linux-kernel - [tip:perf/core] jump label: Add _ASM_ALIGN for x86 and x86

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Date:	Wed, 27 Apr 2011 15:23:35 GMT
From:	tip-bot for Jason Baron <jbaron@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	mathieu.desnoyers@...icios.com, a.p.zijlstra@...llo.nl,
	rostedt@...dmis.org, tglx@...utronix.de, jbaron@...hat.com
Subject: [tip:perf/core] jump label: Add _ASM_ALIGN for x86 and x86_64

Commit-ID:  ef64789413c73f32faa5e5f1bc393e5843b0aa51
Gitweb:     http://git.kernel.org/tip/ef64789413c73f32faa5e5f1bc393e5843b0aa51
Author:     Jason Baron <jbaron@...hat.com>
AuthorDate: Wed, 16 Mar 2011 15:58:27 -0400
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Mon, 4 Apr 2011 13:42:51 -0400

jump label: Add _ASM_ALIGN for x86 and x86_64

The linker should not be adding holes to word size aligned pointers, but
out of paranoia we are explicitly specifying that alignment. I have not
seen any holes in the jump label section in practice.

Signed-off-by: Jason Baron <jbaron@...hat.com>
LKML-Reference: <e119fbd060c9452c56063ea6148ba1070e7434cc.1300299760.git.jbaron@...hat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 arch/x86/include/asm/jump_label.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h
index f217cee..a32b18c 100644
--- a/arch/x86/include/asm/jump_label.h
+++ b/arch/x86/include/asm/jump_label.h
@@ -16,6 +16,7 @@ static __always_inline bool arch_static_branch(struct jump_label_key *key)
 	asm goto("1:"
 		JUMP_LABEL_INITIAL_NOP
 		".pushsection __jump_table,  \"aw\" \n\t"
+		_ASM_ALIGN "\n\t"
 		_ASM_PTR "1b, %l[l_yes], %c0 \n\t"
 		".popsection \n\t"
 		: :  "i" (key) : : l_yes);
--
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