linux-kernel - Re: [PATCH] kfence: fix implicit function declaration

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Date:   Fri, 4 Dec 2020 13:29:01 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Marco Elver <elver@...gle.com>,
        Dmitriy Vyukov <dvyukov@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kfence: fix implicit function declaration

On Fri, Dec 4, 2020 at 1:18 PM Anders Roxell <anders.roxell@...aro.org> wrote:
>
> When building kfence the following error shows up:
>
> In file included from mm/kfence/report.c:13:
> arch/arm64/include/asm/kfence.h: In function ‘kfence_protect_page’:
> arch/arm64/include/asm/kfence.h:12:2: error: implicit declaration of function ‘set_memory_valid’ [-Werror=implicit-function-declaration]
>    12 |  set_memory_valid(addr, 1, !protect);
>       |  ^~~~~~~~~~~~~~~~
>
> Use the correct include both
> f2b7c491916d ("set_memory: allow querying whether set_direct_map_*() is actually enabled")
> and 4c4c75881536 ("arm64, kfence: enable KFENCE for ARM64") went in the
> same day via different trees.
>
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
Reviewed-by: Alexander Potapenko <glider@...gle.com>


Thanks!

> ---
>
> I got this build error in todays next-20201204.
> Andrew, since both patches are in your -mm tree, I think this can be
> folded into 4c4c75881536 ("arm64, kfence: enable KFENCE for ARM64")
>
>  arch/arm64/include/asm/kfence.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/include/asm/kfence.h b/arch/arm64/include/asm/kfence.h
> index 6c0afeeab635..c44bb368a810 100644
> --- a/arch/arm64/include/asm/kfence.h
> +++ b/arch/arm64/include/asm/kfence.h
> @@ -3,7 +3,7 @@
>  #ifndef __ASM_KFENCE_H
>  #define __ASM_KFENCE_H
>
> -#include <asm/cacheflush.h>
> +#include <asm/set_memory.h>
>
>  static inline bool arch_kfence_init_pool(void) { return true; }
>
> --
> 2.29.2
>


-- 
Alexander Potapenko
Software Engineer

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