Re: [kvm:master 1/1] arch/x86/kvm/../../../virt/kvm/kvm_main.c:2062:25: sparse: incorrect type in assignment (different address spaces)

From: Christian Borntraeger
Date: Mon Jan 19 2015 - 14:35:51 EST

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Am 19.01.2015 um 15:33 schrieb kbuild test robot:
> tree: git://git.kernel.org/pub/scm/virt/kvm/kvm.git master
> head: cdef511985374dd042a40bb32c1c346c2662c9dc
> commit: cdef511985374dd042a40bb32c1c346c2662c9dc [1/1] KVM: fix sparse warning in include/trace/events/kvm.h
> reproduce:
> # apt-get install sparse
> git checkout cdef511985374dd042a40bb32c1c346c2662c9dc
> make ARCH=x86_64 allmodconfig
> make C=1 CF=-D__CHECK_ENDIAN__
>
>
> sparse warnings: (new ones prefixed by >>)

FWIW,

looks like my previous fix re-enabled sparse for that code. It bailed out previously due to the
".include/trace/events/kvm.h:163:1: error: directive in argument list
include/trace/events/kvm.h:167:1: error: directive in argument list
include/trace/events/kvm.h:169:1: error: directive in argument list"
errors.

Since that was fixed with commit: cdef511985374dd042a40bb32c1c346c2662c9dc [1/1] KVM: fix sparse warning in include/trace/events/kvm.h, we now we have more sparse errors than before and still its an improvement :-)

