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| author | Steven Rostedt <srostedt@redhat.com> | 2011-04-12 18:59:10 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2011-05-17 10:41:49 -0400 |
| commit | a3a8350ab2f588f3a7a08dc86658bf90773f9a52 (patch) | |
| tree | 723c1381ccff878bbf2302afbb6b1f84a4b34513 | |
| parent | 06fd6f6301cce9af4a03dd9e40bfca167e931ff1 (diff) | |
| download | lwn-a3a8350ab2f588f3a7a08dc86658bf90773f9a52.tar.gz lwn-a3a8350ab2f588f3a7a08dc86658bf90773f9a52.zip | |
kbuild/recordmcount: Add RECORDMCOUNT_WARN to warn about mcount callers
When mcount is called in a section that ftrace will not modify it into
a nop, we want to warn about this. But not warn about this always. Now
if the user builds the kernel with the option RECORDMCOUNT_WARN=1 then
the build will warn about mcount callers that are ignored and will just
waste execution time.
Acked-by: Michal Marek <mmarek@suse.cz>
Cc: linux-kbuild@vger.kernel.org
Link: http://lkml.kernel.org/r/20110421023738.714956282@goodmis.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| -rw-r--r-- | Makefile | 1 | ||||
| -rw-r--r-- | scripts/Makefile.build | 5 |
2 files changed, 5 insertions, 1 deletions
@@ -1268,6 +1268,7 @@ help: @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' @echo ' make C=2 [targets] Force check of all c source with $$CHECK' @echo ' make W=1 [targets] Enable extra gcc checks' + @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' @echo '' @echo 'Execute "make" or "make all" to build all targets marked with [*] ' @echo 'For further info see the ./README file' diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 7d3f9036eee2..6165622c3e29 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -244,13 +244,16 @@ endif ifdef CONFIG_FTRACE_MCOUNT_RECORD ifdef BUILD_C_RECORDMCOUNT +ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") + RECORDMCOUNT_FLAGS = -w +endif # Due to recursion, we must skip empty.o. # The empty.o file is created in the make process in order to determine # the target endianness and word size. It is made before all other C # files, including recordmcount. sub_cmd_record_mcount = \ if [ $(@) != "scripts/mod/empty.o" ]; then \ - $(objtree)/scripts/recordmcount "$(@)"; \ + $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ fi; recordmcount_source := $(srctree)/scripts/recordmcount.c \ $(srctree)/scripts/recordmcount.h |