Eric Lee / smarc-fsl-linux-kernel

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Commit 3594136ad67a54d77bcb2547e70011754a2f91d5

Authored by Steven Rostedt
Committed by Thomas Gleixner
1 parent caf8cdebfb

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>

Showing 1 changed file with 8 additions and 0 deletions Side-by-side Diff

... ... @@ -8,6 +8,14 @@
8 8 sha1.o irq_regs.o reciprocal_div.o argv_split.o \
9 9 proportions.o prio_heap.o ratelimit.o
10 10  
  11 +ifdef CONFIG_FTRACE
  12 +# Do not profile string.o, since it may be used in early boot or vdso
  13 +ORIG_CFLAGS := $(KBUILD_CFLAGS)
  14 +KBUILD_CFLAGS = $(if $(subst string,,$(basename $(notdir $@))), \
  15 + $(ORIG_CFLAGS), \
  16 + $(subst -pg,,$(ORIG_CFLAGS)))
  17 +endif
  18 +
11 19 lib-$(CONFIG_MMU) += ioremap.o
12 20 lib-$(CONFIG_SMP) += cpumask.o
13 21