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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 <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Steven Rostedt 2008-05-12 21:20:50 +02:00 committed by Thomas Gleixner
parent caf8cdebfb
commit 3594136ad6
1 changed files with 8 additions and 0 deletions
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8
lib/Makefile
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@ -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