[PATCH 1/2] perf_event: remove unused DEBUG_PERF_USE_VMALLOC
From: peterz@infradead.org (Peter Zijlstra)
Date: 2016-08-31 07:05:22
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linuxppc-dev, lkml
On Tue, Aug 30, 2016 at 02:08:34PM -0500, Kim Phillips wrote:
quoted hunk ↗ jump to hunk
This 'DEBUG'-prefixed version of PERF_USE_VMALLOC is not used anywhere. It appears to be leftovers from commit 906010b "perf_event: Provide vmalloc() based mmap() backing" that introduced it. Not sure what commit cb30711 "perf_event: Don't allow vmalloc() backed perf on powerpc" was trying to do with it either. Signed-off-by: Kim Phillips <redacted> Cc: Peter Zijlstra <redacted> Cc: Michael Ellerman <mpe@ellerman.id.au> --- init/Kconfig | 13 ------------- 1 file changed, 13 deletions(-)diff --git a/init/Kconfig b/init/Kconfig index cac3f09..934a61f 100644 --- a/init/Kconfig +++ b/init/Kconfig@@ -1707,19 +1707,6 @@ config PERF_EVENTS Say Y if unsure. -config DEBUG_PERF_USE_VMALLOC - default n - bool "Debug: use vmalloc to back perf mmap() buffers" - depends on PERF_EVENTS && DEBUG_KERNEL && !PPC - select PERF_USE_VMALLOC
^^^^^ It forces the use of vmalloc backed pages for the ring-buffer so that we can test that code on x86, which otherwise doesn't use it.