Steven Rostedt
68eb1d2e53
ftrace/recordmcount: Make ignored mcount calls into nops at compile time ...
There are sections that are ignored by ftrace for the function tracing because
the text is in a section that can be removed without notice. The mcount calls
in these sections are ignored and ftrace never sees them. The downside of this
is that the functions in these sections still call mcount. Although the mcount
function is defined in assembly simply as a return, this added overhead is
unnecessary.
The solution is to convert these callers into nops at compile time.
A better solution is to add 'notrace' to the section markers, but as new sections
come up all the time, it would be nice that they are delt with when they
are created.
Later patches will deal with finding these sections and doing the proper solution.
Thanks to H. Peter Anvin for giving me the right nops to use for x86.
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: John Reiser <jreiser@bitwagon.com>
Link: http://lkml.kernel.org/r/20110421023738.237101176@goodmis.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2011-05-17 10:41:42 -04:00
kbuild: Fix computing srcversion for modules
2011-03-13 15:59:58 -07:00
scripts/coccinelle: update for compatability with Coccinelle 0.2.4
2010-12-03 12:27:01 +01:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
genksyms: Regenerate lexer and parser
2011-03-17 15:13:56 +01:00
kconfig: Avoid buffer underrun in choice input
2011-04-24 08:24:31 -07:00
Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6
2011-03-21 15:55:26 -07:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
SELinux: Auto-generate security_is_socket_class
2011-03-03 15:19:43 -05:00
tracing, perf: Convert the power tracer into an event tracer
2009-09-19 11:42:12 +02:00
gitignore: add scripts/recordmcount
2010-11-25 15:49:50 +01:00
bloat-o-meter: include read-only data section in report
2011-03-22 17:44:17 -07:00
bootgraph: fix for use with dot symbols
2009-02-15 12:50:08 +01:00
checkincludes: fix perlcritic warnings
2010-03-07 21:19:57 +01:00
checkkconfigsymbols.sh: Kconfig symbols sometimes have lowercase letters
2010-06-03 10:39:39 +02:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
scripts: improve checkstack
2010-03-07 21:19:09 +01:00
checksyscalls: Fix stand-alone usage
2010-12-20 15:40:33 +01:00
checkversion: perl cleanup
2010-03-07 21:22:56 +01:00
Coccinelle: Add contextual message
2010-10-28 00:32:23 +02:00
kbuild: add numeric --set-val option to scripts/config
2010-12-15 15:44:31 +01:00
Fix all -Wmissing-prototypes warnings in x86 defconfig
2009-09-23 07:39:28 -07:00
scripts: decodecode: remove bashisms
2010-06-04 10:26:35 +02:00
export_report: fix perl warnings
2010-03-07 21:41:04 +01:00
scripts/extract-ikconfig: add xz compression support
2011-02-10 15:23:03 +01:00
jump label: Fix GCC feature check when distcc is used
2010-09-24 09:12:25 +02:00
Remove bashisms from scripts
2009-06-09 22:37:54 +02:00
stackprotector: fix multi-word cross-builds
2009-02-11 12:17:29 +01:00
stackprotector: fix multi-word cross-builds
2009-02-11 12:17:29 +01:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
get_maintainer.pl: allow "K:" pattern tests to match non-patch text
2011-03-22 17:44:13 -07:00
scripts: fix gfp-translate for recent changes to gfp.h
2010-11-25 06:50:49 +09:00
headerdep: perlcritic warning
2010-03-23 12:26:38 +01:00
kbuild: introduce HDR_ARCH_LIST for headers_install_all
2010-12-14 22:16:19 +01:00
headers_check: Fix warning text
2010-12-14 17:05:08 +01:00
headers_install: check exit status of unifdef
2010-12-14 15:06:04 +01:00
scripts/kallsyms: Enable error messages while hush up unnecessary warnings
2010-09-29 16:18:27 +02:00
kbuild: generate modules.builtin
2009-12-12 13:08:16 +01:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
KBuild: silence "'scripts/unifdef' is up to date."
2011-03-17 12:29:20 +01:00
ftrace/kbuild: Add recordmcount files to force full build
2011-05-17 10:41:08 -04:00
kbuild: Really don't clean bounds.h and asm-offsets.h
2010-03-11 11:15:22 +01:00
kbuild: drop unifdef-y support
2010-08-14 22:26:52 +02:00
Add a target to use the Coccinelle checker
2010-06-12 00:00:29 +02:00
decompressors: add XZ decompressor module
2011-01-13 08:03:24 -08:00
kbuild: Create output directory in Makefile.modbuiltin
2010-06-10 12:23:08 +02:00
Revert "kbuild: strip generated symbols from *.ko"
2009-01-14 21:38:20 +01:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
Merge branch 'for-35' of git://repo.or.cz/linux-kbuild
2010-06-01 08:55:52 -07:00
scripts/mkcompile_h: don't test for hardcoded paths
2010-02-02 14:33:56 +01:00
fixes for using make 3.82
2010-08-17 11:47:40 +02:00
Revert "kbuild: strip generated symbols from *.ko"
2009-01-14 21:38:20 +01:00
mkuboot.sh: Fail if mkimage is missing
2011-01-07 14:31:01 +01:00
linker script: throw away .discard section
2009-06-24 15:13:38 +09:00
Revert "namespace: add source file location exceptions"
2010-10-28 00:59:56 +02:00
fbdev: work around old compiler bug
2009-06-30 18:55:59 -07:00
profile2linkerlist: fix perl warnings
2010-03-07 21:39:33 +01:00
ftrace/recordmcount: Make ignored mcount calls into nops at compile time
2011-05-17 10:41:42 -04:00
ftrace/recordmcount: Make ignored mcount calls into nops at compile time
2011-05-17 10:41:42 -04:00
ftrace: Add .kprobe.text section to whitelist for recordmcount.c
2011-05-17 10:41:36 -04:00
setlocalversion: update mercurial tag parsing
2011-01-15 00:40:44 +01:00
scripts: change scripts to use system python instead of env
2010-02-02 14:33:56 +01:00
Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6
2011-03-20 18:13:09 -07:00
unifdef: update to upstream version 2.5
2011-01-22 15:50:59 +01:00
Remove bashisms from scripts
2009-06-09 22:37:54 +02:00
decompressors: add XZ decompressor module
2011-01-13 08:03:24 -08:00
68eb1d2e53