linux-kernel - [RFC/RFT PATCH 1/6] hexagon: Wire up cmpxchg64

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Message-ID: <20251127092226.1439196-9-ardb+git@google.com>
Date: Thu, 27 Nov 2025 10:22:28 +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 1/6] hexagon: 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/hexagon/include/asm/cmpxchg.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/hexagon/include/asm/cmpxchg.h b/arch/hexagon/include/asm/cmpxchg.h
index 9c58fb81f7fd..05e426475d2a 100644
--- a/arch/hexagon/include/asm/cmpxchg.h
+++ b/arch/hexagon/include/asm/cmpxchg.h
@@ -8,6 +8,8 @@
 #ifndef _ASM_CMPXCHG_H
 #define _ASM_CMPXCHG_H
 
+#include <asm-generic/cmpxchg-local.h>
+
 /*
  * __arch_xchg - atomically exchange a register and a memory location
  * @x: value to swap
@@ -72,4 +74,6 @@ __arch_xchg(unsigned long x, volatile void *ptr, int size)
 	__oldval;						\
 })
 
+#define arch_cmpxchg64_local __generic_cmpxchg64_local
+
 #endif /* _ASM_CMPXCHG_H */
-- 
2.52.0.107.ga0afd4fd5b-goog