Josh Poimboeuf
3f135e57a4
x86/build: Mostly disable '-maccumulate-outgoing-args' ...
The GCC '-maccumulate-outgoing-args' flag is enabled for most configs,
mostly because of issues which are no longer relevant. For most
configs, and with most recent versions of GCC, it's no longer needed.
Clarify which cases need it, and only enable it for those cases. Also
produce a compile-time error for the ftrace graph + mcount + '-Os' case,
which will otherwise cause runtime failures.
The main benefit of '-maccumulate-outgoing-args' is that it prevents an
ugly prologue for functions which have aligned stacks. But removing the
option also has some benefits: more readable argument saves, smaller
text size, and (presumably) slightly improved performance.
Here are the object size savings for 32-bit and 64-bit defconfig
kernels:
text data bss dec hex filename
10006710 3543328 1773568 15323606 e9d1d6 vmlinux.x86-32.before
9706358 3547424 1773568 15027350 e54c96 vmlinux.x86-32.after
text data bss dec hex filename
10652105 4537576 843776 16033457 f4a6b1 vmlinux.x86-64.before
10639629 4537576 843776 16020981 f475f5 vmlinux.x86-64.after
That comes out to a 3% text size improvement on x86-32 and a 0.1% text
size improvement on x86-64.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andrew Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170316193133.zrj6gug53766m6nn@treble
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-03-30 11:53:04 +02:00
fixdep: faster CONFIG_ search
2016-08-24 22:34:19 +02:00
Coccinelle: misc: Add support for devm variant in all modes
2016-12-11 12:08:26 +01:00
scripts/dtc: Update to upstream version 0931cea3ba20
2017-01-04 10:47:53 -06:00
Fixes a typo in sancov plugin, exposed in earlier compiler versions
2017-03-09 18:05:41 -08:00
Revert "scripts/gdb: add a Radix Tree Parser"
2016-07-15 14:54:27 +09:00
kbuild: modversions: add infrastructure for emitting relative CRCs
2017-02-03 08:28:25 -08:00
Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
2016-12-17 16:30:24 -08:00
objtool, modules: Discard objtool annotation sections for modules
2017-03-01 20:32:25 +01:00
Merge branch 'kbuild/rc-fixes' into kbuild/misc
2016-12-11 21:20:34 +01:00
selinux: use the kernel headers when building scripts/selinux
2016-12-21 10:39:25 -05:00
ftrace/scripts: Add helper script to bisect function tracing problem functions
2016-09-21 13:56:55 -04:00
KEYS: Reserve an extra certificate symbol for inserting without recompiling
2016-02-26 15:30:20 +00:00
kbuild: fix scripts/adjust_autoksyms.sh* for the no modules case
2016-12-11 22:30:10 +01:00
AnalyzeSuspend: fix drag and zoom bug in javascript
2017-02-16 00:52:35 +01:00
ASN.1: fix open failure check on headername
2016-04-06 14:06:48 +01:00
scripts/bloat-o-meter: compile .NUMBER regex
2016-12-12 18:55:06 -08:00
scripts: add a script to check if Documentation/00-INDEX is sane
2016-12-05 14:21:24 -07:00
scripts/checkincludes.pl: add exit message for no duplicates found
2017-02-22 16:41:26 -08:00
checkkconfigsymbols.py: support Kconfig's 'imply' statement
2017-02-03 11:49:06 +01:00
checkpatch: warn when formats use %Z and suggest %z
2017-02-27 18:43:48 -08:00
OpenRISC updates for 4.11
2017-02-24 18:37:03 -08:00
scripts/coccicheck: Update reference for the corresponding documentation
2016-10-11 09:50:43 +02:00
const_structs.checkpatch: add frequently used from Julia Lawall's list
2016-10-11 15:06:30 -07:00
