Messages in this thread | | | Date | Wed, 20 Jul 2016 11:06:19 +0800 | From | Fengguang Wu <> | Subject | Re: [kbuild-all] [PATCH v17 net-next 1/1] hv_sock: introduce Hyper-V Sockets |
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On Tue, Jul 19, 2016 at 07:52:53PM -0700, David Miller wrote: >From: Dexuan Cui <decui@microsoft.com> >Date: Wed, 20 Jul 2016 01:48:18 +0000 > >>> From: kbuild test robot [mailto:lkp@intel.com] >>> Sent: Wednesday, July 20, 2016 1:10 >>> >>> Hi, >>> >>> [auto build test WARNING on net-next/master] >>> >>> url: https://github.com/0day-ci/linux/commits/Dexuan-Cui/introduce- >>> Hyper-V-VM-Sockets-hv_sock/20160715-223433 >>> config: x86_64-randconfig-a0-07191719 (attached as .config) >>> compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7 >>> reproduce: >>> # save the attached .config to linux build tree >>> make ARCH=x86_64 >>> >>> All warnings (new ones prefixed by >>): >>> >>> net/hv_sock/af_hvsock.c: In function 'hvsock_open_connection': >>> net/hv_sock/af_hvsock.c:693: warning: 'hvsk' may be used uninitialized in >>> this function >>> net/hv_sock/af_hvsock.c:693: warning: 'new_hvsk' may be used >>> uninitialized in this function >>> net/hv_sock/af_hvsock.c:697: warning: 'new_sk' may be used uninitialized >>> in this function >>> net/hv_sock/af_hvsock.c: In function 'hvsock_sendmsg_wait': >>> net/hv_sock/af_hvsock.c:1053: warning: 'ret' may be used uninitialized in >>> this function >>> >> net/hv_sock/af_hvsock.o: warning: objtool: hvsock_on_channel_cb()+0x1d: >>> function has unreachable instruction >> >> These warnings are all false alarms. > >But you still have to quiet them.
Agreed.
However the last warning
objtool: hvsock_on_channel_cb()+0x1d: function has unreachable instruction
is my fault -- it turns out to be a problem with old gcc-4.4 and gcc-4.6 which we enabled 2 days ago. I just disabled reporting this odd warning because it complaints on ~10000 functions all over the place, which can only be sanely fixed in the toolchain.
Thanks, Fengguang
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