linux-kernel - Re: [llvmlinux] [PATCH 4/4] x86, boot: Work around clang PR18415.

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Date:	Wed, 08 Jan 2014 13:04:51 +0100
From:	"PaX Team" <pageexec@...email.hu>
To:	x86@...nel.org
CC:	llvmlinux@...ts.linuxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [llvmlinux] [PATCH 4/4] x86, boot: Work around clang PR18415.

On 8 Jan 2014 at 11:21, David Woodhouse wrote:

> Clang's intrinsics ignore -mregparm=3 when they fall back to calling the
> out-of-line implementations. Putting the args on the stack when memcpy()
> expects them in registers is not a recipe for a happy kernel.
> 
> This bites with -m32 too, so clang is presumably catastrophically
> broken for the i386 kernel until this is fixed, unless I'm missing
> something.

llvmlinux already carries my old patch (and some more) here:
 arch/i586/patches/0026-Add-own-versions-of-memcpy-and-memset-for-compilatio.patch

(see also my comment on the clang PR)

cheers,
 PaX Team

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