tree 413557a35e5f60b5951c3b261cd8604383bd1089
parent 0b09b6e51931ef5b4e0d7adee0a666c7f4b1867b
author Christoffer Dall <cdall@linaro.org> 1489841322 +0100
committer Christoffer Dall <cdall@linaro.org> 1491749352 -0700

KVM: arm/arm64: vgic: Improve sync_hwstate performance

There is no need to call any functions to fold LRs when we don't use any
LRs and we don't need to mess with overflow flags, take spinlocks, or
prune the AP list if the AP list is empty.

Note: list_empty is a single atomic read (uses READ_ONCE) and can
therefore check if a list is empty or not without the need to take the
spinlock protecting the list.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>