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

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Date:	Wed, 30 Sep 2015 08:55:54 +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 8:59 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> 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 ?
>

What about...?

"x86, efi, kasan: Fix error implicit declaration of memcpy"

"x86, efi, kasan: Add missing CONFIG_KASAN check for #undef
memset/memcpy/memmove"

- Sedat -

> - 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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