Re: [PATCH v2 2/3] mm: Allow architectures to request 'old' entries when prefaulting
From: Kirill A. Shutemov <hidden>
Date: 2021-01-11 14:26:42
Also in:
linux-arm-kernel, lkml
On Fri, Jan 08, 2021 at 05:15:16PM +0000, Will Deacon wrote:
quoted hunk ↗ jump to hunk
diff --git a/mm/filemap.c b/mm/filemap.c index c1f2dc89b8a7..0fb9d1714797 100644 --- a/mm/filemap.c +++ b/mm/filemap.c@@ -3051,14 +3051,18 @@ vm_fault_t filemap_map_pages(struct vm_fault *vmf, if (!pte_none(*vmf->pte)) goto unlock; + /* We're about to handle the fault */ + if (vmf->address == address) { + vmf->flags &= ~FAULT_FLAG_PREFAULT; + ret = VM_FAULT_NOPAGE; + } else { + vmf->flags |= FAULT_FLAG_PREFAULT; + } +
Do we need to restore the oririnal status of the bit once we are done? -- Kirill A. Shutemov