linux-kernel - [ 113/117] x86, relocs: Workaround for binutils 2.22.52.0.1 section bug

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Message-Id: <20120528031218.456862887@decadent.org.uk>
Date:	Mon, 28 May 2012 04:13:55 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, "H. Peter Anvin" <hpa@...ux.intel.com>,
	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: [ 113/117] x86, relocs: Workaround for binutils 2.22.52.0.1 section bug

3.2-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: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/tools/relocs.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index 0291470..c3cfbb2 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -56,7 +56,11 @@ static const char * const sym_regex_kernel[S_NSYMTYPES] = {
  * 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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