[PATCH 4.14 01/55] Kbuild: suppress packed-not-aligned warning for default setting only

Greg Kroah-Hartman
2018-12-06T14:59:03Z

From: Xiongfeng Wang <xiongfeng.wang@linaro.org>

commit 321cb0308a9e76841394b4bbab6a1107cfedbae0 upstream.

gcc-8 reports many -Wpacked-not-aligned warnings. The below are some
examples.

./include/linux/ceph/msgr.h:67:1: warning: alignment 1 of 'struct
ceph_entity_addr' is less than 8 [-Wpacked-not-aligned]
} __attribute__ ((packed));

./include/linux/ceph/msgr.h:67:1: warning: alignment 1 of 'struct
ceph_entity_addr' is less than 8 [-Wpacked-not-aligned]
} __attribute__ ((packed));

./include/linux/ceph/msgr.h:67:1: warning: alignment 1 of 'struct
ceph_entity_addr' is less than 8 [-Wpacked-not-aligned]
} __attribute__ ((packed));

This patch suppresses this kind of warnings for default setting.

Signed-off-by: Xiongfeng Wang <xiongfeng.wang@linaro.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
scripts/Makefile.extrawarn | 3 +++
1 file changed, 3 insertions(+)

--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -11,6 +11,8 @@
# are not supported by all versions of the compiler
# ==========================================================================

+KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
+
ifeq ("$(origin W)", "command line")
export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
endif
@@ -26,6 +28,7 @@ warning-1 += -Wold-style-definition
warning-1 += $(call cc-option, -Wmissing-include-dirs)
warning-1 += $(call cc-option, -Wunused-but-set-variable)
warning-1 += $(call cc-option, -Wunused-const-variable)
+warning-1 += $(call cc-option, -Wpacked-not-aligned)
warning-1 += $(call cc-disable-warning, missing-field-initializers)
warning-1 += $(call cc-disable-warning, sign-compare)