lib: remove redundant ftrace flag removal

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  • lib: remove redundant ftrace flag removal
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Commit Message

Mark Rutland Aug. 6, 2019, 4:25 p.m.
Since architectures can implement ftrace using a variety of mechanisms,
generic code should always use CC_FLAGS_FTRACE rather than assuming that
ftrace is built using -pg.

Since commit:

  2464a609ded09420 ("ftrace: do not trace library functions")

... lib/Makefile has removed CC_FLAGS_FTRACE from KBUILD_CFLAGS, so ftrace is
disabled for all files under lib/.

Given that, we shouldn't explicitly remove -pg when building
lib/string.o, as this is redundant and bad form.

This patch cleans things up accordingly.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <>

Cc: Andrew Morton <>
Cc: Borislav Petkov <>
Cc: Gary R Hook <>
Cc: Ingo Molnar <>
 lib/Makefile | 4 ----
 1 file changed, 4 deletions(-)

I've verified this atop of v5.3-rc3, where the Makefile removes all of
CC_FLAGS_FTRACE (containing "-pg -mrecord-mcount -mfentry") from the CFLAGS for
building string.o




diff --git a/lib/Makefile b/lib/Makefile
index 29c02a924973..c5892807e06f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -21,10 +21,6 @@  KCOV_INSTRUMENT_dynamic_debug.o := n
 KASAN_SANITIZE_string.o := n
-CFLAGS_REMOVE_string.o = -pg
 CFLAGS_string.o := $(call cc-option, -fno-stack-protector)