linux-kernel - Re: [PATCH 01/19] x86, lto: Disable LTO for the x86 VDSO

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Message-ID: <20140215212628.GB27575@ravnborg.org>
Date:	Sat, 15 Feb 2014 22:26:28 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-kbuild@...r.kernel.org, mmarek@...e.cz,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 01/19] x86, lto: Disable LTO for the x86 VDSO

On Fri, Feb 14, 2014 at 10:21:25PM +0100, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> The VDSO does not play well with LTO, so just disable LTO for it.
> Also pass a 32bit linker flag for the 32bit version.
> 
> Cc: x86@...nel.org
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  arch/x86/vdso/Makefile | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/vdso/Makefile b/arch/x86/vdso/Makefile
> index fd14be1..598f163 100644
> --- a/arch/x86/vdso/Makefile
> +++ b/arch/x86/vdso/Makefile
> @@ -2,6 +2,8 @@
>  # Building vDSO images for x86.
>  #
>  
> +KBUILD_CFLAGS += ${DISABLE_LTO}
> +
In kbuild files $() is usally preferred.

	Sam
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