drivers/scsi/mpt3sas/mpt3sas_scsih.o: warning: objtool: mpt3sas_scsih_event_callback()+0x105b: function has unreachable instruction

From: kbuild test robot
Date: Mon Mar 28 2016 - 22:58:56 EST


Hi Josh,

First bad commit (maybe != root cause):

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 1993b176a8224e371e0732ffada7ab9eb3b0912b
commit: c1d45c3abd49b5bf9447e435099c1b000dcde752 objtool: Support CROSS_COMPILE
date: 4 weeks ago
config: x86_64-randconfig-s2-03291000 (attached as .config)
reproduce:
git checkout c1d45c3abd49b5bf9447e435099c1b000dcde752
# save the attached .config to linux build tree
make ARCH=x86_64

All warnings (new ones prefixed by >>):

In file included from include/linux/kernel.h:13:0,
from include/linux/list.h:8,
from include/linux/module.h:9,
from drivers/scsi/mpt3sas/mpt3sas_scsih.c:45:
drivers/scsi/mpt3sas/mpt3sas_scsih.c: In function '_firmware_event_work':
include/linux/printk.h:259:2: warning: 'query_count' may be used uninitialized in this function [-Wmaybe-uninitialized]
printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
^
drivers/scsi/mpt3sas/mpt3sas_scsih.c:5828:6: note: 'query_count' was declared here
u32 query_count;
^
In file included from include/linux/kernel.h:13:0,
from include/linux/list.h:8,
from include/linux/module.h:9,
from drivers/scsi/mpt3sas/mpt3sas_scsih.c:45:
include/linux/printk.h:259:2: warning: 'termination_count' may be used uninitialized in this function [-Wmaybe-uninitialized]
printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
^
drivers/scsi/mpt3sas/mpt3sas_scsih.c:5827:6: note: 'termination_count' was declared here
u32 termination_count;
^
>> drivers/scsi/mpt3sas/mpt3sas_scsih.o: warning: objtool: mpt3sas_scsih_event_callback()+0x105b: function has unreachable instruction
drivers/scsi/mpt3sas/mpt3sas_scsih.o: warning: objtool: mpt3sas_scsih_event_callback()+0x105e: function has unreachable instruction
drivers/scsi/mpt3sas/mpt3sas_scsih.o: warning: objtool: mpt3sas_scsih_event_callback()+0x1060: function has unreachable instruction
drivers/scsi/mpt3sas/mpt3sas_scsih.o: warning: objtool: mpt3sas_scsih_event_callback()+0x1064: function has unreachable instruction
drivers/scsi/mpt3sas/mpt3sas_scsih.o: warning: objtool: mpt3sas_scsih_event_callback()+0x106a: function has unreachable instruction
drivers/scsi/mpt3sas/mpt3sas_scsih.o: warning: objtool: mpt3sas_scsih_event_callback()+0x106d: function has unreachable instruction
drivers/scsi/mpt3sas/mpt3sas_scsih.o: warning: objtool: mpt3sas_scsih_event_callback()+0x1074: function has unreachable instruction
drivers/scsi/mpt3sas/mpt3sas_scsih.o: warning: objtool: mpt3sas_scsih_event_callback()+0x1079: function has unreachable instruction

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