perf_event: Provide vmalloc() based mmap() backing

Some architectures such as Sparc, ARM and MIPS (basically
everything with flush_dcache_page()) need to deal with dcache
aliases by carefully placing pages in both kernel and user maps.

These architectures typically have to use vmalloc_user() for this.

However, on other architectures, vmalloc() is not needed and has
the downsides of being more restricted and slower than regular
allocations.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: David Miller <davem@davemloft.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1254830228.21044.272.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 97fca4695e0b..9b70a2f28dc7 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -26,6 +26,7 @@ config SPARC
         select RTC_CLASS
         select RTC_DRV_M48T59
         select HAVE_PERF_EVENTS
+        select PERF_USE_VMALLOC
         select HAVE_DMA_ATTRS
         select HAVE_DMA_API_DEBUG
 
@@ -48,6 +49,7 @@ config SPARC64
         select RTC_DRV_SUN4V
         select RTC_DRV_STARFIRE
         select HAVE_PERF_EVENTS
+        select PERF_USE_VMALLOC
 
 config ARCH_DEFCONFIG
         string