linux-kernel - Re: [PATCH] ftrace: Allow section alignment

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Message-Id: <1226063896.2697.28.camel@twins>
Date:	Fri, 07 Nov 2008 14:18:16 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Matt Fleming <mjf@...too.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, mingo@...e.hu,
	rostedt@...dmis.org
Subject: Re: [PATCH] ftrace: Allow section alignment

On Fri, 2008-11-07 at 13:12 +0000, Matt Fleming wrote:
> Provide a means of aligning the __mcount_loc section.

Not that I object to the patch, but this changelog needs work.

Its wrong, it doesn't provide means, it plain does.
It doesn't tell us why.

> Signed-off-by: Matt Fleming <matthew.fleming@...tec.com>
> ---
>  scripts/recordmcount.pl |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
> index 6b9fe3e..2d0bfa1 100755
> --- a/scripts/recordmcount.pl
> +++ b/scripts/recordmcount.pl
> @@ -134,6 +134,7 @@ my $section_regex;  # Find the start of a section
>  my $function_regex;    # Find the name of a function
>                         #    (return offset and func name)
>  my $mcount_regex;      # Find the call site to mcount (return offset)
> +my $alignment;         # The .align value to use for $mcount_section
> 
>  if ($arch eq "x86") {
>      if ($bits == 64) {
> @@ -148,6 +149,7 @@ if ($arch eq "x86_64") {
>      $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:";
>      $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$";
>      $type = ".quad";
> +    $alignment = 8;
> 
>      # force flags for this arch
>      $ld .= " -m elf_x86_64";
> @@ -160,6 +162,7 @@ if ($arch eq "x86_64") {
>      $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:";
>      $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$";
>      $type = ".long";
> +    $alignment = 4;
> 
>      # force flags for this arch
>      $ld .= " -m elf_i386";
> @@ -288,6 +291,7 @@ sub update_funcs
>             open(FILE, ">$mcount_s") || die "can't create $mcount_s\n";
>             $opened = 1;
>             print FILE "\t.section $mcount_section,\"a\",\@progbits\n";
> +           print FILE "\t.align $alignment\n";
>         }
>         printf FILE "\t%s %s + %d\n", $type, $ref_func, $offsets[$i] - $offset;
>      }
> --
> 1.5.6.4
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