linux-kernel - Re: [PATCH] riscv: Explicitly specify the build id style in vDSO Makefile again

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Message-ID: <CAKwvOd=P2yFxkAXh9TUpJ=D5=jNnxnx7O5Nr3iTDeqV40UA19A@mail.gmail.com>
Date:   Thu, 12 Nov 2020 16:53:14 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Palmer Dabbelt <palmerdabbelt@...gle.com>,
        linux-riscv@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Bill Wendling <morbo@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [PATCH] riscv: Explicitly specify the build id style in vDSO
 Makefile again

On Sun, Nov 8, 2020 at 12:37 PM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> Commit a96843372331 ("kbuild: explicitly specify the build id style")
> explicitly set the build ID style to SHA1. Commit c2c81bb2f691 ("RISC-V:
> Fix the VDSO symbol generaton for binutils-2.35+") undid this change,
> likely unintentionally.
>
> Restore it so that the build ID style stays consistent across the tree
> regardless of linker.
>
> Fixes: c2c81bb2f691 ("RISC-V: Fix the VDSO symbol generaton for binutils-2.35+")
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Thanks for the fixup!

Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

(I'm curious what --build-id linker flag does, and what kind of spooky
bugs that led to a96843372331?)

> ---
>  arch/riscv/kernel/vdso/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
> index cb8f9e4cfcbf..0cfd6da784f8 100644
> --- a/arch/riscv/kernel/vdso/Makefile
> +++ b/arch/riscv/kernel/vdso/Makefile
> @@ -44,7 +44,7 @@ SYSCFLAGS_vdso.so.dbg = $(c_flags)
>  $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) FORCE
>         $(call if_changed,vdsold)
>  SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \
> -       -Wl,--build-id -Wl,--hash-style=both
> +       -Wl,--build-id=sha1 -Wl,--hash-style=both
>
>  # We also create a special relocatable object that should mirror the symbol
>  # table and layout of the linked DSO. With ld --just-symbols we can then
>
> base-commit: c2c81bb2f69138f902e1a58d3bef6ad97fb8a92c
> --
> 2.29.2
>
> --
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-- 
Thanks,
~Nick Desaulniers