* [PATCH 1/3] locking/atomic: arc: use generic_cmpxchg[64]_local for arch_cmpxchg[64]_local
@ 2023-10-26 7:38 wuqiang.matt
0 siblings, 0 replies; only message in thread
From: wuqiang.matt @ 2023-10-26 7:38 UTC (permalink / raw)
To: Vineet Gupta, Palmer Dabbelt, Ingo Molnar, Geert Uytterhoeven,
Peter Zijlstra (Intel), Andi Shyti, Andrzej Hajda
Cc: linux-trace-kernel, mhiramat, mattwu, wuqiang.matt
arch_cmpxchg[64]_local() are not defined for arc architecture. This patch
implement them with generci_cmpxchg[64]_local, advised by Masami Hiramatsu.
Closes: https://lore.kernel.org/linux-trace-kernel/169824660459.24340.14614817132696360531.stgit@devnote2
Closes: https://lore.kernel.org/oe-kbuild-all/202310241310.Ir5uukOG-lkp@intel.com/
Signed-off-by: wuqiang.matt <wuqiang.matt@bytedance.com>
---
arch/arc/include/asm/cmpxchg.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h
index e138fde067de..ef644cdbe956 100644
--- a/arch/arc/include/asm/cmpxchg.h
+++ b/arch/arc/include/asm/cmpxchg.h
@@ -140,4 +140,18 @@
#endif
+/*
+ * always make arch_cmpxchg[64]_local available. __generic_cmpxchg[64]_local
+ * are atomic with respect to current cpu.
+ */
+#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))); \
+})
+#define arch_cmpxchg64_local(ptr, o, n) __generic_cmpxchg64_local((ptr), (o), (n))
+
#endif
--
2.40.1
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