linux-kernel - [ 77/94] x86, relocs: Workaround for binutils 2.22.52.0.1 section bug

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Message-Id: <20120527010434.607564102@linuxfoundation.org>
Date:	Sun, 27 May 2012 10:05:40 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, "H.J. Lu" <hjl.tools@...il.com>,
	Jarkko Sakkinen <jarkko.sakkinen@...el.com>
Subject: [ 77/94] x86, relocs: Workaround for binutils 2.22.52.0.1 section bug

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "H. Peter Anvin" <hpa@...ux.intel.com>

commit a3e854d95a76862cd37937e0b0438f540536771a upstream.

GNU ld 2.22.52.0.1 has a bug that it blindly changes symbols from
section-relative to absolute if they are in a section of zero length.
This turns the symbols __init_begin and __init_end into absolute
symbols.  Let the relocs program know that those should be treated as
relative symbols.

Reported-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
Cc: H.J. Lu <hjl.tools@...il.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/tools/relocs.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -56,7 +56,11 @@ static const char * const sym_regex_kern
  * as absolute (typically defined outside any section in the linker script.)
  */
 	[S_REL] =
-	"^_end$",
+	"^(__init_(begin|end)|"
+	"__x86_cpu_dev_(start|end)|"
+	"(__parainstructions|__alt_instructions)(|_end)|"
+	"(__iommu_table|__apicdrivers|__smp_locks)(|_end)|"
+	"_end)$"
 };

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