linux-kernel - [PATCH v3 4/5] arm64: barrier: Support waiting in smp_cond_load_relaxed

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Message-Id: <20250627044805.945491-5-ankur.a.arora@oracle.com>
Date: Thu, 26 Jun 2025 21:48:04 -0700
From: Ankur Arora <ankur.a.arora@...cle.com>
To: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org
Cc: arnd@...db.de, catalin.marinas@....com, will@...nel.org,
        peterz@...radead.org, akpm@...ux-foundation.org, mark.rutland@....com,
        harisokn@...zon.com, cl@...two.org, ast@...nel.org, memxor@...il.com,
        zhenglifeng1@...wei.com, xueshuai@...ux.alibaba.com,
        joao.m.martins@...cle.com, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com
Subject: [PATCH v3 4/5] arm64: barrier: Support waiting in smp_cond_load_relaxed_timewait()

Define __smp_timewait_store() to support waiting for a condition
variable via __cmpwait_relaxed().

Used from smp_cond_load_{relaxed,acquire}_timewait().

Cc: Will Deacon <will@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Reviewed-by: Christoph Lameter (Ampere) <cl@...two.org>
Reviewed-by: Haris Okanovic <harisokn@...zon.com>
Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
 arch/arm64/include/asm/barrier.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index 1ca947d5c939..7c56e2621c7d 100644
--- a/arch/arm64/include/asm/barrier.h
+++ b/arch/arm64/include/asm/barrier.h
@@ -216,6 +216,12 @@ do {									\
 	(typeof(*ptr))VAL;						\
 })
 
+/*
+ * Support waiting in smp_cond_load_{relaxed,acquire}_timewait().
+ */
+#define __smp_timewait_store(ptr, val)					\
+		__cmpwait_relaxed(ptr, val)
+
 #include <asm-generic/barrier.h>
 
 #endif	/* __ASSEMBLY__ */
-- 
2.43.5