From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Thu, 7 Feb 2008 08:16:11 +0000 (-0800)
Subject: Add cmpxchg_local to arm
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=176393d4232a89aaf8745b0726f4d212a20103f1;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

Add cmpxchg_local to arm

Use the new generic cmpxchg_local (disables interrupt). Also use the generic
cmpxchg as fallback if SMP is not set.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/asm-arm/system.h b/include/asm-arm/system.h
index 28425c473e71..6335de9a2bb3 100644
--- a/include/asm-arm/system.h
+++ b/include/asm-arm/system.h
@@ -363,6 +363,21 @@ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size
 extern void disable_hlt(void);
 extern void enable_hlt(void);
 
+#include <asm-generic/cmpxchg-local.h>
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#define cmpxchg_local(ptr, o, n)				  	       \
+	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
+			(unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
+
+#ifndef CONFIG_SMP
+#include <asm-generic/cmpxchg.h>
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #define arch_align_stack(x) (x)