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| author | Andi Kleen <ak@linux.intel.com> | 2017-11-28 00:34:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-23 15:59:17 +0300 |
| commit | 6b6810c2a4129b508649888a98ce925caeac9fdd (patch) | |
| tree | 0fdf7add70b48e9994319eb82b96ca41f53a855b /scripts | |
| parent | d10795e33bce1b2530a5106d3d1e91b1f7a76e6f (diff) | |
| download | linux-6b6810c2a4129b508649888a98ce925caeac9fdd.tar.xz | |
trace: Use -mcount-record for dynamic ftrace
commit 96f60dfa5819a065bfdd2f2ba0df7d9cbce7f4dd upstream.
gcc 5 supports a new -mcount-record option to generate ftrace
tables directly. This avoids the need to run record_mcount
manually.
Use this option when available.
So far doesn't use -mcount-nop, which also exists now.
This is needed to make ftrace work with LTO because the
normal record-mcount script doesn't run over the link
time output.
It should also improve build times slightly in the general
case.
Link: http://lkml.kernel.org/r/20171127213423.27218-12-andi@firstfloor.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/Makefile.build | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 6228a83156ea..9f27891fba86 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -222,6 +222,11 @@ cmd_modversions_c = \ endif ifdef CONFIG_FTRACE_MCOUNT_RECORD +# gcc 5 supports generating the mcount tables directly +ifneq ($(call cc-option,-mrecord-mcount,y),y) +KBUILD_CFLAGS += -mrecord-mcount +else +# else do it all manually ifdef BUILD_C_RECORDMCOUNT ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") RECORDMCOUNT_FLAGS = -w @@ -264,6 +269,7 @@ endif ifdef CONFIG_GCOV_KERNEL objtool_args += --no-unreachable endif +endif # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file |