linux-kernel - Re: [PATCHv5 4/4] arm64: Add build salt to the vDSO

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Date:   Wed, 4 Jul 2018 12:55:35 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Mark Wielaard <mjw@...oraproject.org>,
        "H . J . Lu" <hjl.tools@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        X86 ML <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nick Clifton <nickc@...hat.com>,
        Cary Coutant <ccoutant@...il.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCHv5 4/4] arm64: Add build salt to the vDSO

Hi.

2018-07-04 8:34 GMT+09:00 Laura Abbott <labbott@...hat.com>:
>
> The vDSO needs to have a unique build id in a similar manner
> to the kernel and modules. Use the build salt macro.
>
> Signed-off-by: Laura Abbott <labbott@...hat.com>
> ---
> v5: I was previously focused on x86 only but since powerpc gave a patch,
> I figured I would do arm64 since the changes were also fairly simple.
> ---
>  arch/arm64/kernel/vdso/note.S | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm64/kernel/vdso/note.S b/arch/arm64/kernel/vdso/note.S
> index b82c85e5d972..2c429dfd3f45 100644
> --- a/arch/arm64/kernel/vdso/note.S
> +++ b/arch/arm64/kernel/vdso/note.S
> @@ -22,7 +22,10 @@
>  #include <linux/uts.h>
>  #include <linux/version.h>
>  #include <linux/elfnote.h>
> +#include <linux/build-salt.h>
>
>  ELFNOTE_START(Linux, 0, "a")
>         .long LINUX_VERSION_CODE
>  ELFNOTE_END
> +
> +BUILD_SALT;



I think this works, but
I prefer no-semicolon in assembly files.

For coding consistency,
I want ';' as statement delimiter in .c files.
But, only new line after each statement in .S files.

For example, in arch/x86/xen/xen-head.S
I see no semicolon after ELFNOTE().

I found this:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0473k/dom1359731141352.html
It says ';' starts a comment line
although it is not the case of GAS.


Same for 3/4.



-- 
Best Regards
Masahiro Yamada