linux-kernel - Re: [PATCH] treewide: Convert macro and uses of __section(foo) to _

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Date:   Mon, 26 Oct 2020 12:41:27 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Joe Perches <joe@...ches.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] treewide: Convert macro and uses of __section(foo) to
 __section("foo")

On Wed, Oct 21, 2020 at 07:36:07PM -0700, Joe Perches wrote:
> Use a more generic form for __section that requires quotes to avoid
> complications with clang and gcc differences.
> 
> Remove the quote operator # from compiler_attributes.h __section macro.
> 
> Convert all unquoted __section(foo) uses to quoted __section("foo").
> Also convert __attribute__((section("foo"))) uses to __section("foo")
> even if the __attribute__ has multiple list entry forms.
> 
> Conversion done using a script:
> 
> Link: https://lore.kernel.org/lkml/75393e5ddc272dc7403de74d645e6c6e0f4e70eb.camel@perches.com/2-convert_section.pl
> 
> Signed-off-by: Joe Perches <joe@...ches.com>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...ogle.com>
> Reviewed-by: Miguel Ojeda <ojeda@...nel.org>
> ---
> 
make ARCH=um SUBARCH=x86_64 defconfig:

Building um:defconfig ... failed
--------------
Error log:
arch/um/kernel/skas/clone.c:24:16: error: expected declaration specifiers or '...' before string constant
   24 | void __section(".__syscall_stub")
      |                ^~~~~~~~~~~~~~~~~
make[3]: *** [arch/um/kernel/skas/clone.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [arch/um/kernel/skas] Error 2
make[2]: *** Waiting for unfinished jobs....
arch/um/os-Linux/signal.c: In function 'sig_handler_common':
arch/um/os-Linux/signal.c:51:1: warning: the frame size of 2960 bytes is larger than 1024 bytes [-Wframe-larger-than=]
   51 | }
      | ^
arch/um/os-Linux/signal.c: In function 'timer_real_alarm_handler':
arch/um/os-Linux/signal.c:95:1: warning: the frame size of 2960 bytes is larger than 1024 bytes [-Wframe-larger-than=]
   95 | }
      | ^
make[1]: *** [arch/um/kernel] Error 2
make[1]: *** Waiting for unfinished jobs....
arch/x86/um/stub_segv.c:11:16: error: expected declaration specifiers or '...' before string constant
   11 | void __section(".__syscall_stub")
      |                ^~~~~~~~~~~~~~~~~
make[2]: *** [arch/x86/um/stub_segv.o] Error 1
make[1]: *** [arch/x86/um] Error 2
make: *** [__sub-make] Error 2

As with s390, reverting this patch fixes the problem.

Guenter