From: Steven Rostedt Date: Mon, 12 May 2008 19:20:50 +0000 (+0200) Subject: ftrace: do not profile lib/string.o X-Git-Tag: v2.6.27-rc1~1102^2^2~1^2~97 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3594136ad67a54d77bcb2547e70011754a2f91d5;p=linux-2.6 ftrace: do not profile lib/string.o Most archs define the string and memory compare functions in assembly. Some do not. But these functions may be used in some archs at early boot up. Since most archs define this code in assembly and they are not usually traced, there's no need to trace them when they are not defined in assembly. This patch removes the -pg from the CFLAGS for lib/string.o. This prevents the string functions use in either vdso or early bootup from crashing the system. Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- diff --git a/lib/Makefile b/lib/Makefile index 74b0cfb1fc..6ca9e6ee1e 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -8,6 +8,14 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \ sha1.o irq_regs.o reciprocal_div.o argv_split.o \ proportions.o prio_heap.o ratelimit.o +ifdef CONFIG_FTRACE +# Do not profile string.o, since it may be used in early boot or vdso +ORIG_CFLAGS := $(KBUILD_CFLAGS) +KBUILD_CFLAGS = $(if $(subst string,,$(basename $(notdir $@))), \ + $(ORIG_CFLAGS), \ + $(subst -pg,,$(ORIG_CFLAGS))) +endif + lib-$(CONFIG_MMU) += ioremap.o lib-$(CONFIG_SMP) += cpumask.o