linux-kernel - Re: [PATCH] mm/shmem: Inline shmem_is_huge() for disabled transparent hugepages

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Date: Wed, 10 Apr 2024 14:34:35 +0200
From: David Hildenbrand <david@...hat.com>
To: Sumanth Korikkar <sumanthk@...ux.ibm.com>, akpm@...ux-foundation.org,
 linux-mm@...ck.org
Cc: hughd@...gle.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
 agordeev@...ux.ibm.com, iii@...ux.ibm.com, linux-s390@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/shmem: Inline shmem_is_huge() for disabled transparent
 hugepages

On 09.04.24 17:54, Sumanth Korikkar wrote:
> In order to  minimize code size (CONFIG_CC_OPTIMIZE_FOR_SIZE=y),
> compiler might choose to make a regular function call (out-of-line) for
> shmem_is_huge() instead of inlining it. When transparent hugepages are
> disabled (CONFIG_TRANSPARENT_HUGEPAGE=n), it can cause compilation
> error.
> 
> mm/shmem.c: In function ‘shmem_getattr’:
> ./include/linux/huge_mm.h:383:27: note: in expansion of macro ‘BUILD_BUG’
>    383 | #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
>        |                           ^~~~~~~~~
> mm/shmem.c:1148:33: note: in expansion of macro ‘HPAGE_PMD_SIZE’
>   1148 |                 stat->blksize = HPAGE_PMD_SIZE;
> 
> To prevent the possible error, always inline shmem_is_huge() when
> transparent hugepages are disabled.
> 

Do you know which commit introduced that?

-- 
Cheers,

David / dhildenb