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From:   Genjian <zhanggenjian123@gmail.com>
To:     tsbogend@alpha.franken.de
Cc:     linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
        zhanggenjian123@gmail.com, Genjian Zhang <zhanggenjian@kylinos.cn>,
        k2ci <kernel-bot@kylinos.cn>
Subject: [PATCH] fix ___SYNC () build error when PROFILE_ALL_BRANCHES is enabled
Date:   Wed, 26 Apr 2023 20:49:48 +0800
Message-Id: <20230426124948.1072216-1-zhanggenjian@kylinos.cn>
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From: Genjian Zhang <zhanggenjian@kylinos.cn>

compiler error (mips-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110):

{standard input}: Assembler messages:
{standard input}:171: Error: found '(', expected: ')'
{standard input}:171: Error: found '(', expected: ')'
{standard input}:171: Error: non-constant expression in ".if" statement
{standard input}:171: Error: junk at end of line, first unrecognized
character is `('

Preprocessor expand ___SYNC () macros.However,'if' will be wrongly
replaced by C code when PROFILE_ALL_BRANCHES is enabled and ___SYNC
is used in inline assembly.This leads to syntax errors in the code.
Compilers report a lot of errors like the above.
Move '.if' into quoted strings to fix it.

Reported-by: k2ci <kernel-bot@kylinos.cn>
Signed-off-by: Genjian Zhang <zhanggenjian@kylinos.cn>
---
 arch/mips/include/asm/sync.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/mips/include/asm/sync.h b/arch/mips/include/asm/sync.h
index aabd097933fe..d9f5a87424e7 100644
--- a/arch/mips/include/asm/sync.h
+++ b/arch/mips/include/asm/sync.h
@@ -175,7 +175,7 @@
  */
 #ifdef CONFIG_CPU_HAS_SYNC
 # define ____SYNC(_type, _reason, _else)			\
-	.if	(( _type ) != -1) && ( _reason );		\
+	((_type) != -1) && (_reason);				\
 	.set	push;						\
 	.set	MIPS_ISA_LEVEL_RAW;				\
 	.rept	__SYNC_rpt(_type);				\
@@ -192,13 +192,15 @@
 /*
  * Preprocessor magic to expand macros used as arguments before we insert them
  * into assembly code.
+ * In addition,‘if’ can not be substituted when CONFIG_PROFILE_ALL_BRANCHES is
+ * enabled.
  */
 #ifdef __ASSEMBLY__
 # define ___SYNC(type, reason, else)				\
-	____SYNC(type, reason, else)
+	.if	____SYNC(type, reason, else)
 #else
 # define ___SYNC(type, reason, else)				\
-	__stringify(____SYNC(type, reason, else))
+	".if"	__stringify(____SYNC(type, reason, else))
 #endif
 
 #define __SYNC(type, reason)					\
-- 
2.25.1