linux-kernel - Re: next-20201105 - build issue with KASAN on ARM

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Date:   Sat, 7 Nov 2020 13:04:53 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Valdis Klētnieks <valdis.kletnieks@...edu>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-next@...r.kernel.org
Subject: Re: next-20201105 - build issue with KASAN on ARM

Hi Valdis,

On Sat, Nov 07, 2020 at 01:33:20PM -0500, Valdis Klētnieks wrote:
> commit d6d51a96c7d63b7450860a3037f2d62388286a52
> Author: Linus Walleij <linus.walleij@...aro.org>
> Date:   Sun Oct 25 23:52:08 2020 +0100
> 
>     ARM: 9014/2: Replace string mem* functions for KASan
> 
> I'm trying to figure out why this has 3 Tested-By: tags but blows up for fairly obvious
> reasons on ARM.....

Because it builds fine if you check out Russell's branch. This build
error only happens because of a treewide change in -mm that was applied
after the ARM merge:

https://lore.kernel.org/linux-arm-kernel/20201106094434.GA3268933@ubuntu-m3-large-x86/

https://lore.kernel.org/linux-arm-kernel/20201106180929.GD2959494@ubuntu-m3-large-x86/

Stephen could apply that diff as a fixup for the -mm patch when he
builds -next or I can send it as a formal patch for him to apply.

>   CC      arch/arm/boot/compressed/string.o
> arch/arm/boot/compressed/string.c:24:1: error: attribute 'alias' argument not a string
>  void *__memcpy(void *__dest, __const void *__src, size_t __n) __alias(memcpy);
>  ^~~~
> arch/arm/boot/compressed/string.c:25:1: error: attribute 'alias' argument not a string
>  void *__memmove(void *__dest, __const void *__src, size_t count) __alias(memmove);
>  ^~~~
> arch/arm/boot/compressed/string.c:26:1: error: attribute 'alias' argument not a string
>  void *__memset(void *s, int c, size_t count) __alias(memset);
>  ^~~~
> make[2]: *** [scripts/Makefile.build:283: arch/arm/boot/compressed/string.o] Error 1
> make[1]: *** [arch/arm/boot/Makefile:64: arch/arm/boot/compressed/vmlinux] Error 2
> 

Cheers,
Nathan