diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-22 15:43:47 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-25 14:36:17 +0200 |
| commit | 277b311ae170b90fcc30551d1a30d17fceb113a4 (patch) | |
| tree | 9ce2400d1599ab1673c873bce675baf6f8277699 /mm/memory.c | |
| parent | d92aa22f24199e55a3d5a1854498a756c6f60449 (diff) | |
Revert "swap: fix do_swap_page() race with swapoff"
This reverts commit 8e4af3917bfc5e82f8010417c12b755ef256fa5e which is
commit 2799e77529c2a25492a4395db93996e3dacd762d upstream.
It should not have been added to the stable trees, sorry about that.
Link: https://lore.kernel.org/r/YPVgaY6uw59Fqg5x@casper.infradead.org
Reported-by: From: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Ying Huang <ying.huang@intel.com>
Cc: Alex Shi <alexs@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 11 |
1 files changed, 2 insertions, 9 deletions
diff --git a/mm/memory.c b/mm/memory.c index 0a905e0a7e67..eb31b3e4ef93 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3302,7 +3302,6 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; struct page *page = NULL, *swapcache; - struct swap_info_struct *si = NULL; swp_entry_t entry; pte_t pte; int locked; @@ -3330,16 +3329,14 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) goto out; } - /* Prevent swapoff from happening to us. */ - si = get_swap_device(entry); - if (unlikely(!si)) - goto out; delayacct_set_flag(DELAYACCT_PF_SWAPIN); page = lookup_swap_cache(entry, vma, vmf->address); swapcache = page; if (!page) { + struct swap_info_struct *si = swp_swap_info(entry); + if (data_race(si->flags & SWP_SYNCHRONOUS_IO) && __swap_count(entry) == 1) { /* skip swapcache */ @@ -3510,8 +3507,6 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) unlock: pte_unmap_unlock(vmf->pte, vmf->ptl); out: - if (si) - put_swap_device(si); return ret; out_nomap: pte_unmap_unlock(vmf->pte, vmf->ptl); @@ -3523,8 +3518,6 @@ out_release: unlock_page(swapcache); put_page(swapcache); } - if (si) - put_swap_device(si); return ret; } |