diff options
| -rw-r--r-- | mm/memory.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index c0869a962ddd..30feedabc932 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4920,6 +4920,15 @@ vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page) pmd_t entry; vm_fault_t ret = VM_FAULT_FALLBACK; + /* + * It is too late to allocate a small folio, we already have a large + * folio in the pagecache: especially s390 KVM cannot tolerate any + * PMD mappings, but PTE-mapped THP are fine. So let's simply refuse any + * PMD mappings if THPs are disabled. + */ + if (thp_disabled_by_hw() || vma_thp_disabled(vma, vma->vm_flags)) + return ret; + if (!thp_vma_suitable_order(vma, haddr, PMD_ORDER)) return ret; |