linux-kernel - Re: [PATCH] ARM: vdso: use $(LD) instead of $(CC) to link VDSO

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Date:   Fri, 12 Apr 2019 10:29:02 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH] ARM: vdso: use $(LD) instead of $(CC) to link VDSO

On Thu, Apr 11, 2019 at 2:30 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> My plan is to rewrite all VDSO Makefiles to use $(LD), then delete
> cc-ldoption.

I too look forward to the removal of cc-ldoption. Thanks for the
patch.  Based on some of the discussion in a similar patch for
aarch64: https://lkml.org/lkml/2019/4/12/760:
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
>
>  arch/arm/vdso/Makefile | 21 ++++++++-------------
>  1 file changed, 8 insertions(+), 13 deletions(-)
>
> diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile
> index f4efff9d3afb..fadf554d9391 100644
> --- a/arch/arm/vdso/Makefile
> +++ b/arch/arm/vdso/Makefile
> @@ -10,12 +10,12 @@ obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
>  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 += -nostdlib -shared
> -VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
> -VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--build-id)
> -VDSO_LDFLAGS += $(call cc-ldoption, -fuse-ld=bfd)
> +ldflags-y = -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
> +           -z max-page-size=4096 -z common-page-size=4096 \

This reminds me that I should resend:
https://lore.kernel.org/patchwork/patch/1023578/

-- 
Thanks,
~Nick Desaulniers