linux-kernel - [PATCH 15/24] vmlinux.lds: move __attribute__((__cold__)) functions back into final .text section

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Date:	Mon, 30 Jun 2008 23:35:09 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	kbuild <linux-kbuild@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Cc:	Jan Beulich <jbeulich@...ell.com>, Sam Ravnborg <sam@...nborg.org>
Subject: [PATCH 15/24] vmlinux.lds: move __attribute__((__cold__)) functions back into final .text section

From: Jan Beulich <jbeulich@...ell.com>

Due to the addition of __attribute__((__cold__)) to a few symbols
without adjusting the linker scripts, those symbols currently may end
up outside the [_stext,_etext) range, as they get placed in
.text.unlikely by (at least) gcc 4.3.0. This may confuse code not only
outside of the kernel, symbol_put_addr()'s BUG() could also trigger.
Hence we need to add .text.unlikely (and for future uses of
__attribute__((__hot__)) also .text.hot) to the TEXT_TEXT() macro.

Issue observed by Lukas Lipavsky.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>
Tested-by: Lukas Lipavsky <llipavsky@...e.cz>
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
---
 include/asm-generic/vmlinux.lds.h |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index f054778..5a544bf 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -204,6 +204,7 @@
  * during second ld run in second ld pass when generating System.map */
 #define TEXT_TEXT							\
 		ALIGN_FUNCTION();					\
+		*(.text.hot)						\
 		*(.text)						\
 		*(.ref.text)						\
 		*(.text.init.refok)					\
@@ -213,7 +214,8 @@
 	CPU_KEEP(init.text)						\
 	CPU_KEEP(exit.text)						\
 	MEM_KEEP(init.text)						\
-	MEM_KEEP(exit.text)
+	MEM_KEEP(exit.text)						\
+		*(.text.unlikely)
 
 
 /* sched.text is aling to function alignment to secure we have same
-- 
1.5.6.1.93.gef98

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