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mm: gup: use get_user_pages_unlocked

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This allows those get_user_pages calls to pass FAULT_FLAG_ALLOW_RETRY to
the page fault in order to release the mmap_sem during the I/O.

Signed-off-by: Andrea Arcangeli <[email protected]>
Reviewed-by: Kirill A. Shutemov <[email protected]>
Cc: Andres Lagar-Cavilla <[email protected]>
Cc: Peter Feiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrea Arcangeli 2015-02-11 15:27:26 -08:00 • committed by Linus Torvalds
commit 7e33912849
5 changed files with 10 additions and 22 deletions
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7
drivers/scsi/st.c
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@ -4551,18 +4551,15 @@ static int sgl_map_user_pages(struct st_buffer *STbp,
return -ENOMEM;
/* Try to fault in all of the necessary pages */
down_read(&current->mm->mmap_sem);
/* rw==READ means read from drive, write into memory area */
res = get_user_pages(
res = get_user_pages_unlocked(
current,
current->mm,
uaddr,
nr_pages,
rw == READ,
0, /* don't force */
pages,
NULL);
up_read(&current->mm->mmap_sem);
pages);
/* Errors and no page mapped should return here */
if (res < nr_pages)