linux-kernel - [PATCH] x86/percpu: Use ALT_OUTPUT_SP() for percpu_{,try_}cmpxchg{64,128}

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Message-ID: <20241105151520.2632-1-ubizjak@gmail.com>
Date: Tue,  5 Nov 2024 16:15:08 +0100
From: Uros Bizjak <ubizjak@...il.com>
To: x86@...nel.org,
	linux-kernel@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>,
	Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jan Beulich <JBeulich@...e.com>
Subject: [PATCH] x86/percpu: Use ALT_OUTPUT_SP() for percpu_{,try_}cmpxchg{64,128}_op()

percpu_{,try_}cmpxchg{64,128}() macros use CALL instruction inside
asm statement in one of their alternatives. Use ALT_OUTPUT_SP()
macro to add required dependence on %esp register.

Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Cc: Will Deacon <will@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Jan Beulich <JBeulich@...e.com>
---
 arch/x86/include/asm/percpu.h | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index c55a79d5feae..b131d1bb9445 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -349,9 +349,9 @@ do {									\
 									\
 	asm qual (ALTERNATIVE("call this_cpu_cmpxchg8b_emu",		\
 			      "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \
-		  : [var] "+m" (__my_cpu_var(_var)),			\
-		    "+a" (old__.low),					\
-		    "+d" (old__.high)					\
+		  : ALT_OUTPUT_SP([var] "+m" (__my_cpu_var(_var)),	\
+				  "+a" (old__.low),			\
+				  "+d" (old__.high))			\
 		  : "b" (new__.low),					\
 		    "c" (new__.high),					\
 		    "S" (&(_var))					\
@@ -380,10 +380,10 @@ do {									\
 	asm qual (ALTERNATIVE("call this_cpu_cmpxchg8b_emu",		\
 			      "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \
 		  CC_SET(z)						\
-		  : CC_OUT(z) (success),				\
-		    [var] "+m" (__my_cpu_var(_var)),			\
-		    "+a" (old__.low),					\
-		    "+d" (old__.high)					\
+		  : ALT_OUTPUT_SP (CC_OUT(z) (success),			\
+				   [var] "+m" (__my_cpu_var(_var)),	\
+				   "+a" (old__.low),			\
+				   "+d" (old__.high))			\
 		  : "b" (new__.low),					\
 		    "c" (new__.high),					\
 		    "S" (&(_var))					\
@@ -420,9 +420,9 @@ do {									\
 									\
 	asm qual (ALTERNATIVE("call this_cpu_cmpxchg16b_emu",		\
 			      "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \
-		  : [var] "+m" (__my_cpu_var(_var)),			\
-		    "+a" (old__.low),					\
-		    "+d" (old__.high)					\
+		  : ALT_OUTPUT_SP ([var] "+m" (__my_cpu_var(_var)),	\
+				   "+a" (old__.low),			\
+				   "+d" (old__.high))			\
 		  : "b" (new__.low),					\
 		    "c" (new__.high),					\
 		    "S" (&(_var))					\
@@ -451,10 +451,10 @@ do {									\
 	asm qual (ALTERNATIVE("call this_cpu_cmpxchg16b_emu",		\
 			      "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \
 		  CC_SET(z)						\
-		  : CC_OUT(z) (success),				\
-		    [var] "+m" (__my_cpu_var(_var)),			\
-		    "+a" (old__.low),					\
-		    "+d" (old__.high)					\
+		  : ALT_OUTPUT_SP (CC_OUT(z) (success),			\
+				   [var] "+m" (__my_cpu_var(_var)),	\
+				   "+a" (old__.low),			\
+				   "+d" (old__.high))			\
 		  : "b" (new__.low),					\
 		    "c" (new__.high),					\
 		    "S" (&(_var))					\
-- 
2.42.0