linux-kernel - Re: [PATCH] x86: fix build failure

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Message-ID: <CA+icZUUOwm6R_H9MQpRfqU9VBofBhoucxGV4qABDJPxUFKXbRA@mail.gmail.com>
Date:	Tue, 29 Sep 2015 20:59:15 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: fix build failure

On Tue, Sep 29, 2015 at 6:40 PM, Andrey Ryabinin <ryabinin.a.a@...il.com> wrote:
> With KMEMCHECK=y, KASAN=n:
>
> arch/x86/platform/efi/efi.c:673:3: error: implicit declaration of function ‘memcpy’ [-Werror=implicit-function-declaration]
> arch/x86/platform/efi/efi_64.c:139:2: error: implicit declaration of function ‘memcpy’ [-Werror=implicit-function-declaration]
> arch/x86/include/asm/desc.h:121:2: error: implicit declaration of function ‘memcpy’ [-Werror=implicit-function-declaration]
>
> Don't #undef memcpy if KASAN=n.
>

Good catch.
This broke my llvmlinux-patches Linux v4.3-rcN.

The subject-line is not very meaningful - to me at least ?

- Sedat -

> Reported-by: Ingo Molnar <mingo@...nel.org>
> Reported-by: Sedat Dilek <sedat.dilek@...il.com>
> Fixes: 769a8089c1fd ("x86, efi, kasan: #undef memset/memcpy/memmove per arch")
> Signed-off-by: Andrey Ryabinin <ryabinin.a.a@...il.com>
> ---
>  arch/x86/include/asm/efi.h | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
> index ab5f1d4..ae68be9 100644
> --- a/arch/x86/include/asm/efi.h
> +++ b/arch/x86/include/asm/efi.h
> @@ -86,6 +86,7 @@ extern u64 asmlinkage efi_call(void *fp, ...);
>  extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
>                                         u32 type, u64 attribute);
>
> +#ifdef CONFIG_KASAN
>  /*
>   * CONFIG_KASAN may redefine memset to __memset.  __memset function is present
>   * only in kernel binary.  Since the EFI stub linked into a separate binary it
> @@ -95,6 +96,7 @@ extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
>  #undef memcpy
>  #undef memset
>  #undef memmove
> +#endif
>
>  #endif /* CONFIG_X86_32 */
>
> --
> 2.4.6
>
--
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