linux-kernel - Re: [PATCH] LoongArch: Mark __xchg() and __cmpxchg() as __always

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Date:   Mon, 10 Oct 2022 14:04:52 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Huacai Chen" <chenhuacai@...ngson.cn>,
        "Huacai Chen" <chenhuacai@...nel.org>
Cc:     loongarch@...ts.linux.dev, Linux-Arch <linux-arch@...r.kernel.org>,
        "Xuefeng Li" <lixuefeng@...ngson.cn>, guoren <guoren@...nel.org>,
        "WANG Xuerui" <kernel@...0n.name>,
        "Jiaxun Yang" <jiaxun.yang@...goat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] LoongArch: Mark __xchg() and __cmpxchg() as __always_inline

On Mon, Oct 10, 2022, at 1:56 PM, Huacai Chen wrote:
> Commit ac7c3e4ff401 ("compiler: enable CONFIG_OPTIMIZE_INLINING
> forcibly") allows compiler to uninline functions marked as 'inline'.
> In case of __xchg()/__cmpxchg() this would cause to reference
> BUILD_BUG(), which is an error case for catching bugs and will not
> happen for correct code, if __xchg()/__cmpxchg() is inlined.
>
> This bug can be produced with CONFIG_DEBUG_SECTION_MISMATCH enabled,
> and the solution is similar to below commits:
> 46f1619500d0225 ("MIPS: include: Mark __xchg as __always_inline"),
> 88356d09904bc60 ("MIPS: include: Mark __cmpxchg as __always_inline").
>
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>

Looks good to me,

Acked-by: Arnd Bergmann <arnd@...db.de>