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authorMichael Ellerman <mpe@ellerman.id.au>2018-12-30 14:05:13 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2018-12-30 14:05:13 +1100
commitf460772291f8171988b2b60141a45706123d0c69 (patch)
tree2f6ec8ee9738ffa2a741b93c02ef759fadd19a26 /arch
parent42aee37298f4b1d91ecb55530a62de249ecf4266 (diff)
downloadlinux-f460772291f8171988b2b60141a45706123d0c69.tar.gz
KVM: PPC: Book3S HV: radix: Fix uninitialized var build error
Old GCCs (4.6.3 at least), aren't able to follow the logic in __kvmhv_copy_tofrom_guest_radix() and warn that old_pid is used uninitialized: arch/powerpc/kvm/book3s_64_mmu_radix.c:75:3: error: 'old_pid' may be used uninitialized in this function The logic is OK, we only use old_pid if quadrant == 1, and in that case it has definitely be initialised, eg: if (quadrant == 1) { old_pid = mfspr(SPRN_PID); ... if (quadrant == 1 && pid != old_pid) mtspr(SPRN_PID, old_pid); Annotate it to fix the error. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu_radix.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index fb88167a402a..1b821c6efdef 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -33,8 +33,8 @@ unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid, int pid,
gva_t eaddr, void *to, void *from,
unsigned long n)
{
+ int uninitialized_var(old_pid), old_lpid;
unsigned long quadrant, ret = n;
- int old_pid, old_lpid;
bool is_load = !!to;
/* Can't access quadrants 1 or 2 in non-HV mode, call the HV to do it */