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authorDavid Hildenbrand <david@redhat.com>2022-08-25 18:46:57 +0200
committerAndrew Morton <akpm@linux-foundation.org>2022-09-26 19:46:28 -0700
commit474098edac262ae26bfab1c48445877075a31cbd (patch)
tree4a3e87b877db5029d08b97e814d275d49d38f561 /mm/huge_memory.c
parentf7091ed64ec8311b0c35865875f8c3e04e5ea532 (diff)
mm/gup: replace FOLL_NUMA by gup_can_follow_protnone()
Patch series "mm: minor cleanups around NUMA hinting". Working on some GUP cleanups (e.g., getting rid of some FOLL_ flags) and preparing for other GUP changes (getting rid of FOLL_FORCE|FOLL_WRITE for for taking a R/O longterm pin), this is something I can easily send out independently. Get rid of FOLL_NUMA, allow FOLL_FORCE access to PROT_NONE mapped pages in GUP-fast, and fixup some documentation around NUMA hinting. This patch (of 3): No need for a special flag that is not even properly documented to be internal-only. Let's just factor this check out and get rid of this flag. The separate function has the nice benefit that we can centralize comments. Link: https://lkml.kernel.org/r/20220825164659.89824-2-david@redhat.com Link: https://lkml.kernel.org/r/20220825164659.89824-1-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Peter Xu <peterx@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 135acf87d24d..84bf1d5f6b7e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1447,7 +1447,7 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
return ERR_PTR(-EFAULT);
/* Full NUMA hinting faults to serialise migration in fault paths */
- if ((flags & FOLL_NUMA) && pmd_protnone(*pmd))
+ if (pmd_protnone(*pmd) && !gup_can_follow_protnone(flags))
return NULL;
if (!pmd_write(*pmd) && gup_must_unshare(flags, page))