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Groups > linux.kernel > #1332844
| From | Arnd Bergmann <arnd@arndb.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 4/5] gcov: disable tree-loop-im to reduce stack usage |
| Date | 2016-02-12 17:10 +0100 |
| Message-ID | <r1osa-Pl-19@gated-at.bofh.it> (permalink) |
| References | <r1os9-Pl-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Enabling CONFIG_GCOV_PROFILE_ALL produces us a lot of warnings like lib/lz4/lz4hc_compress.c: In function 'lz4_compresshcctx': lib/lz4/lz4hc_compress.c:514:1: warning: the frame size of 1504 bytes is larger than 1024 bytes [-Wframe-larger-than=] After some investigation, I found that this behavior started with gcc-4.9, and opened https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69702. A suggested workaround for it is to use the -fno-tree-loop-im flag that turns off one of the optimization stages in gcc, so the code runs a little slower but does not use excessive amounts of stack. We could make this conditional on the gcc version, but I could not find an easy way to do this in Kbuild and the benefit would be fairly small, given that most of the gcc version in production are affected now. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 352f55ccc54e..6bb89728a9d1 100644 --- a/Makefile +++ b/Makefile @@ -364,7 +364,7 @@ AFLAGS_MODULE = LDFLAGS_MODULE = CFLAGS_KERNEL = AFLAGS_KERNEL = -CFLAGS_GCOV = -fprofile-arcs -ftest-coverage +CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im CFLAGS_KCOV = -fsanitize-coverage=trace-pc -- 2.7.0
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[PATCH 0/5] gcov fixes and maybe-uninitialized warnings Arnd Bergmann <arnd@arndb.de> - 2016-02-12 17:10 +0100
[PATCH 5/5] gcov: disable -Wmaybe-uninitialized warning Arnd Bergmann <arnd@arndb.de> - 2016-02-12 17:10 +0100
Re: [PATCH 5/5] gcov: disable -Wmaybe-uninitialized warning Peter Oberparleiter <oberpar@linux.vnet.ibm.com> - 2016-02-15 15:40 +0100
[PATCH 2/5] Kbuild: disable 'maybe-uninitialized' warning for CONFIG_PROFILE_ALL_BRANCHES Arnd Bergmann <arnd@arndb.de> - 2016-02-12 17:10 +0100
Re: [PATCH 2/5] Kbuild: disable 'maybe-uninitialized' warning for CONFIG_PROFILE_ALL_BRANCHES Steven Rostedt <rostedt@goodmis.org> - 2016-02-15 18:50 +0100
[PATCH 4/5] gcov: disable tree-loop-im to reduce stack usage Arnd Bergmann <arnd@arndb.de> - 2016-02-12 17:10 +0100
Re: [PATCH 4/5] gcov: disable tree-loop-im to reduce stack usage Peter Oberparleiter <oberpar@linux.vnet.ibm.com> - 2016-02-15 15:40 +0100
[PATCH 1/5] Kbuild: change CC_OPTIMIZE_FOR_SIZE definition Arnd Bergmann <arnd@arndb.de> - 2016-02-12 17:10 +0100
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