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ARM: KVM: fix warning in mmu.c

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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>
This commit is contained in:
Marc Zyngier 2014-01-30 17:38:33 +00:00
parent 8034699a42
commit 56041bf920
1 changed files with 2 additions and 1 deletions
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3
arch/arm/kvm/mmu.c
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@ -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)) {