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authorCatalin Marinas <catalin.marinas@arm.com>2013-03-21 16:28:47 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2013-03-21 17:39:31 +0000
commit62479586532715b6da4777374a6f53b32453385e (patch)
tree232004eb56bf36b966ea11ec8295a1b2893ac9e9 /arch/arm64/include
parent2b8cac814cd5a0a305d62dcd1d589faccb705a4d (diff)
downloadlinaro-lsk-62479586532715b6da4777374a6f53b32453385e.tar.gz
arm64: klib: Optimised atomic bitops
This patch implements the AArch64-specific atomic bitops functions using exclusive memory accesses to avoid locking. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
-rw-r--r--arch/arm64/include/asm/bitops.h18
1 files changed, 16 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/bitops.h b/arch/arm64/include/asm/bitops.h
index 5e693073b03..aa5b59d6ba4 100644
--- a/arch/arm64/include/asm/bitops.h
+++ b/arch/arm64/include/asm/bitops.h
@@ -32,6 +32,16 @@
#error only <linux/bitops.h> can be included directly
#endif
+/*
+ * Little endian assembly atomic bitops.
+ */
+extern void set_bit(int nr, volatile unsigned long *p);
+extern void clear_bit(int nr, volatile unsigned long *p);
+extern void change_bit(int nr, volatile unsigned long *p);
+extern int test_and_set_bit(int nr, volatile unsigned long *p);
+extern int test_and_clear_bit(int nr, volatile unsigned long *p);
+extern int test_and_change_bit(int nr, volatile unsigned long *p);
+
#include <asm-generic/bitops/builtin-__ffs.h>
#include <asm-generic/bitops/builtin-ffs.h>
#include <asm-generic/bitops/builtin-__fls.h>
@@ -45,9 +55,13 @@
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/lock.h>
-#include <asm-generic/bitops/atomic.h>
#include <asm-generic/bitops/non-atomic.h>
#include <asm-generic/bitops/le.h>
-#include <asm-generic/bitops/ext2-atomic.h>
+
+/*
+ * Ext2 is defined to use little-endian byte ordering.
+ */
+#define ext2_set_bit_atomic(lock, nr, p) test_and_set_bit_le(nr, p)
+#define ext2_clear_bit_atomic(lock, nr, p) test_and_clear_bit_le(nr, p)
#endif /* __ASM_BITOPS_H */