Drop the unnecessary initialization of the local 'pfn' variable in
hva_to_pfn(). First and foremost, '0' is not an invalid pfn, it's a
perfectly valid pfn on most architectures. I.e. if hva_to_pfn() were to
return an "uninitializd" pfn, it would actually be interpeted as a legal
pfn by most callers.
Second, hva_to_pfn() can't return an uninitialized pfn as hva_to_pfn()
explicitly sets pfn to an error value (or returns an error value directly)
if a helper returns failure, and all helpers set the pfn on success.
The zeroing of 'pfn' was introduced by commit
2fc843117d64 ("KVM:
reorganize hva_to_pfn"), probably to avoid "uninitialized variable"
warnings on statements that return pfn. However, no compiler seems
to produce them, making the initialization unnecessary.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <
20220429010416.
2788472-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
bool write_fault, bool *writable)
{
struct vm_area_struct *vma;
- kvm_pfn_t pfn = 0;
+ kvm_pfn_t pfn;
int npages, r;
/* we can do it either atomically or asynchronously, not both */