linux-kernel - [PATCH v3 3/5] arch,locking/atomic: openrisc: add arch_cmpxchg[64]

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Message-Id: <20231121142347.241356-4-wuqiang.matt@bytedance.com>
Date:   Tue, 21 Nov 2023 22:23:45 +0800
From:   "wuqiang.matt" <wuqiang.matt@...edance.com>
To:     ubizjak@...il.com, mark.rutland@....com, vgupta@...nel.org,
        bcain@...cinc.com, jonas@...thpole.se,
        stefan.kristiansson@...nalahti.fi, shorne@...il.com,
        chris@...kel.net, jcmvbkbc@...il.com, geert@...ux-m68k.org,
        andi.shyti@...ux.intel.com, mingo@...nel.org, palmer@...osinc.com,
        andrzej.hajda@...el.com, arnd@...db.de, peterz@...radead.org,
        mhiramat@...nel.org
Cc:     linux-arch@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-hexagon@...r.kernel.org,
        linux-openrisc@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        mattwu@....com, linux@...ck-us.net,
        "wuqiang.matt" <wuqiang.matt@...edance.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v3 3/5] arch,locking/atomic: openrisc: add arch_cmpxchg[64]_local

openrisc hasn't arch_cmpxhg_local implemented, which causes
building failures for any references of try_cmpxchg_local,
reported by the kernel test robot.

This patch implements arch_cmpxchg[64]_local with the native
cmpxchg variant if the corresponding data size is supported,
otherwise generci_cmpxchg[64]_local is to be used.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202310272207.tLPflya4-lkp@intel.com/

Signed-off-by: wuqiang.matt <wuqiang.matt@...edance.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 arch/openrisc/include/asm/cmpxchg.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/openrisc/include/asm/cmpxchg.h b/arch/openrisc/include/asm/cmpxchg.h
index 8ee151c072e4..f1ffe8b6f5ef 100644
--- a/arch/openrisc/include/asm/cmpxchg.h
+++ b/arch/openrisc/include/asm/cmpxchg.h
@@ -139,6 +139,12 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
 					       (unsigned long)(n),	\
 					       sizeof(*(ptr)));		\
 	})
+#define arch_cmpxchg_local arch_cmpxchg
+
+/* always make arch_cmpxchg64_local available for openrisc */
+#include <asm-generic/cmpxchg-local.h>
+
+#define arch_cmpxchg64_local(ptr, o, n) __generic_cmpxchg64_local((ptr), (o), (n))
 
 /*
  * This function doesn't exist, so you'll get a linker error if
-- 
2.40.1