linux-kernel - [RFC/RFT PATCH 2/6] arc: Wire up cmpxchg64

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Message-ID: <20251127092226.1439196-10-ardb+git@google.com>
Date: Thu, 27 Nov 2025 10:22:29 +0100
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-hardening@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Ard Biesheuvel <ardb@...nel.org>, Kees Cook <kees@...nel.org>, Ryan Roberts <ryan.roberts@....com>, 
	Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>, Jeremy Linton <jeremy.linton@....com>, 
	Catalin Marinas <Catalin.Marinas@....com>, Mark Rutland <mark.rutland@....com>, 
	"Jason A. Donenfeld" <Jason@...c4.com>
Subject: [RFC/RFT PATCH 2/6] arc: Wire up cmpxchg64_local() to generic implementation

From: Ard Biesheuvel <ardb@...nel.org>

Provide cmpxchg64_local() for hexagon so we can start using it in
generic code.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/arc/include/asm/cmpxchg.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h
index 76f43db0890f..f2d55823645c 100644
--- a/arch/arc/include/asm/cmpxchg.h
+++ b/arch/arc/include/asm/cmpxchg.h
@@ -12,6 +12,7 @@
 
 #include <asm/barrier.h>
 #include <asm/smp.h>
+#include <asm-generic/cmpxchg-local.h>
 
 #ifdef CONFIG_ARC_HAS_LLSC
 
@@ -142,4 +143,6 @@
 
 #endif
 
+#define arch_cmpxchg64_local __generic_cmpxchg64_local
+
 #endif
-- 
2.52.0.107.ga0afd4fd5b-goog