From: "PaX Team" <pageexec@freemail.hu>
To: x86@kernel.org
Date: Wed, 08 Jan 2014 13:04:51 +0100
MIME-Version: 1.0
Subject: Re: [llvmlinux] [PATCH 4/4] x86, boot: Work around clang PR18415.
Reply-to: pageexec@freemail.hu
CC: llvmlinux@lists.linuxfoundation.org, linux-kernel@vger.kernel.org
Message-ID: <52CD3EE3.6295.92E23548@pageexec.freemail.hu>
In-reply-to: <1389180083-23249-4-git-send-email-David.Woodhouse@intel.com>
References: <1389180083-23249-1-git-send-email-David.Woodhouse@intel.com>, <1389180083-23249-4-git-send-email-David.Woodhouse@intel.com>
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7BIT
Content-description: Mail message body
Sender: linux-kernel-owner@vger.kernel.org

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/