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

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Date:	Fri, 7 Nov 2008 13:12:47 +0000
From:	"Matt Fleming" <mjf@...too.org>
To:	LKML <linux-kernel@...r.kernel.org>, mingo@...e.hu,
	rostedt@...dmis.org
Subject: [PATCH] ftrace: Allow section alignment

Provide a means of aligning the __mcount_loc section.

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

View attachment "0001-ftrace-Allow-section-alignment.patch" of type "text/x-diff" (1777 bytes)