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Message-ID: <201503021114.KsEpH21F%fengguang.wu@intel.com>
Date: Mon, 2 Mar 2015 11:49:23 +0800
From: kbuild test robot <fengguang.wu@...el.com>
To: Nick Meier <nmeier@...rosoft.com>
Cc: kbuild-all@...org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
devel@...uxdriverproject.org, linux-kernel@...r.kernel.org
Subject: [char-misc:char-misc-testing 25/45] drivers/hv/vmbus_drv.c:67:9:
sparse: constant 0x8000000000000000 is so big it is unsigned long
tree: git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git char-misc-testing
head: b3de8e3719e582f3182bb504295e4a8e43c8c96f
commit: 96c1d0581d00f7abe033350edb021a9d947d8d81 [25/45] Drivers: hv: vmbus: Add support for VMBus panic notifier handler
reproduce:
# apt-get install sparse
git checkout 96c1d0581d00f7abe033350edb021a9d947d8d81
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
>> drivers/hv/vmbus_drv.c:67:9: sparse: constant 0x8000000000000000 is so big it is unsigned long
>> drivers/hv/vmbus_drv.c:67:9: sparse: constant 0x8000000000000000 is so big it is unsigned long
>> drivers/hv/vmbus_drv.c:51:5: sparse: symbol 'hyperv_panic_event' was not declared. Should it be static?
>> drivers/hv/vmbus_drv.c:67:9: sparse: cast truncates bits from constant value (8000000000000000 becomes 0)
Please review and possibly fold the followup patch.
vim +67 drivers/hv/vmbus_drv.c
45
46 static struct tasklet_struct msg_dpc;
47 static struct completion probe_event;
48 static int irq;
49
50
> 51 int hyperv_panic_event(struct notifier_block *nb,
52 unsigned long event, void *ptr)
53 {
54 struct pt_regs *regs;
55
56 regs = current_pt_regs();
57
58 wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip);
59 wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax);
60 wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx);
61 wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx);
62 wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx);
63
64 /*
65 * Let Hyper-V know there is crash data available
66 */
> 67 wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY);
68 return NOTIFY_DONE;
69 }
70
---
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