diff options
| author | David Hildenbrand <david@redhat.com> | 2023-12-20 23:44:27 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-12-29 20:58:47 +0100 |
| commit | 44887f39945519fa8405133b1acd098fda9c9746 (patch) | |
| tree | f753041d11b1e3de1d51f853c680b1c43da78cf6 /mm/rmap.c | |
| parent | mm/rmap: introduce and use hugetlb_remove_rmap() (diff) | |
| download | linux-44887f39945519fa8405133b1acd098fda9c9746.tar.xz linux-44887f39945519fa8405133b1acd098fda9c9746.zip | |
mm/rmap: introduce and use hugetlb_add_file_rmap()
hugetlb rmap handling differs quite a lot from "ordinary" rmap code. For
example, hugetlb currently only supports entire mappings, and treats any
mapping as mapped using a single "logical PTE". Let's move it out of the
way so we can overhaul our "ordinary" rmap. implementation/interface.
Right now we're using page_dup_file_rmap() in some cases where "ordinary"
rmap code would have used page_add_file_rmap(). So let's introduce and
use hugetlb_add_file_rmap() instead. We won't be adding a
"hugetlb_dup_file_rmap()" functon for the fork() case, as it would be
doing the same: "dup" is just an optimization for "add".
What remains is a single page_dup_file_rmap() call in fork() code.
Add sanity checks that we end up with the right folios in the right
functions.
Link: https://lkml.kernel.org/r/20231220224504.646757-4-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index 261e1af0d254..a57ec926daf0 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1395,6 +1395,7 @@ void folio_add_file_rmap_range(struct folio *folio, struct page *page, unsigned int nr_pmdmapped = 0, first; int nr = 0; + VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio); VM_WARN_ON_FOLIO(compound && !folio_test_pmd_mappable(folio), folio); /* Is page being mapped by PTE? Is this its first map to be added? */ |