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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-05 11:39:56 +0900 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-05 11:39:56 +0900 |
| commit | a5fff14a0c7989fbc8316a43f52aed1804f02ddd (patch) | |
| tree | d8d4ef6c808868f7d42b6b44cc27b871a22d460a /mm/page_io.c | |
| parent | ecbe5086adc2876b22c898987d8a20f932de87a9 (diff) | |
| parent | 8751853091998cd31e9e5f1e8206280155af8921 (diff) | |
Merge branch 'akpm' (patches from Andrew)
Merge more fixes from Andrew Morton:
"5 fixes"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
swap_readpage(): avoid blk_wake_io_task() if !synchronous
devres: allow const resource arguments
mm/vmscan.c: prevent useless kswapd loops
fs/userfaultfd.c: disable irqs for fault_pending and event locks
mm/page_alloc.c: fix regression with deferred struct page init
Diffstat (limited to 'mm/page_io.c')
| -rw-r--r-- | mm/page_io.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/mm/page_io.c b/mm/page_io.c index 189415852077..a39aac2f8c8d 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -137,8 +137,10 @@ out: unlock_page(page); WRITE_ONCE(bio->bi_private, NULL); bio_put(bio); - blk_wake_io_task(waiter); - put_task_struct(waiter); + if (waiter) { + blk_wake_io_task(waiter); + put_task_struct(waiter); + } } int generic_swapfile_activate(struct swap_info_struct *sis, @@ -395,11 +397,12 @@ int swap_readpage(struct page *page, bool synchronous) * Keep this task valid during swap readpage because the oom killer may * attempt to access it in the page fault retry time check. */ - get_task_struct(current); - bio->bi_private = current; bio_set_op_attrs(bio, REQ_OP_READ, 0); - if (synchronous) + if (synchronous) { bio->bi_opf |= REQ_HIPRI; + get_task_struct(current); + bio->bi_private = current; + } count_vm_event(PSWPIN); bio_get(bio); qc = submit_bio(bio); |