linux-kernel - [PATCH v2 3/4] locking/atomic: openrisc: arch_cmpxchg[64]

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Message-Id: <20231104091615.4884-4-wuqiang.matt@bytedance.com>
Date:   Sat,  4 Nov 2023 17:16:14 +0800
From:   "wuqiang.matt" <wuqiang.matt@...edance.com>
To:     vgupta@...nel.org, bcain@...cinc.com, jonas@...thpole.se,
        stefan.kristiansson@...nalahti.fi, shorne@...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.orgm, mhiramat@...nel.org
Cc:     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.ne, "wuqiang.matt" <wuqiang.matt@...edance.com>
Subject: [PATCH v2 3/4] locking/atomic: openrisc: arch_cmpxchg[64]_local undefined

For architectures that support native cmpxchg, we'd like to
implement arch_cmpxchg[64]_local with the native variants of
supported data size. If not, the generci_cmpxchg[64]_local
will be used.

Signed-off-by: wuqiang.matt <wuqiang.matt@...edance.com>
---
 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