diff options
| -rw-r--r-- | mm/memory.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/mm/memory.c b/mm/memory.c index 072139579d89..4ad2d293ddc2 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1537,10 +1537,15 @@ static vm_fault_t insert_pfn(struct vm_area_struct *vma, unsigned long addr, * in may not match the PFN we have mapped if the * mapped PFN is a writeable COW page. In the mkwrite * case we are creating a writable PTE for a shared - * mapping and we expect the PFNs to match. + * mapping and we expect the PFNs to match. If they + * don't match, we are likely racing with block + * allocation and mapping invalidation so just skip the + * update. */ - if (WARN_ON_ONCE(pte_pfn(*pte) != pfn_t_to_pfn(pfn))) + if (pte_pfn(*pte) != pfn_t_to_pfn(pfn)) { + WARN_ON_ONCE(!is_zero_pfn(pte_pfn(*pte))); goto out_unlock; + } entry = *pte; goto out_mkwrite; } else |