linux-kernel - [tip: locking/core] locking/atomic/x86: Use ALT_OUTPUT_SP() for __alternative

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Message-ID: <173089006563.32228.13896147526722814370.tip-bot2@tip-bot2>
Date: Wed, 06 Nov 2024 10:47:45 -0000
From: "tip-bot2 for Uros Bizjak" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: locking/core] locking/atomic/x86: Use ALT_OUTPUT_SP() for
 __alternative_atomic64()

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     8b64db9733c2e4d30fd068d0b9dcef7b4424b035
Gitweb:        https://git.kernel.org/tip/8b64db9733c2e4d30fd068d0b9dcef7b4424b035
Author:        Uros Bizjak <ubizjak@...il.com>
AuthorDate:    Sun, 03 Nov 2024 17:09:31 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 05 Nov 2024 12:55:34 +01:00

locking/atomic/x86: Use ALT_OUTPUT_SP() for __alternative_atomic64()

CONFIG_X86_CMPXCHG64 variant of x86_32 __alternative_atomic64()
macro uses CALL instruction inside asm statement. Use
ALT_OUTPUT_SP() macro to add required dependence on %esp register.

Fixes: 819165fb34b9 ("x86: Adjust asm constraints in atomic64 wrappers")
Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20241103160954.3329-1-ubizjak@gmail.com
---
 arch/x86/include/asm/atomic64_32.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/atomic64_32.h b/arch/x86/include/asm/atomic64_32.h
index 1f650b4..6c6e9b9 100644
--- a/arch/x86/include/asm/atomic64_32.h
+++ b/arch/x86/include/asm/atomic64_32.h
@@ -51,7 +51,8 @@ static __always_inline s64 arch_atomic64_read_nonatomic(const atomic64_t *v)
 #ifdef CONFIG_X86_CMPXCHG64
 #define __alternative_atomic64(f, g, out, in...) \
 	asm volatile("call %c[func]" \
-		     : out : [func] "i" (atomic64_##g##_cx8), ## in)
+		     : ALT_OUTPUT_SP(out) \
+		     : [func] "i" (atomic64_##g##_cx8), ## in)
 
 #define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8)
 #else