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    SubjectRe: [PATCH] kvm: use the correct RCU API
    On 04/21/2010 12:55 AM, Paul E. McKenney wrote:
    > On Mon, Apr 19, 2010 at 05:41:23PM +0800, Lai Jiangshan wrote:
    >
    >> The RCU/SRCU API have already changed for proving RCU usage.
    >>
    >> I got the following dmesg when PROVE_RCU=y because we used incorrect API.
    >> This patch coverts rcu_deference() to srcu_dereference() or family API.
    >>
    >> ===================================================
    >> [ INFO: suspicious rcu_dereference_check() usage. ]
    >> ---------------------------------------------------
    >> arch/x86/kvm/mmu.c:3020 invoked rcu_dereference_check() without protection!
    >>
    >> other info that might help us debug this:
    >>
    >>
    >> rcu_scheduler_active = 1, debug_locks = 0
    >> 2 locks held by qemu-system-x86/8550:
    >> #0: (&kvm->slots_lock){+.+.+.}, at: [<ffffffffa011a6ac>] kvm_set_memory_region+0x29/0x50 [kvm]
    >> #1: (&(&kvm->mmu_lock)->rlock){+.+...}, at: [<ffffffffa012262d>] kvm_arch_commit_memory_region+0xa6/0xe2 [kvm]
    >>
    >> stack backtrace:
    >> Pid: 8550, comm: qemu-system-x86 Not tainted 2.6.34-rc4-tip-01028-g939eab1 #27
    >> Call Trace:
    >> [<ffffffff8106c59e>] lockdep_rcu_dereference+0xaa/0xb3
    >> [<ffffffffa012f6c1>] kvm_mmu_calculate_mmu_pages+0x44/0x7d [kvm]
    >> [<ffffffffa012263e>] kvm_arch_commit_memory_region+0xb7/0xe2 [kvm]
    >> [<ffffffffa011a5d7>] __kvm_set_memory_region+0x636/0x6e2 [kvm]
    >> [<ffffffffa011a6ba>] kvm_set_memory_region+0x37/0x50 [kvm]
    >> [<ffffffffa015e956>] vmx_set_tss_addr+0x46/0x5a [kvm_intel]
    >> [<ffffffffa0126592>] kvm_arch_vm_ioctl+0x17a/0xcf8 [kvm]
    >> [<ffffffff810a8692>] ? unlock_page+0x27/0x2c
    >> [<ffffffff810bf879>] ? __do_fault+0x3a9/0x3e1
    >> [<ffffffffa011b12f>] kvm_vm_ioctl+0x364/0x38d [kvm]
    >> [<ffffffff81060cfa>] ? up_read+0x23/0x3d
    >> [<ffffffff810f3587>] vfs_ioctl+0x32/0xa6
    >> [<ffffffff810f3b19>] do_vfs_ioctl+0x495/0x4db
    >> [<ffffffff810e6b2f>] ? fget_light+0xc2/0x241
    >> [<ffffffff810e416c>] ? do_sys_open+0x104/0x116
    >> [<ffffffff81382d6d>] ? retint_swapgs+0xe/0x13
    >> [<ffffffff810f3ba6>] sys_ioctl+0x47/0x6a
    >> [<ffffffff810021db>] system_call_fastpath+0x16/0x1b
    >>
    > I have queued this one up, thank you, Lai!
    >
    >

    I'd like this to go through kvm.git as well.

    --
    error compiling committee.c: too many arguments to function



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