Christian

>
>>> arch/x86/kvm/../../../virt/kvm/kvm_main.c:2062:25: sparse: incorrect type in assignment (different address spaces)
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:2062:25: expected struct pid *volatile <noident>
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:2062:25: got struct pid [noderef] <asn:4>*<noident>
>>> arch/x86/kvm/../../../virt/kvm/kvm_main.c:741:9: sparse: incorrect type in assignment (different address spaces)
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:741:9: expected struct kvm_memslots *volatile <noident>
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:741:9: got struct kvm_memslots [noderef] <asn:4>*<noident>
> include/linux/kvm_host.h:482:16: sparse: incompatible types in comparison expression (different address spaces)
> include/linux/kvm_host.h:482:16: sparse: incompatible types in comparison expression (different address spaces)
> include/linux/kvm_host.h:482:16: sparse: incompatible types in comparison expression (different address spaces)
> include/linux/kvm_host.h:482:16: sparse: incompatible types in comparison expression (different address spaces)
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:1790:15: sparse: incompatible types in comparison expression (different address spaces)
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:2957:15: sparse: incompatible types in comparison expression (different address spaces)
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:2974:15: sparse: incompatible types in comparison expression (different address spaces)
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:3024:15: sparse: incompatible types in comparison expression (different address spaces)
> --
>>> arch/x86/kvm/../../../virt/kvm/irqchip.c:125:18: sparse: incorrect type in argument 1 (different address spaces)
> arch/x86/kvm/../../../virt/kvm/irqchip.c:125:18: expected void const *<noident>
> arch/x86/kvm/../../../virt/kvm/irqchip.c:125:18: got struct kvm_irq_routing_table [noderef] <asn:4>*irq_routing
>>> arch/x86/kvm/../../../virt/kvm/irqchip.c:201:13: sparse: incorrect type in assignment (different address spaces)
> arch/x86/kvm/../../../virt/kvm/irqchip.c:201:13: expected struct kvm_irq_routing_table *old
> arch/x86/kvm/../../../virt/kvm/irqchip.c:201:13: got struct kvm_irq_routing_table [noderef] <asn:4>*irq_routing
> --
>>> arch/x86/kvm/x86.c:495:5: sparse: symbol 'kvm_read_nested_guest_page' was not declared. Should it be static?
>>> arch/x86/kvm/x86.c:646:5: sparse: symbol '__kvm_set_xcr' was not declared. Should it be static?
>>> arch/x86/kvm/x86.c:1183:15: sparse: symbol 'max_tsc_khz' was not declared. Should it be static?
>>> arch/x86/kvm/x86.c:1237:6: sparse: symbol 'kvm_track_tsc_matching' was not declared. Should it be static?
>>> arch/x86/kvm/x86.c:1898:38: sparse: incorrect type in argument 1 (different address spaces)
> arch/x86/kvm/x86.c:1898:38: expected void const [noderef] <asn:1>*<noident>
> arch/x86/kvm/x86.c:1898:38: got unsigned char [usertype] *
> include/linux/kvm_host.h:482:16: sparse: incompatible types in comparison expression (different address spaces)
> include/linux/kvm_host.h:482:16: sparse: incompatible types in comparison expression (different address spaces)
> arch/x86/kvm/x86.c:7431:15: sparse: incompatible types in comparison expression (different address spaces)
>
> Please review and possibly fold the followup patch.
>
> vim +2062 arch/x86/kvm/../../../virt/kvm/kvm_main.c
>
> 2122ff5e virt/kvm/kvm_main.c Avi Kivity 2010-05-13 2046 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
> 2122ff5e virt/kvm/kvm_main.c Avi Kivity 2010-05-13 2047 #endif
> 2122ff5e virt/kvm/kvm_main.c Avi Kivity 2010-05-13 2048
> 2122ff5e virt/kvm/kvm_main.c Avi Kivity 2010-05-13 2049
> 9fc77441 virt/kvm/kvm_main.c Michael S. Tsirkin 2012-09-16 2050 r = vcpu_load(vcpu);
> 9fc77441 virt/kvm/kvm_main.c Michael S. Tsirkin 2012-09-16 2051 if (r)
> 9fc77441 virt/kvm/kvm_main.c Michael S. Tsirkin 2012-09-16 2052 return r;
> 6aa8b732 drivers/kvm/kvm_main.c Avi Kivity 2006-12-10 2053 switch (ioctl) {
> 9a2bb7f4 drivers/kvm/kvm_main.c Avi Kivity 2007-02-22 2054 case KVM_RUN:
> f0fe5108 drivers/kvm/kvm_main.c Avi Kivity 2007-03-07 2055 r = -EINVAL;
> f0fe5108 drivers/kvm/kvm_main.c Avi Kivity 2007-03-07 2056 if (arg)
> f0fe5108 drivers/kvm/kvm_main.c Avi Kivity 2007-03-07 2057 goto out;
> 7a72f7a1 virt/kvm/kvm_main.c Christian Borntraeger 2014-08-05 2058 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
> 7a72f7a1 virt/kvm/kvm_main.c Christian Borntraeger 2014-08-05 2059 /* The thread running this VCPU changed. */
> 7a72f7a1 virt/kvm/kvm_main.c Christian Borntraeger 2014-08-05 2060 struct pid *oldpid = vcpu->pid;
> 7a72f7a1 virt/kvm/kvm_main.c Christian Borntraeger 2014-08-05 2061 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
> 7a72f7a1 virt/kvm/kvm_main.c Christian Borntraeger 2014-08-05 @2062 rcu_assign_pointer(vcpu->pid, newpid);
> 7a72f7a1 virt/kvm/kvm_main.c Christian Borntraeger 2014-08-05 2063 if (oldpid)
> 7a72f7a1 virt/kvm/kvm_main.c Christian Borntraeger 2014-08-05 2064 synchronize_rcu();
> 7a72f7a1 virt/kvm/kvm_main.c Christian Borntraeger 2014-08-05 2065 put_pid(oldpid);
> 7a72f7a1 virt/kvm/kvm_main.c Christian Borntraeger 2014-08-05 2066 }
> b6c7a5dc drivers/kvm/kvm_main.c Hollis Blanchard 2007-11-01 2067 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
> 64be5007 virt/kvm/kvm_main.c Gleb Natapov 2010-10-24 2068 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
> 6aa8b732 drivers/kvm/kvm_main.c Avi Kivity 2006-12-10 2069 break;
> 6aa8b732 drivers/kvm/kvm_main.c Avi Kivity 2006-12-10 2070 case KVM_GET_REGS: {
>
> :::::: The code at line 2062 was first introduced by commit
> :::::: 7a72f7a140bfd3a5dae73088947010bfdbcf6a40 KVM: track pid for VCPU only on KVM_RUN ioctl
>
> :::::: TO: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> :::::: CC: Paolo Bonzini <pbonzini@xxxxxxxxxx>
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> http://lists.01.org/mailman/listinfo/kbuild Intel Corporation
>

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Next message: Wolfram Sang: "Re: [PATCH] i2c: drop ancient protection against sysfs refcounting issues"
Previous message: Robert Jarzmik: "Re: [PATCH v3 1/3] dt-bindings: mfd: add lubbock-io binding"
In reply to: kbuild test robot: "[PATCH kvm] KVM: kvm_read_nested_guest_page() can be static"
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