linux-kernel - Re: [PATCH 1/2] x86/purgatory: add -mno-sse, -mno-mmx, -mno-sse2 to Makefile

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Date:   Thu, 18 Jul 2019 09:47:05 +0900
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Vaibhav Rustagi <vaibhavrustagi@...gle.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Vivek Goyal <vgoyal@...hat.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH 1/2] x86/purgatory: add -mno-sse, -mno-mmx, -mno-sse2 to
 Makefile

On Wed, Jul 17, 2019 at 05:02:05PM -0700, Vaibhav Rustagi wrote:
> Compiling the purgatory code with clang results in using of mmx
> registers.
> 
> $ objdump -d arch/x86/purgatory/purgatory.ro | grep xmm
> 
>      112:	0f 28 00             	movaps (%rax),%xmm0
>      115:	0f 11 07             	movups %xmm0,(%rdi)
>      122:	0f 28 00             	movaps (%rax),%xmm0
>      125:	0f 11 47 10          	movups %xmm0,0x10(%rdi)
> 
> Add -mno-sse, -mno-mmx, -mno-sse2 to avoid generating SSE instructions.
> 
> Signed-off-by: Vaibhav Rustagi <vaibhavrustagi@...gle.com>
> ---
>  arch/x86/purgatory/Makefile | 1 +
>  1 file changed, 1 insertion(+)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>