Commit-ID: 58e9f94138c1d9c47f6a63632ca7a78fc6dcc15f
Gitweb: http://git.kernel.org/tip/58e9f94138c1d9c47f6a63632ca7a78fc6dcc15f
Author: Jamie Iles <jamie.iles@xxxxxxxxxxxx>
AuthorDate: Fri, 11 Dec 2009 12:20:09 +0000
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Fri, 11 Dec 2009 13:50:21 +0100
perf tools: Allow building for ARM
Add definitions of rmb() and cpu_relax() and include the ARM
unistd.h header. The __kuser_memory_barrier helper in the helper
page is used to provide the correct memory barrier depending on
the CPU type.
[ The rmb() will work on v6 and v7, segfault on v5. Dynamic
detection to add v5 support will be added later. ]
Signed-off-by: Jamie Iles <jamie.iles@xxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Mikael Pettersson <mikpe@xxxxxxxx>
LKML-Reference: <1260534009-5394-1-git-send-email-jamie.iles@xxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
tools/perf/perf.h | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 454d5d5..75f941b 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -59,6 +59,18 @@
#define cpu_relax() asm volatile ("hint @pause" ::: "memory")
#endif
+#ifdef __arm__
+#include "../../arch/arm/include/asm/unistd.h"
+/*
+ * Use the __kuser_memory_barrier helper in the CPU helper page. See
+ * arch/arm/kernel/entry-armv.S in the kernel source for details.
+ */
+#define rmb() asm volatile("mov r0, #0xffff0fff; mov lr, pc;" \
+ "sub pc, r0, #95" ::: "r0", "lr", "cc", \
+ "memory")
+#define cpu_relax() asm volatile("":::"memory")
+#endif
+
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
--
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