle.c | ||
| Makefile | ||
| proc.c | ||
| rt.c | ||
| sched.h | ||
| stats.c | ||
| stats.h | ||
| stop_task.c | ||
| wait.c | ||