arch/x86/include/asm/preempt.h:75:9: sparse: context imbalance in 'vcpu_enter_guest' - unexpected unlock

From: kbuild test robot
Date: Tue May 09 2017 - 08:32:50 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 2868b2513aa732a99ea4a0a6bf10dc93c1f3dac2
commit: bd7e5b0899a429445cc6e3037c13f8b5ae3be903 KVM: x86: remove code for lazy FPU handling
date: 3 months ago
reproduce:
# apt-get install sparse
git checkout bd7e5b0899a429445cc6e3037c13f8b5ae3be903
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__

sparse warnings: (new ones prefixed by >>)

arch/x86/kvm/x86.c:2063:38: sparse: incorrect type in argument 1 (different address spaces)
arch/x86/kvm/x86.c:2063:38: expected void const [noderef] <asn:1>*<noident>
arch/x86/kvm/x86.c:2063:38: got unsigned char [usertype] *
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
arch/x86/include/asm/uaccess.h:714:18: sparse: incorrect type in argument 1 (different modifiers)
arch/x86/include/asm/uaccess.h:714:18: expected void *<noident>
arch/x86/include/asm/uaccess.h:714:18: got void const *from
./arch/x86/kvm/trace.h:63:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:378:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:497:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:763:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:763:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:814:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:814:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:836:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:886:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:972:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:997:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:1102:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:1127:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:1153:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:1322:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
./arch/x86/kvm/trace.h:1322:1: sparse: odd constant _Bool cast (ffffffffffffffff becomes 1)
>> arch/x86/include/asm/preempt.h:75:9: sparse: context imbalance in 'vcpu_enter_guest' - unexpected unlock

vim +/vcpu_enter_guest +75 arch/x86/include/asm/preempt.h

c2daa3be Peter Zijlstra 2013-08-14 59 static __always_inline void clear_preempt_need_resched(void)
c2daa3be Peter Zijlstra 2013-08-14 60 {
b3ca1c10 Christoph Lameter 2014-04-07 61 raw_cpu_or_4(__preempt_count, PREEMPT_NEED_RESCHED);
c2daa3be Peter Zijlstra 2013-08-14 62 }
c2daa3be Peter Zijlstra 2013-08-14 63
c2daa3be Peter Zijlstra 2013-08-14 64 static __always_inline bool test_preempt_need_resched(void)
c2daa3be Peter Zijlstra 2013-08-14 65 {
b3ca1c10 Christoph Lameter 2014-04-07 66 return !(raw_cpu_read_4(__preempt_count) & PREEMPT_NEED_RESCHED);
c2daa3be Peter Zijlstra 2013-08-14 67 }
c2daa3be Peter Zijlstra 2013-08-14 68
c2daa3be Peter Zijlstra 2013-08-14 69 /*
c2daa3be Peter Zijlstra 2013-08-14 70 * The various preempt_count add/sub methods
c2daa3be Peter Zijlstra 2013-08-14 71 */
c2daa3be Peter Zijlstra 2013-08-14 72
c2daa3be Peter Zijlstra 2013-08-14 73 static __always_inline void __preempt_count_add(int val)
c2daa3be Peter Zijlstra 2013-08-14 74 {
b3ca1c10 Christoph Lameter 2014-04-07 @75 raw_cpu_add_4(__preempt_count, val);
c2daa3be Peter Zijlstra 2013-08-14 76 }
c2daa3be Peter Zijlstra 2013-08-14 77
c2daa3be Peter Zijlstra 2013-08-14 78 static __always_inline void __preempt_count_sub(int val)
c2daa3be Peter Zijlstra 2013-08-14 79 {
b3ca1c10 Christoph Lameter 2014-04-07 80 raw_cpu_add_4(__preempt_count, -val);
c2daa3be Peter Zijlstra 2013-08-14 81 }
c2daa3be Peter Zijlstra 2013-08-14 82
ba1f14fb Peter Zijlstra 2013-11-28 83 /*

:::::: The code at line 75 was first introduced by commit
:::::: b3ca1c10d7b32fdfdfaf5484eda486323f52d9be percpu: add raw_cpu_ops

:::::: TO: Christoph Lameter <cl@xxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

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