ftrace: disable dynamic ftrace for all archs that use daemon

The ftrace daemon is complex and can cause nasty races if something goes wrong. Since it affects all of the kernel, this patch disables dynamic ftrace from any arch that depends on the daemon. Until the archs are ported over to the new MCOUNT_RECORD method, I am disabling dynamic ftrace from them. Note: I am leaving in the arch/<arch>/kernel/ftrace.c code alone since that can be used when the arch is ported to MCOUNT_RECORD. To port the arch to MCOUNT_RECORD, the scripts/recordmcount.pl needs to be updated. I will make that easier to do for 2.6.29. For 28, we will keep the archs disabled. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
mariux64 · Oct 23, 2008 · 07c4cc1 · 07c4cc1
1 parent 6912896
commit 07c4cc1
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diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
@@ -17,7 +17,6 @@ config ARM
 	select HAVE_KPROBES if (!XIP_KERNEL)
 	select HAVE_KRETPROBES if (HAVE_KPROBES)
 	select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
-	select HAVE_DYNAMIC_FTRACE if (HAVE_FUNCTION_TRACER)
 	select HAVE_GENERIC_DMA_COHERENT
 	help
 	  The ARM series is a line of low-power-consumption RISC chip designs

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
@@ -111,7 +111,6 @@ config ARCH_NO_VIRT_TO_BUS
 config PPC
 	bool
 	default y
-	select HAVE_DYNAMIC_FTRACE
 	select HAVE_FUNCTION_TRACER
 	select ARCH_WANT_OPTIONAL_GPIOLIB
 	select HAVE_IDE

diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
@@ -11,7 +11,6 @@ config SPARC
 config SPARC64
 	bool
 	default y
-	select HAVE_DYNAMIC_FTRACE
 	select HAVE_FUNCTION_TRACER
 	select HAVE_IDE
 	select HAVE_LMB