scripts/decode_stacktrace.sh: Fix address line detection on x86
2016-11-29 14:19:50 +01:00
docproc: print a comment about autogeneration for rst output
2016-05-14 09:56:56 -06:00
KEYS: Provide a script to extract a module signature
2015-10-21 15:18:36 +01:00
KEYS: Use the symbol value for list size, updated by scripts/insert-sys-cert
2016-02-26 15:32:05 +00:00
[media] extract_xc3028.pl: move it to scripts/dir
2016-07-17 14:08:12 -03:00
scripts/faddr2line: Fix "size mismatch" error
2016-10-25 18:40:37 +02:00
gcc-plugins: abort builds cleanly when not supported
2016-08-08 17:49:05 -07:00
scripts/has-stack-protector: add -fno-PIE
2016-11-09 22:28:05 +01:00
initramfs: Escape colons in depfile
2016-09-23 10:35:32 +02:00
[media] doc-rst: move DVB avulse docs to Documentation/media
2016-07-17 14:02:45 -03:00
get_maintainer: look for arbitrary letter prefixes in sections
2016-12-12 18:55:09 -08:00
headers_check: don't warn about c++ guards
2016-05-24 14:12:48 +10:00
KEYS: Reserve an extra certificate symbol for inserting without recompiling
2016-02-26 15:30:20 +00:00
kbuild: modversions: add infrastructure for emitting relative CRCs
2017-02-03 08:28:25 -08:00
x86/build: Mostly disable '-maccumulate-outgoing-args'
2017-03-30 11:53:04 +02:00
kernel-doc: Handle returning pointers to pointers
2017-01-26 15:20:10 -07:00
ld-version: Drop the 4th and 5th version components
2016-05-13 14:02:05 +02:00
scripts/Lindent: clean up and optimize
2017-02-22 16:41:26 -08:00
kbuild: minor improvement for thin archives build
2016-11-29 15:58:57 +01:00
GCC plugin infrastructure
2016-06-07 22:57:10 +02:00
kbuild: Remove stale asm-generic wrappers
2016-07-07 15:58:45 +02:00
kbuild: modversions: add infrastructure for emitting relative CRCs
2017-02-03 08:28:25 -08:00
Shared library support
2016-06-07 22:57:10 +02:00
dtbsinstall: don't move target directory out of the way
2016-01-28 11:40:32 +01:00
Kbuild: enable -Wmaybe-uninitialized warnings by default
2016-11-11 08:45:08 -08:00
powerpc updates for 4.11 part 1.
2017-02-22 10:30:38 -08:00
Shared library support
2016-06-07 22:57:10 +02:00
kasan: turn on -fsanitize-address-use-after-scope
2016-12-12 18:55:09 -08:00
Merge branch 'akpm' (patches from Andrew)
2016-08-02 21:08:07 -04:00
kbuild: add arch specific post-link Makefile
2016-09-09 10:47:00 +02:00
Kbuild: enable -Wmaybe-uninitialized warning for "make W=1"
2016-11-11 08:45:08 -08:00
There was some breakage with the changes for jump labels in the 4.11 merge
2017-03-07 09:37:28 -08:00
kallsyms: add support for relative offsets in kallsyms address table
2016-03-15 16:55:16 -07:00
scripts: add "prune-kernel" script to clean up old kernel images
2016-02-09 10:09:52 -08:00
recordmcount: arm: Implement make_nop
2016-11-14 16:43:00 -05:00
recordmcount: Fix endianness handling bug for nop_mcount
2015-11-03 10:45:26 -05:00
scripts/spelling.txt: add "swith" pattern and fix typo instances
2017-02-27 18:43:46 -08:00
kbuild: setlocalversion: print error to STDERR
2016-06-20 17:37:45 +02:00
sign-file: fix build error in sign-file.c with libressl
2017-02-10 12:43:47 +11:00
powerpc: Build-time sort the exception table
2016-11-14 11:11:51 +11:00
scripts/spelling.txt: add "overide" pattern and fix typo instances
2017-03-09 17:01:09 -08:00
scripts/tags.sh: include arch/Kconfig* for tags generation
2017-02-22 16:41:26 -08:00
ver_linux: rename ver_linux.awk to ver_linux
2016-08-31 13:59:31 +02:00
3f135e57a4