Commit 56041bf9 authored Jan 30, 2014 by Marc Zyngier

ARM: KVM: fix warning in mmu.c



Compiling with THP enabled leads to the following warning:

arch/arm/kvm/mmu.c: In function ‘unmap_range’:
arch/arm/kvm/mmu.c:177:39: warning: ‘pte’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   if (kvm_pmd_huge(*pmd) || page_empty(pte)) {
                                        ^
Code inspection reveals that these two cases are mutually exclusive,
so GCC is a bit overzealous here. Silence it anyway by initializing
pte to NULL and testing it later on.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>

parent 8034699a

arch/arm/kvm/mmu.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -144,6 +144,7 @@ static void unmap_range(struct kvm kvm, pgd_t pgdp,
		while (addr < end) {
		pgd = pgdp + pgd_index(addr);
		pud = pud_offset(pgd, addr);
		pte = NULL;
		if (pud_none(*pud)) {
		addr = kvm_pud_addr_end(addr, end);
		continue;
		@@ -174,7 +175,7 @@ static void unmap_range(struct kvm kvm, pgd_t pgdp,
		/*
		* If the pmd entry is to be cleared, walk back up the ladder
		*/
		if (kvm_pmd_huge(*pmd) \|\| page_empty(pte)) {
		if (kvm_pmd_huge(*pmd) \|\| (pte && page_empty(pte))) {
		clear_pmd_entry(kvm, pmd, addr);
		next = kvm_pmd_addr_end(addr, end);
		if (page_empty(pmd) && !page_empty(pud)) {