On Fri, Feb 14, 2014 at 10:21:25PM +0100, Andi Kleen wrote:
> From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
>
> 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@xxxxxxxxxx
> Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> ---
> 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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