[PATCH] Fix oprofile regression: select RING_BUFFER_ALLOW_SWAP

[Christian Borntraeger]

commit 85bac32c4a52c592b857f2c360cc5ec93a097d70                                                                                                                             
    ring-buffer: only enable ring_buffer_swap_cpu when needed
broke oprofile (at least on s390, but likely on all platforms).

this patch lets oprofile select RING_BUFER_ALLOW_SWAP to make 
ring_buffer_swap_cpu usable for oprofile.

Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
CC-ed: Steven Rostedt <srostedt@xxxxxxxxxx> 
CC-ed: Ingo Molnar <mingo@xxxxxxx>
CC-ed: Robert Richter <robert.richter@xxxxxxx>                                                                                                                      
---
 arch/Kconfig |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6/arch/Kconfig
===================================================================
--- linux-2.6.orig/arch/Kconfig
+++ linux-2.6/arch/Kconfig
@@ -9,6 +9,7 @@ config OPROFILE
 	depends on TRACING_SUPPORT
 	select TRACING
 	select RING_BUFFER
+	select RING_BUFFER_ALLOW_SWAP
 	help
 	  OProfile is a profiling system capable of profiling the
 	  whole system, include the kernel, kernel modules, libraries,
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