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authorJeremy Fitzhardinge <jeremy@goop.org>2013-08-09 19:51:59 +0530
committerH. Peter Anvin <hpa@linux.intel.com>2013-08-09 07:54:03 -0700
commit1ed7bf5f5227169b661c619636f754b98001ec30 (patch)
tree401ebe5d78455719bb3cf65faaa6d2ad1ec38fad /include/uapi/linux/kvm_para.h
parent96f853eaa889c7a22718d275b0df7bebdbd6780e (diff)
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xen, pvticketlock: Allow interrupts to be enabled while blocking
If interrupts were enabled when taking the spinlock, we can leave them enabled while blocking to get the lock. If we can enable interrupts while waiting for the lock to become available, and we take an interrupt before entering the poll, and the handler takes a spinlock which ends up going into the slow state (invalidating the per-cpu "lock" and "want" values), then when the interrupt handler returns the event channel will remain pending so the poll will return immediately, causing it to return out to the main spinlock loop. Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org> Link: http://lkml.kernel.org/r/1376058122-8248-12-git-send-email-raghavendra.kt@linux.vnet.ibm.com Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'include/uapi/linux/kvm_para.h')
0 files changed, 0 insertions, 0 deletions
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