linux-kernel - [PATCH v2] x86/alternatives: fixup alternative_call

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Date:   Sun, 14 Jan 2018 15:05:04 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] x86/alternatives: fixup alternative_call_2

The following pattern fails to compile while the same pattern
with alternative_call() does:

	if (...)
		alternative_call_2(...);
	else
		alternative_call_2(...);

as it expands into

	if (...)
	{
	};	<===
	else
	{
	};

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 arch/x86/include/asm/alternative.h |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/arch/x86/include/asm/alternative.h
+++ b/arch/x86/include/asm/alternative.h
@@ -218,13 +218,11 @@ static inline int alternatives_text_reserved(void *start, void *end)
  */
 #define alternative_call_2(oldfunc, newfunc1, feature1, newfunc2, feature2,   \
 			   output, input...)				      \
-{									      \
 	asm volatile (ALTERNATIVE_2("call %P[old]", "call %P[new1]", feature1,\
 		"call %P[new2]", feature2)				      \
 		: output, ASM_CALL_CONSTRAINT				      \
 		: [old] "i" (oldfunc), [new1] "i" (newfunc1),		      \
-		  [new2] "i" (newfunc2), ## input);			      \
-}
+		  [new2] "i" (newfunc2), ## input)
 
 /*
  * use this macro(s) if you need more than one output parameter