linux-kernel - Re: [PATCH] linux/export.h: remove unneeded .balign directive

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Message-ID: <CA+icZUVyTm=xGWd77f2D8xxcsH+1rXm7YaW==u1i=MVDfZ-+TQ@mail.gmail.com>
Date: Fri, 5 Jan 2024 09:20:57 +0100
From: Sedat Dilek <sedat.dilek@...il.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Helge Deller <deller@....de>
Subject: Re: [PATCH] linux/export.h: remove unneeded .balign directive

On Thu, Jan 4, 2024 at 3:17 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Thu, Jan 4, 2024 at 1:05 AM Sedat Dilek <sedat.dilek@...il.com> wrote:
> >
> > Happy new 2024 Masahiro,
> >
> > some small nits.
> >
> > What about adding links to the commits...
> >
> > linux/export: Fix alignment for 64-bit ksymtab entries
> > [ Upstream commit f6847807c22f6944c71c981b630b9fff30801e73 ]
> >
> > linux/export: Ensure natural alignment of kcrctab array
> > [ Upstream commit 753547de0daecbdbd1af3618987ddade325d9aaa ]
> >
> > ^^ AFAICS in linux-stable - v6.6.10-rc1 includes both
> > ^^ Is yours a follow-up and makes sense for linux-stable releases?
>
>
> No.
>
> This patch is a separate clean-up, not a bug fix.
>
> No need for back-porting.
>

Thanks for the clarification.

But it is an improvement - so no discarding at link-time means
reduction of build-time?
Amy numbers?

>
>
>
> >
> > ...and CC Helge Deller?
>

CC in the patch - makes for me only sense if you agree on adding above
commit-ids of Helge's work.
I think this is good in sense of follow-able references.

Best regards,
-Sedat-

>
> You did it.
>
>
> Thanks.
>
>
>
>
>
> > Best regards,
> > -Sedat-
> >
> > Link: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/log/?h=linux-6.6.y
> >
> > On Wed, Jan 3, 2024 at 2:55 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
> > >
> > > The .export_symbol section is discarded by the linker script, hence
> > > no alignment is needed. Simplify the code.
> > >
> > > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > > ---
> > >
> > >  include/linux/export.h | 10 +++-------
> > >  1 file changed, 3 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/include/linux/export.h b/include/linux/export.h
> > > index 0bbd02fd351d..dff230bb5aca 100644
> > > --- a/include/linux/export.h
> > > +++ b/include/linux/export.h
> > > @@ -15,13 +15,9 @@
> > >   */
> > >
> > >  #ifdef CONFIG_64BIT
> > > -#define __EXPORT_SYMBOL_REF(sym)                       \
> > > -       .balign 8                               ASM_NL  \
> > > -       .quad sym
> > > +#define __EXPORT_SYMBOL_PTR    .quad
> > >  #else
> > > -#define __EXPORT_SYMBOL_REF(sym)                       \
> > > -       .balign 4                               ASM_NL  \
> > > -       .long sym
> > > +#define __EXPORT_SYMBOL_PTR    .long
> > >  #endif
> > >
> > >  #define ___EXPORT_SYMBOL(sym, license, ns)             \
> > > @@ -29,7 +25,7 @@
> > >         __export_symbol_##sym:                  ASM_NL  \
> > >                 .asciz license                  ASM_NL  \
> > >                 .asciz ns                       ASM_NL  \
> > > -               __EXPORT_SYMBOL_REF(sym)        ASM_NL  \
> > > +               __EXPORT_SYMBOL_PTR sym         ASM_NL  \
> > >         .previous
> > >
> > >  #if defined(__DISABLE_EXPORTS)
> > > --
> > > 2.40.1
> > >
> > >
> >
>
>
> --
> Best Regards
> Masahiro Yamada