linux-kernel - [PATCH v2] locking/atomic: sh: Use generic_cmpxchg_local for arch_cmpxchg

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Message-Id: <169824660459.24340.14614817132696360531.stgit@devnote2>
Date:   Thu, 26 Oct 2023 00:10:05 +0900
From:   "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     "wuqiang . matt" <wuqiang.matt@...edance.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>, mhiramat@...nel.org,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org
Subject: [PATCH v2] locking/atomic: sh: Use generic_cmpxchg_local for arch_cmpxchg_local()

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Use __generic_cmpxchg_local() for arch_cmpxchg_local() implementation
in SH architecture because it does not implement arch_cmpxchg_local().

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202310241310.Ir5uukOG-lkp@intel.com/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 arch/sh/include/asm/cmpxchg.h |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/sh/include/asm/cmpxchg.h b/arch/sh/include/asm/cmpxchg.h
index 288f6f38d98f..5d617b3ef78f 100644
--- a/arch/sh/include/asm/cmpxchg.h
+++ b/arch/sh/include/asm/cmpxchg.h
@@ -71,4 +71,13 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
 				    (unsigned long)_n_, sizeof(*(ptr))); \
   })
 
+#include <asm-generic/cmpxchg-local.h>
+
+#define arch_cmpxchg_local(ptr, o, n) ({				\
+	(__typeof__(*ptr))__generic_cmpxchg_local((ptr),		\
+						  (unsigned long)(o),	\
+						  (unsigned long)(n),	\
+						  sizeof(*(ptr)));	\
+})
+
 #endif /* __ASM_SH_CMPXCHG_H */