diff options
| author | Jamie Iles <jamie.iles@picochip.com> | 2009-12-11 12:20:09 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-11 13:50:21 +0100 |
| commit | 58e9f94138c1d9c47f6a63632ca7a78fc6dcc15f (patch) | |
| tree | caa7d67b5b8f48a8f04ae908e89b7c9a00c852e0 /tools/perf/perf.h | |
| parent | 99ac64c826e62a07e5818cfde620be4d524f1edf (diff) | |
| download | lwn-58e9f94138c1d9c47f6a63632ca7a78fc6dcc15f.tar.gz lwn-58e9f94138c1d9c47f6a63632ca7a78fc6dcc15f.zip | |
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@picochip.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mikael Pettersson <mikpe@it.uu.se>
LKML-Reference: <1260534009-5394-1-git-send-email-jamie.iles@picochip.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/perf.h')
| -rw-r--r-- | 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 454d5d55f32d..75f941bfba9e 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> |