linux-kernel - Re: [PATCH v3] xtensa: improve vmlinux.lds.S sed post-processing

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Message-ID: <CAP6Y9+-esf7e-8wCTS6dJRWA_H-t_jo6p72AAw9pKKA8=1KYcA@mail.gmail.com>
Date:	Fri, 21 Aug 2015 11:22:59 -0700
From:	Chris Zankel <chris@...kel.net>
To:	Max Filippov <jcmvbkbc@...il.com>
Cc:	"linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
	Marc Gauthier <marc@...ence.com>,
	Guenter Roeck <linux@...ck-us.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] xtensa: improve vmlinux.lds.S sed post-processing

Thanks Max. Running a test build and will add to xtensa-next.

On Fri, Aug 21, 2015 at 10:43 AM, Max Filippov <jcmvbkbc@...il.com> wrote:
> Current sed script makes assumptions about the structure of rules that
> group .text sections in the vmlinux linker script. These assumptions
> get broken occasionally, e.g.: 779c88c94c34 "ARM: 8321/1: asm-generic:
> introduce.text.fixup input section", or 9bebe9e5b0f3 "kbuild: Fix
> .text.unlikely placement".
>
> Rewrite sed rules so that they don't depend on number/arrangement of text
> sections in *(...) blocks.
>
> Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
> ---
> This fixes breakage in the linux-next. Chris, could you please apply it to
> your for_next branch?
>
> Changes v2 -> v3:
> - rebase to the current master
>
> Changes v1 -> v2:
> - don't change arbitrary sections containing .text, only .text, .ref.text
>   and .[a-z]*it.text
>
>  arch/xtensa/kernel/Makefile | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile
> index d3a0f0f..ad93217 100644
> --- a/arch/xtensa/kernel/Makefile
> +++ b/arch/xtensa/kernel/Makefile
> @@ -27,10 +27,11 @@ AFLAGS_head.o += -mtext-section-literals
>  #
>  # Replicate rules in scripts/Makefile.build
>
> -sed-y = -e 's/\*(\(\.[a-z]*it\|\.ref\|\)\.text)/*(\1.literal \1.text)/g' \
> -       -e 's/\.text\.unlikely/.literal.unlikely .text.unlikely/g'       \
> -       -e 's/\*(\(\.text .*\))/*(.literal \1)/g'                        \
> -       -e 's/\*(\(\.text\.[a-z]*\))/*(\1.literal \1)/g'
> +sed-y = -e ':a; s/\*(\([^)]*\)\.text\.unlikely/*(\1.literal.unlikely .{text}.unlikely/; ta; ' \
> +       -e ':b; s/\*(\([^)]*\)\.text\(\.[a-z]*\)/*(\1.{text}\2.literal .{text}\2/; tb; ' \
> +       -e ':c; s/\*(\([^)]*\)\(\.[a-z]*it\|\.ref\)\.text/*(\1\2.literal \2.{text}/; tc; ' \
> +       -e ':d; s/\*(\([^)]\+ \|\)\.text/*(\1.literal .{text}/; td; ' \
> +       -e 's/\.{text}/.text/g'
>
>  quiet_cmd__cpp_lds_S = LDS     $@
>  cmd__cpp_lds_S = $(CPP) $(cpp_flags) -P -C -Uxtensa -D__ASSEMBLY__ $<    \
> --
> 1.8.1.4
>
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