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Peter Anvin" Subject: [PATCH 1/2] locking/atomic/x86: Use ALT_OUTPUT_SP() for __alternative_atomic64() Date: Thu, 24 Oct 2024 20:05:13 +0200 Message-ID: <20241024180612.162045-1-ubizjak@gmail.com> X-Mailer: git-send-email 2.42.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" --- 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 1f650b4dde50..6c6e9b9f98a4 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 -- 2.42.0