linux-kernel - Re: [PATCH] ARM: VDSO: Drop implicit common-page-size linker flag

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Date:   Wed, 24 Apr 2019 09:29:23 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Mark Rutland <mark.rutland@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Nathan Lynch <nathanl@...ux.ibm.com>
Subject: Re: [PATCH] ARM: VDSO: Drop implicit common-page-size linker flag

On Mon, Dec 10, 2018 at 11:32 PM <ndesaulniers@...gle.com> wrote:
>
> GNU linker's -z common-page-size's default value is based on the target
> architecture. arch/arm/vdso/Makefile sets it to the architecture
> default, which is implicit and redundant. Drop it.
>
> Link: https://lkml.kernel.org/r/20181206191231.192355-1-ndesaulniers@google.com
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---

The patch looks good to me,

Acked-by: Arnd Bergmann <arnd@...db.de>

Adding Nathan Lynch to Cc though for further comments, he originally
added the Makefile flags here and might still remember why he did it.

Unless Nathan objects, please add the patch to Russell's patch tracker.

> diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile
> index f4efff9d3afb..8f2fac5acbc8 100644
> --- a/arch/arm/vdso/Makefile
> +++ b/arch/arm/vdso/Makefile
> @@ -11,7 +11,7 @@ ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
>  ccflags-y += -DDISABLE_BRANCH_PROFILING
>
>  VDSO_LDFLAGS := -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1
> -VDSO_LDFLAGS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
> +VDSO_LDFLAGS += -Wl,-z,max-page-size=4096
>  VDSO_LDFLAGS += -nostdlib -shared
>  VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
>  VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--build-id)
> --
> 2.20.0.rc2.403.gdbc3b29805-goog
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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