ftrace: do not trace library functions
make function tracing more robust: do not trace library functions. We've already got a sizable list of exceptions: ifdef CONFIG_FTRACE # Do not profile string.o, since it may be used in early boot or vdso CFLAGS_REMOVE_string.o = -pg # Also do not profile any debug utilities CFLAGS_REMOVE_spinlock_debug.o = -pg CFLAGS_REMOVE_list_debug.o = -pg CFLAGS_REMOVE_debugobjects.o = -pg CFLAGS_REMOVE_find_next_bit.o = -pg CFLAGS_REMOVE_cpumask.o = -pg CFLAGS_REMOVE_bitmap.o = -pg endif ... and the pattern has been that random library functionality showed up in ftrace's critical path (outside of its recursion check), causing hard to debug lockups. So be a bit defensive about it and exclude all lib/*.o functions by default. It's not that they are overly interesting for tracing purposes anyway. Specific ones can still be traced, in an opt-in manner. Signed-off-by: Ingo Molnar <mingo@elte.hu>
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17
lib/Makefile
17
lib/Makefile
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@ -2,24 +2,17 @@
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# Makefile for some libs needed in the kernel.
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#
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ifdef CONFIG_FTRACE
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ORIG_CFLAGS := $(KBUILD_CFLAGS)
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KBUILD_CFLAGS = $(subst -pg,,$(ORIG_CFLAGS))
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endif
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lib-y := ctype.o string.o vsprintf.o cmdline.o \
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rbtree.o radix-tree.o dump_stack.o \
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idr.o int_sqrt.o extable.o prio_tree.o \
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sha1.o irq_regs.o reciprocal_div.o argv_split.o \
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proportions.o prio_heap.o ratelimit.o
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ifdef CONFIG_FTRACE
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# Do not profile string.o, since it may be used in early boot or vdso
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CFLAGS_REMOVE_string.o = -pg
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# Also do not profile any debug utilities
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CFLAGS_REMOVE_spinlock_debug.o = -pg
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CFLAGS_REMOVE_list_debug.o = -pg
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CFLAGS_REMOVE_debugobjects.o = -pg
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CFLAGS_REMOVE_find_next_bit.o = -pg
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CFLAGS_REMOVE_cpumask.o = -pg
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CFLAGS_REMOVE_bitmap.o = -pg
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endif
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lib-$(CONFIG_MMU) += ioremap.o
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lib-$(CONFIG_SMP) += cpumask.o
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