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Revert "mm/shmem: fix shmem_swapin() race with swapoff"

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This reverts commit a533a21b692fc15a6aadfa827b29c7d9989109ca which is
commit 2efa33fc7f6ec94a3a538c1a264273c889be2b36 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>
This commit is contained in:
Greg Kroah-Hartman 2021-07-22 15:46:08 +02:00
parent 2179d96ec7
commit 7d7d0e84ac
1 changed files with 1 additions and 13 deletions
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14
mm/shmem.c
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@ -1698,8 +1698,7 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index,
struct address_space *mapping = inode->i_mapping;
struct shmem_inode_info *info = SHMEM_I(inode);
struct mm_struct *charge_mm = vma ? vma->vm_mm : current->mm;
struct swap_info_struct *si;
struct page *page = NULL;
struct page *page;
swp_entry_t swap;
int error;
@ -1707,12 +1706,6 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index,
swap = radix_to_swp_entry(*pagep);
*pagep = NULL;
/* Prevent swapoff from happening to us. */
si = get_swap_device(swap);
if (!si) {
error = EINVAL;
goto failed;
}
/* Look it up and read it in.. */
page = lookup_swap_cache(swap, NULL, 0);
if (!page) {
@ -1774,8 +1767,6 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index,
swap_free(swap);
*pagep = page;
if (si)
put_swap_device(si);
return 0;
failed:
if (!shmem_confirm_swap(mapping, index, swap))
@ -1786,9 +1777,6 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index,
put_page(page);
}
if (si)
put_swap_device(si);
return error;
}