FAILED: patch "[PATCH] KVM: arm/arm64: vgic-its: Preserve the revious read from the" failed to apply to 4.9-stable tree

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From: Marc Zyngier <[email protected]>
Date: Thu, 16 Nov 2017 17:58:17 +0000
Subject: [PATCH] KVM: arm/arm64: vgic-its: Preserve the revious read from the
pending table

The current pending table parsing code assumes that we keep the previous read of the pending bits, but keep that variable in the current block, making sure it is discarded on each loop.

We end-up using whatever is on the stack. Who knows, it might just be the right thing...

index 1f761a9991e7..cb2d0a2dbe5a 100644
@@ -421,6 +421,7 @@ static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu)
 	u32 *intids;
 	int nr_irqs, i;
 	unsigned long flags;
+	u8 pendmask;
 
 	nr_irqs = vgic_copy_lpi_list(vcpu, &intids);
 	if (nr_irqs < 0)

@@ -428,7 +429,6 @@ static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu)
 
 	for (i = 0; i < nr_irqs; i++) {
 		int byte_offset, bit_nr;
-		u8 pendmask;
 
 		byte_offset = intids[i] / BITS_PER_BYTE;
 		bit_nr = intids[i] % BITS_PER_BYTE;