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

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

[ndesaulniers]

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@google.com>
---
 arch/arm/vdso/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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

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

[Nick Desaulniers]

On Mon, Dec 10, 2018 at 2:32 PM <ndesaulniers@google.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@google.com>
> ---
>  arch/arm/vdso/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> 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
>

Bumping for review.  This option has been removed from all other architectures.

-- 
Thanks,
~Nick Desaulniers

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

[Arnd Bergmann]

On Mon, Dec 10, 2018 at 11:32 PM <ndesaulniers@google.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@google.com>
> ---

The patch looks good to me,

Acked-by: Arnd Bergmann <arnd@arndb.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@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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

[Nathan Lynch]

Arnd Bergmann <arnd@arndb.de> writes:
> On Mon, Dec 10, 2018 at 11:32 PM <ndesaulniers@google.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@google.com>
>> ---
>
> The patch looks good to me,
>
> Acked-by: Arnd Bergmann <arnd@arndb.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.

Thanks for cc'ing me -- no objection.

Acked-by: Nathan Lynch <nathanl@linux.ibm.com>

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

[Nick Desaulniers]

On Wed, Apr 24, 2019 at 6:45 AM Nathan Lynch <nathanl@linux.ibm.com> wrote:
> Arnd Bergmann <arnd@arndb.de> writes:
> > Acked-by: Arnd Bergmann <arnd@arndb.de>
> Acked-by: Nathan Lynch <nathanl@linux.ibm.com>

https://www.armlinux.org.uk/developer/patches/viewpatch.php?id=8859/1
-- 
Thanks,
~Nick Desaulniers