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Commit 0e341af8 authored by Rabin Vincent's avatar Rabin Vincent
Browse files

ARM: ftrace: enable function graph tracer 



Add the options to enable the function graph tracer on ARM.  Function
graph tracer support requires frame pointers, so exclude Thumb-2 and
also make sure FRAME_POINTER gets enabled when FUNCTION_GRAPH_TRACER is
used, since FUNCTION_TRACER doesn't "select FRAME_POINTER" when
ARM_UNWIND is used.  Therefore, with GCC 4.4.0+, you get plain function
tracing without frame pointers, but you'll need them if you want
function graph tracing.

Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarRabin Vincent <rabin@rab.in>
parent dd686eb1

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ config ARM 
	select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)

	select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)

	select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)

	select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)

	select HAVE_GENERIC_DMA_COHERENT

	select HAVE_KERNEL_GZIP

	select HAVE_KERNEL_LZO

arch/arm/Kconfig.debug

+1 −1
Original line number Diff line number Diff line
@@ -23,7 +23,7 @@ config STRICT_DEVMEM 
config FRAME_POINTER

	bool

	depends on !THUMB2_KERNEL

	default y if !ARM_UNWIND

	default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER

	help

	  If you say N here, the resulting kernel will be slightly smaller and

	  faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,