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80bd58fef4
Replace the old Xen implementation of PV spinlocks with and implementation of xen_lock_spinning and xen_unlock_kick. xen_lock_spinning simply registers the cpu in its entry in lock_waiting, adds itself to the waiting_cpus set, and blocks on an event channel until the channel becomes pending. xen_unlock_kick searches the cpus in waiting_cpus looking for the one which next wants this lock with the next ticket, if any. If found, it kicks it by making its event channel pending, which wakes it up. We need to make sure interrupts are disabled while we're relying on the contents of the per-cpu lock_waiting values, otherwise an interrupt handler could come in, try to take some other lock, block, and overwrite our values. Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org> Link: http://lkml.kernel.org/r/1376058122-8248-6-git-send-email-raghavendra.kt@linux.vnet.ibm.com Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [ Raghavendra: use function + enum instead of macro, cmpxchg for zero status reset Reintroduce break since we know the exact vCPU to send IPI as suggested by Konrad.] 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> |
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| .. | ||
| apic.c | ||
| debugfs.c | ||
| debugfs.h | ||
| enlighten.c | ||
| grant-table.c | ||
| irq.c | ||
| Kconfig | ||
| Makefile | ||
| mmu.c | ||
| mmu.h | ||
| multicalls.c | ||
| multicalls.h | ||
| p2m.c | ||
| pci-swiotlb-xen.c | ||
| platform-pci-unplug.c | ||
| setup.c | ||
| smp.c | ||
| smp.h | ||
| spinlock.c | ||
| suspend.c | ||
| time.c | ||
| trace.c | ||
| vdso.h | ||
| vga.c | ||
| xen-asm_32.S | ||
| xen-asm_64.S | ||
| xen-asm.h | ||
| xen-asm.S | ||
| xen-head.S | ||
| xen-ops.h | ||