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Message-ID: <a85b21a6-e1f6-4b46-9eb7-c1d687888e16@linuxfoundation.org>
Date: Mon, 21 Oct 2024 10:32:16 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: David Laight <David.Laight@...LAB.COM>,
"'Liam R. Howlett'" <Liam.Howlett@...cle.com>
Cc: "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"vbabka@...e.cz" <vbabka@...e.cz>,
"sidhartha.kumar@...cle.com" <sidhartha.kumar@...cle.com>,
"lorenzo.stoakes@...cle.com" <lorenzo.stoakes@...cle.com>,
"zhangpeng.00@...edance.com" <zhangpeng.00@...edance.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] tools: fix -Wunused-result in linux.c
On 10/21/24 10:10, David Laight wrote:
> From: Liam R. Howlett
>> Sent: 15 October 2024 02:11
>>
>> * Shuah Khan <skhan@...uxfoundation.org> [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@...uxfoundation.org>
>>
>> Reviewed-by: Liam R. Howlett <Liam.Howlett@...cle.com>
>>
>>> ---
>>> 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 :-)
Yes you are right. I will spin another version to cover
the malloc and I just noticed another posix_memalign()
with -Wunused-result that compiler didn't flag in
kmem_cache_alloc_bulk() to fix as well in the next version.
thanks,
-- Shuah
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