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| author | Will Deacon <will.deacon@arm.com> | 2010-03-03 11:47:58 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-04 12:13:28 +0100 |
| commit | da7196e1f986c846ffa8b2ec385223fad38e8518 (patch) | |
| tree | 839241169823bf6201630afb16448ea131b73b65 /tools/perf/perf.h | |
| parent | 4f16d4e0c9a4b20d9f0db365587b96d6001efd7d (diff) | |
| download | lwn-da7196e1f986c846ffa8b2ec385223fad38e8518.tar.gz lwn-da7196e1f986c846ffa8b2ec385223fad38e8518.zip | |
perf, ARM: Modify kuser rmb() call to compile for Thumb-2
The Thumb-2 instruction set does not provide an encoding
for sub pc, r0, #95 as present in the rmb() definition used
by perf. This results in compilation failure when using a
compiler targetting an instruction set other than ARM.
This patch redefines rmb() for ARM by casting the address
of the kuser helper to a function pointer, therefore getting
the compiler to take care of making the call.
Patch taken against tip/master.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Jamie Iles <jamie.iles@picochip.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1267616878-2154-1-git-send-email-will.deacon@arm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/perf.h')
| -rw-r--r-- | tools/perf/perf.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/tools/perf/perf.h b/tools/perf/perf.h index 75f941bfba9e..6fb379bc1d1f 100644 --- a/tools/perf/perf.h +++ b/tools/perf/perf.h @@ -65,9 +65,7 @@ * 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 rmb() ((void(*)(void))0xffff0fa0)() #define cpu_relax() asm volatile("":::"memory") #endif |