RE: [PATCH] tools: fix -Wunused-result in linux.c
From: David Laight
Date: Mon Oct 21 2024 - 12:10:31 EST
From: Liam R. Howlett
> Sent: 15 October 2024 02:11
>
> * Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> [241011 18:52]:
> > Fix the following -Wunused-result warnings on posix_memalign()
> > return values and add error handling.
> >
> > ./shared/linux.c:100:25: warning: ignoring return value of ‘posix_memalign’ declared with attribute
> ‘warn_unused_result’ [-Wunused-result]
> > 100 | posix_memalign(&p, cachep->align, cachep->size);
> > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > ../shared/linux.c: In function ‘kmem_cache_alloc_bulk’:
> > ../shared/linux.c:198:33: warning: ignoring return value of ‘posix_memalign’ declared with attribute
> ‘warn_unused_result’ [-Wunused-result]
> > 198 | posix_memalign(&p[i], cachep->align,
> > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > 199 | cachep->size);
> > | ~~~~~~~~~~~~~
> >
> > Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
>
> Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
>
> > ---
> > tools/testing/shared/linux.c | 14 +++++++++-----
> > 1 file changed, 9 insertions(+), 5 deletions(-)
> >
> > diff --git a/tools/testing/shared/linux.c b/tools/testing/shared/linux.c
> > index 17263696b5d8..66dbb362385f 100644
> > --- a/tools/testing/shared/linux.c
> > +++ b/tools/testing/shared/linux.c
> > @@ -96,10 +96,13 @@ void *kmem_cache_alloc_lru(struct kmem_cache *cachep, struct list_lru *lru,
> > p = node;
> > } else {
> > pthread_mutex_unlock(&cachep->lock);
> > - if (cachep->align)
> > - posix_memalign(&p, cachep->align, cachep->size);
> > - else
> > + if (cachep->align) {
> > + if (posix_memalign(&p, cachep->align, cachep->size) < 0)
> > + return NULL;
> > + } else {
> > p = malloc(cachep->size);
> > + }
> > +
You really ought to be checking malloc() as well.
Perhaps:
if (...) {
if (posix_memalign(...) < 0)
p = NULL;
} else {
p = malloc(...);
}
if (!p)
return NULL;
Or just use a hack to get the compiler to STFU :-)
David
-
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