diff options
| author | Oliver Upton <oliver.upton@linux.dev> | 2024-02-21 06:42:49 +0100 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2024-02-23 22:46:02 +0100 |
| commit | 05f4d4f5d462618150a199bf26fd442b54b5d41a (patch) | |
| tree | dbe257e3dd1c896eed33649aea1101b46cf42abf /arch/arm64/kvm/vgic/vgic-its.c | |
| parent | KVM: arm64: vgic: Get rid of the LPI linked-list (diff) | |
| download | linux-05f4d4f5d462618150a199bf26fd442b54b5d41a.tar.xz linux-05f4d4f5d462618150a199bf26fd442b54b5d41a.zip | |
KVM: arm64: vgic: Use atomics to count LPIs
Switch to using atomics for LPI accounting, allowing vgic_irq references
to be dropped in parallel.
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240221054253.3848076-7-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64/kvm/vgic/vgic-its.c')
| -rw-r--r-- | arch/arm64/kvm/vgic/vgic-its.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c index 3d0208162bcd..0be3c33676c3 100644 --- a/arch/arm64/kvm/vgic/vgic-its.c +++ b/arch/arm64/kvm/vgic/vgic-its.c @@ -96,7 +96,7 @@ static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid, goto out_unlock; } - dist->lpi_list_count++; + atomic_inc(&dist->lpi_count); out_unlock: raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); @@ -346,7 +346,7 @@ int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr) * command). If coming from another path (such as enabling LPIs), * we must be careful not to overrun the array. */ - irq_count = READ_ONCE(dist->lpi_list_count); + irq_count = atomic_read(&dist->lpi_count); intids = kmalloc_array(irq_count, sizeof(intids[0]), GFP_KERNEL_ACCOUNT); if (!intids) return -ENOMEM; |