linux-kernel - [PATCH 4.9 001/101] Kbuild: suppress packed-not-aligned warning for default setting only

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Message-Id: <20181206143011.481021359@linuxfoundation.org>
Date:   Thu,  6 Dec 2018 15:38:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xiongfeng Wang <xiongfeng.wang@...aro.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: [PATCH 4.9 001/101] Kbuild: suppress packed-not-aligned warning for default setting only

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Xiongfeng Wang <xiongfeng.wang@...aro.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@...aro.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -10,6 +10,8 @@
 # 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
@@ -25,6 +27,7 @@ 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)