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| author |   Yafang Shao <laoar.shao@gmail.com> | 2018-11-21 19:12:14 +0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-11-23 07:58:23 +0100 |
| commit | 6e662ae7bce6db602f79e57791f5fb887fb7d371 (patch) | |
| tree | b44e95083122c4cac2d6665e7eb1804843068c36 /arch/x86/kernel/process.c | |
| parent | x86/traps: Complete prototype declarations (diff) | |
| download | linux-dev-6e662ae7bce6db602f79e57791f5fb887fb7d371.tar.xz linux-dev-6e662ae7bce6db602f79e57791f5fb887fb7d371.zip | |
x86/process: Avoid unnecessary NULL check in get_wchan()
Task 'p' is always guaranteed to be non-NULL, because the only call
sites are in fs/proc/ which all guarantee a non-NULL task pointer.
[ mingo: Improved the changelog. ]
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1542798734-12532-1-git-send-email-laoar.shao@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/process.c')
| -rw-r--r-- | arch/x86/kernel/process.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index c93fcfdf1673..3c3ee8982577 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -730,7 +730,7 @@ unsigned long get_wchan(struct task_struct *p) unsigned long start, bottom, top, sp, fp, ip, ret = 0; int count = 0; - if (!p || p == current || p->state == TASK_RUNNING) + if (p == current || p->state == TASK_RUNNING) return 0; if (!try_get_task_stack(p)) |