linux-kernel - [PATCH 3.16 174/254] x86/alternatives: Add missing '\n' at end of ALTERNATIVE inline asm

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Message-ID: <lsq.1519831218.33661436@decadent.org.uk>
Date:   Wed, 28 Feb 2018 15:20:18 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, ak@...ux.intel.com,
        "Kees Cook" <keescook@...gle.com>,
        "Dave Hansen" <dave.hansen@...el.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Jiri Kosina" <jikos@...nel.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Greg Kroah-Hartman" <gregkh@...ux-foundation.org>,
        "David Woodhouse" <dwmw@...zon.co.uk>,
        "Tim Chen" <tim.c.chen@...ux.intel.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Rik van Riel" <riel@...hat.com>,
        "Andy Lutomirski" <luto@...capital.net>,
        "Paul Turner" <pjt@...gle.com>, gnomes@...rguk.ukuu.org.uk
Subject: [PATCH 3.16 174/254] x86/alternatives: Add missing '\n' at end of
 ALTERNATIVE inline asm

3.16.55-rc1 review patch.  If anyone has any objections, please let me know.

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

From: David Woodhouse <dwmw@...zon.co.uk>

commit b9e705ef7cfaf22db0daab91ad3cd33b0fa32eb9 upstream.

Where an ALTERNATIVE is used in the middle of an inline asm block, this
would otherwise lead to the following instruction being appended directly
to the trailing ".popsection", and a failed compile.

Fixes: 9cebed423c84 ("x86, alternative: Use .pushsection/.popsection")
Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: gnomes@...rguk.ukuu.org.uk
Cc: Rik van Riel <riel@...hat.com>
Cc: ak@...ux.intel.com
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Paul Turner <pjt@...gle.com>
Cc: Jiri Kosina <jikos@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Kees Cook <keescook@...gle.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@...ux-foundation.org>
Link: https://lkml.kernel.org/r/20180104143710.8961-8-dwmw@amazon.co.uk
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/include/asm/alternative.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/include/asm/alternative.h
+++ b/arch/x86/include/asm/alternative.h
@@ -124,7 +124,7 @@ static inline int alternatives_text_rese
 	".popsection\n"							\
 	".pushsection .altinstr_replacement, \"ax\"\n"			\
 	ALTINSTR_REPLACEMENT(newinstr, feature, 1)			\
-	".popsection"
+	".popsection\n"
 
 #define ALTERNATIVE_2(oldinstr, newinstr1, feature1, newinstr2, feature2)\
 	OLDINSTR_2(oldinstr, 1, 2)					\
@@ -135,7 +135,7 @@ static inline int alternatives_text_rese
 	".pushsection .altinstr_replacement, \"ax\"\n"			\
 	ALTINSTR_REPLACEMENT(newinstr1, feature1, 1)			\
 	ALTINSTR_REPLACEMENT(newinstr2, feature2, 2)			\
-	".popsection"
+	".popsection\n"
 
 /*
  * This must be included *after* the definition of ALTERNATIVE due to