linux-kernel - Re: [PATCH] [v2] mm: shmem: avoid build warning for CONFIG

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Message-ID: <aTFoqq034LYPPDEz@kernel.org>
Date: Thu, 4 Dec 2025 12:55:38 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pratyush Yadav <pratyush@...nel.org>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	Arnd Bergmann <arnd@...db.de>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Kairui Song <kasong@...cent.com>,
	David Hildenbrand <david@...nel.org>,
	Christian Brauner <brauner@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Kemeng Shi <shikemeng@...weicloud.com>,
	Guo Weikang <guoweikang.kernel@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] mm: shmem: avoid build warning for CONFIG_SHMEM=n

On Thu, Dec 04, 2025 at 11:28:59AM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The newly added 'flags' variable is unused and causes a warning if
> CONFIG_SHMEM is disabled, since the shmem_acct_size() macro it is passed
> into does nothing:
> 
> mm/shmem.c: In function '__shmem_file_setup':
> mm/shmem.c:5816:23: error: unused variable 'flags' [-Werror=unused-variable]
>  5816 |         unsigned long flags = (vm_flags & VM_NORESERVE) ? SHMEM_F_NORESERVE : 0;
>       |                       ^~~~~
> 
> Replace the two macros with equivalent inline functions tto get the
> argument checking.
> 
> Fixes: 6ff1610ced56 ("mm: shmem: use SHMEM_F_* flags instead of VM_* flags")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

> ---
> v2: make shmem_unacct_size() inline as well.

-- 
Sincerely yours,
Mike.