linux-kernel - Re: [PATCH v3] mm, slub: change run-time assertion in kmalloc

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Date:   Tue, 18 May 2021 09:38:59 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Vlastimil Babka <vbabka@...e.cz>, akpm@...ux-foundation.org,
        iamjoonsoo.kim@....com, rientjes@...gle.com, penberg@...nel.org,
        cl@...ux.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        naresh.kamboju@...aro.org, clang-built-linux@...glegroups.com,
        linux-next@...r.kernel.org, ndesaulniers@...gle.com,
        lkft-triage@...ts.linaro.org, sfr@...b.auug.org.au, arnd@...db.de,
        Marco Elver <elver@...gle.com>
Subject: Re: [PATCH v3] mm, slub: change run-time assertion in
 kmalloc_index() to compile-time

On Sat, May 15, 2021 at 11:34:49PM -0700, Nathan Chancellor wrote:
> This should work I think:

compiled well with clang-10.0.1, clang-11.0.0,
and gcc-10.2.0 with x86_64 default config.

is the condition CONFIG_CLANG_VERSION > 110000,
not including 110000 it self?

> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index 9d316aac0aba..1b653266f2aa 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -413,7 +413,7 @@ static __always_inline unsigned int __kmalloc_index(size_t size,
>  	if (size <=  16 * 1024 * 1024) return 24;
>  	if (size <=  32 * 1024 * 1024) return 25;
>  
> -	if (size_is_constant)
> +	if ((IS_ENABLED(CONFIG_CC_IS_GCC) || CONFIG_CLANG_VERSION > 110000) && size_is_constant)
>  		BUILD_BUG_ON_MSG(1, "unexpected size in kmalloc_index()");
>  	else
>  		BUG();