[PATCH v2 4/5] ARM: KVM: get rid of S2_PGD_SIZE

[Marc Zyngier]

S2_PGD_SIZE defines the number of pages used by a stage-2 PGD
and is unused, except for a VM_BUG_ON check that missuses the
define.

As the check is very unlikely to ever triggered except in
circumstances where KVM is the least of our worries, just kill
both the define and the VM_BUG_ON check.

Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
---
 arch/arm/include/asm/kvm_arm.h | 1 -
 arch/arm/kvm/mmu.c             | 3 ---
 2 files changed, 4 deletions(-)

diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
index 124623e..64e9696 100644
--- a/arch/arm/include/asm/kvm_arm.h
+++ b/arch/arm/include/asm/kvm_arm.h
@@ -135,7 +135,6 @@
 #define KVM_PHYS_MASK	(KVM_PHYS_SIZE - 1ULL)
 #define PTRS_PER_S2_PGD	(1ULL << (KVM_PHYS_SHIFT - 30))
 #define S2_PGD_ORDER	get_order(PTRS_PER_S2_PGD * sizeof(pgd_t))
-#define S2_PGD_SIZE	(1 << S2_PGD_ORDER)
 
 /* Virtualization Translation Control Register (VTCR) bits */
 #define VTCR_SH0	(3 << 12)
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index d79b594..3c506c7 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -379,9 +379,6 @@ int kvm_alloc_stage2_pgd(struct kvm *kvm)
 	if (!pgd)
 		return -ENOMEM;
 
-	/* stage-2 pgd must be aligned to its size */
-	VM_BUG_ON((unsigned long)pgd & (S2_PGD_SIZE - 1));
-
 	memset(pgd, 0, PTRS_PER_S2_PGD * sizeof(pgd_t));
 	kvm_clean_pgd(pgd);
 	kvm->arch.pgd = pgd;
-- 
1.8.2.1