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authorYafang Shao <laoar.shao@gmail.com>2018-11-21 19:12:14 +0800
committerIngo Molnar <mingo@kernel.org>2018-11-23 07:58:23 +0100
commit6e662ae7bce6db602f79e57791f5fb887fb7d371 (patch)
treeb44e95083122c4cac2d6665e7eb1804843068c36 /arch
parent8e1599fcac2efda8b7d433ef69d2492f0b351e3f (diff)
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')
-rw-r--r--arch/x86/kernel/process.c2
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))