| Message ID | 20200910144833.742260-10-hch@lst.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [01/12] fs: remove the unused SB_I_MULTIROOT flag | expand |
On Thu 10-09-20 16:48:29, Christoph Hellwig wrote: > There is no point in trying to call bdev_read_page if SWP_SYNCHRONOUS_IO > is not set, as the device won't support it. > > Signed-off-by: Christoph Hellwig <hch@lst.de> Looks good to me. You can add: Reviewed-by: Jan Kara <jack@suse.cz> Honza > --- > mm/page_io.c | 18 ++++++++++-------- > 1 file changed, 10 insertions(+), 8 deletions(-) > > diff --git a/mm/page_io.c b/mm/page_io.c > index e485a6e8a6cddb..b199b87e0aa92b 100644 > --- a/mm/page_io.c > +++ b/mm/page_io.c > @@ -403,15 +403,17 @@ int swap_readpage(struct page *page, bool synchronous) > goto out; > } > > - ret = bdev_read_page(sis->bdev, swap_page_sector(page), page); > - if (!ret) { > - if (trylock_page(page)) { > - swap_slot_free_notify(page); > - unlock_page(page); > - } > + if (sis->flags & SWP_SYNCHRONOUS_IO) { > + ret = bdev_read_page(sis->bdev, swap_page_sector(page), page); > + if (!ret) { > + if (trylock_page(page)) { > + swap_slot_free_notify(page); > + unlock_page(page); > + } > > - count_vm_event(PSWPIN); > - goto out; > + count_vm_event(PSWPIN); > + goto out; > + } > } > > ret = 0; > -- > 2.28.0 >
diff --git a/mm/page_io.c b/mm/page_io.c index e485a6e8a6cddb..b199b87e0aa92b 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -403,15 +403,17 @@ int swap_readpage(struct page *page, bool synchronous) goto out; } - ret = bdev_read_page(sis->bdev, swap_page_sector(page), page); - if (!ret) { - if (trylock_page(page)) { - swap_slot_free_notify(page); - unlock_page(page); - } + if (sis->flags & SWP_SYNCHRONOUS_IO) { + ret = bdev_read_page(sis->bdev, swap_page_sector(page), page); + if (!ret) { + if (trylock_page(page)) { + swap_slot_free_notify(page); + unlock_page(page); + } - count_vm_event(PSWPIN); - goto out; + count_vm_event(PSWPIN); + goto out; + } } ret = 0;
There is no point in trying to call bdev_read_page if SWP_SYNCHRONOUS_IO is not set, as the device won't support it. Signed-off-by: Christoph Hellwig <hch@lst.de> --- mm/page_io.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-)