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authorPeter Xu <peterx@redhat.com>2022-10-31 00:41:51 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-12-01 02:58:46 +0300
commit15520a3f046998e3f57e695743e99b0875e2dae7 (patch)
tree831e756367bc6484cba5fcafc6d782b153e1b4b3 /mm/swapfile.c
parentca92ea3dc5a2b01f98e9f02b7a6bc03be06fe124 (diff)
downloadlinux-15520a3f046998e3f57e695743e99b0875e2dae7.tar.xz
mm: use pte markers for swap errors
PTE markers are ideal mechanism for things like SWP_SWAPIN_ERROR. Using a whole swap entry type for this purpose can be an overkill, especially if we already have PTE markers. Define a new bit for swapin error and replace it with pte markers. Then we can safely drop SWP_SWAPIN_ERROR and give one device slot back to swap. We used to have SWP_SWAPIN_ERROR taking the page pfn as part of the swap entry, but it's never used. Neither do I see how it can be useful because normally the swapin failure should not be caused by a bad page but bad swap device. Drop it alongside. Link: https://lkml.kernel.org/r/20221030214151.402274-3-peterx@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: Huang Ying <ying.huang@intel.com> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Naoya Horiguchi <naoya.horiguchi@nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/swapfile.c')
-rw-r--r--mm/swapfile.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 72e481aacd5d..03fe0949f6b2 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1781,7 +1781,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
pte_t pteval;
dec_mm_counter(vma->vm_mm, MM_SWAPENTS);
- pteval = swp_entry_to_pte(make_swapin_error_entry(page));
+ pteval = swp_entry_to_pte(make_swapin_error_entry());
set_pte_at(vma->vm_mm, addr, pte, pteval);
swap_free(entry);
ret = 0;