path: root/Makefile
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authorArnd Bergmann <arnd@arndb.de>2016-04-25 17:35:28 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-30 10:18:35 +0200
commit605623774e714a460bec332d81ab3da194a26ae3 (patch)
tree17010faf8f7688f89fe32f51107de38854a19a71 /Makefile
parentd772ec1314f80de536aafc729855bcf3e691f997 (diff)
Kbuild: disable 'maybe-uninitialized' warning for CONFIG_PROFILE_ALL_BRANCHES
commit 815eb71e7149ecce40db9dd0ad09c4dd9d33c60f upstream. CONFIG_PROFILE_ALL_BRANCHES confuses gcc-5.x to the degree that it prints incorrect warnings about a lot of variables that it thinks can be used uninitialized, e.g.: i2c/busses/i2c-diolan-u2c.c: In function 'diolan_usb_xfer': i2c/busses/i2c-diolan-u2c.c:391:16: warning: 'byte' may be used uninitialized in this function iio/gyro/itg3200_core.c: In function 'itg3200_probe': iio/gyro/itg3200_core.c:213:6: warning: 'val' may be used uninitialized in this function leds/leds-lp55xx-common.c: In function 'lp55xx_update_bits': leds/leds-lp55xx-common.c:350:6: warning: 'tmp' may be used uninitialized in this function misc/bmp085.c: In function 'show_pressure': misc/bmp085.c:363:10: warning: 'pressure' may be used uninitialized in this function power/ds2782_battery.c: In function 'ds2786_get_capacity': power/ds2782_battery.c:214:17: warning: 'raw' may be used uninitialized in this function These are all false positives that either rob someone's time when trying to figure out whether they are real, or they get people to send wrong patches to shut up the warnings. Nobody normally wants to run a CONFIG_PROFILE_ALL_BRANCHES kernel in production, so disabling the whole class of warnings for this configuration has no serious downsides either. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Steven Rostedt <rostedtgoodmis.org> Signed-off-by: Michal Marek <mmarek@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Makefile')
1 files changed, 5 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 05d83a80464f..d10cd0965388 100644
--- a/Makefile
+++ b/Makefile
@@ -620,7 +620,11 @@ KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
+KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
# Tell gcc to never replace conditional load with a non-conditional one