Re: [PATCH v3 12/14] KVM: Add barriers to allow mmu_notifier_retry to be used locklessly

On 12/19/2011 07:18 PM, Alexander Graf wrote:

On 12.12.2011, at 23:37, Paul Mackerras wrote:

quoted

This adds an smp_wmb in kvm_mmu_notifier_invalidate_range_end() and an
smp_rmb in mmu_notifier_retry() so that mmu_notifier_retry() will give
the correct answer when called without kvm->mmu_lock being held.
PowerPC Book3S HV KVM wants to use a bitlock per guest page rather than
a single global spinlock in order to improve the scalability of updates
to the guest MMU hashed page table, and so needs this.

Signed-off-by: Paul Mackerras <redacted>

Avi, mind to ack?

Acked-by: Avi Kivity <redacted>

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error compiling committee.c: too many arguments to function