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authorRobert Richter <robert.richter@amd.com>2010-10-15 12:45:00 +0200
committerRobert Richter <robert.richter@amd.com>2010-10-15 12:45:00 +0200
commit6268464b370e234e0255330190f9bd5d19386ad7 (patch)
tree5742641092ce64227dd2086d78baaede57da1f80 /arch/x86/include/asm/jump_label.h
parent7df01d96b295e400167e78061b81d4c91630b12d (diff)
parent0fdf13606b67f830559abdaad15980c7f4f05ec4 (diff)
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Merge remote branch 'tip/perf/core' into oprofile/core
Conflicts: arch/arm/oprofile/common.c kernel/perf_event.c
Diffstat (limited to 'arch/x86/include/asm/jump_label.h')
-rw-r--r--arch/x86/include/asm/jump_label.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h
new file mode 100644
index 0000000..f52d42e
--- /dev/null
+++ b/arch/x86/include/asm/jump_label.h
@@ -0,0 +1,37 @@
+#ifndef _ASM_X86_JUMP_LABEL_H
+#define _ASM_X86_JUMP_LABEL_H
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <asm/nops.h>
+
+#define JUMP_LABEL_NOP_SIZE 5
+
+# define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"
+
+# define JUMP_LABEL(key, label) \
+ do { \
+ asm goto("1:" \
+ JUMP_LABEL_INITIAL_NOP \
+ ".pushsection __jump_table, \"a\" \n\t"\
+ _ASM_PTR "1b, %l[" #label "], %c0 \n\t" \
+ ".popsection \n\t" \
+ : : "i" (key) : : label); \
+ } while (0)
+
+#endif /* __KERNEL__ */
+
+#ifdef CONFIG_X86_64
+typedef u64 jump_label_t;
+#else
+typedef u32 jump_label_t;
+#endif
+
+struct jump_entry {
+ jump_label_t code;
+ jump_label_t target;
+ jump_label_t key;
+};
+
+#endif