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| author | Nathan Chancellor <natechancellor@gmail.com> | 2019-12-05 01:50:50 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-12-05 04:44:12 +0100 |
| commit | ef70eff9dea66f38f8c2c2dcc7fe4b7a2bbb4921 (patch) | |
| tree | 61e800bf59d883c5f4e9954351dd4d6907f3c2f7 /kernel | |
| parent | kernel/notifier.c: remove blocking_notifier_chain_cond_register() (diff) | |
| download | linux-ef70eff9dea66f38f8c2c2dcc7fe4b7a2bbb4921.tar.xz linux-ef70eff9dea66f38f8c2c2dcc7fe4b7a2bbb4921.zip | |
kernel/profile.c: use cpumask_available to check for NULL cpumask
When building with clang + -Wtautological-pointer-compare, these
instances pop up:
kernel/profile.c:339:6: warning: comparison of array 'prof_cpu_mask' not equal to a null pointer is always true [-Wtautological-pointer-compare]
if (prof_cpu_mask != NULL)
^~~~~~~~~~~~~ ~~~~
kernel/profile.c:376:6: warning: comparison of array 'prof_cpu_mask' not equal to a null pointer is always true [-Wtautological-pointer-compare]
if (prof_cpu_mask != NULL)
^~~~~~~~~~~~~ ~~~~
kernel/profile.c:406:26: warning: comparison of array 'prof_cpu_mask' not equal to a null pointer is always true [-Wtautological-pointer-compare]
if (!user_mode(regs) && prof_cpu_mask != NULL &&
^~~~~~~~~~~~~ ~~~~
3 warnings generated.
This can be addressed with the cpumask_available helper, introduced in
commit f7e30f01a9e2 ("cpumask: Add helper cpumask_available()") to fix
warnings like this while keeping the code the same.
Link: https://github.com/ClangBuiltLinux/linux/issues/747
Link: http://lkml.kernel.org/r/20191022191957.9554-1-natechancellor@gmail.com
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/profile.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/profile.c b/kernel/profile.c index af7c94bf5fa1..4b144b02ca5d 100644 --- a/kernel/profile.c +++ b/kernel/profile.c @@ -336,7 +336,7 @@ static int profile_dead_cpu(unsigned int cpu) struct page *page; int i; - if (prof_cpu_mask != NULL) + if (cpumask_available(prof_cpu_mask)) cpumask_clear_cpu(cpu, prof_cpu_mask); for (i = 0; i < 2; i++) { @@ -373,7 +373,7 @@ static int profile_prepare_cpu(unsigned int cpu) static int profile_online_cpu(unsigned int cpu) { - if (prof_cpu_mask != NULL) + if (cpumask_available(prof_cpu_mask)) cpumask_set_cpu(cpu, prof_cpu_mask); return 0; @@ -403,7 +403,7 @@ void profile_tick(int type) { struct pt_regs *regs = get_irq_regs(); - if (!user_mode(regs) && prof_cpu_mask != NULL && + if (!user_mode(regs) && cpumask_available(prof_cpu_mask) && cpumask_test_cpu(smp_processor_id(), prof_cpu_mask)) profile_hit(type, (void *)profile_pc(regs)); } |