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mm/migrate.c: also overwrite error when it is bigger than zero 

If we get here after successfully adding page to list, err would be 1 to
indicate the page is queued in the list.

Current code has two problems:

  * on success, 0 is not returned
  * on error, if add_page_for_migratioin() return 1, and the following err1
    from do_move_pages_to_node() is set, the err1 is not returned since err
    is 1

And these behaviors break the user interface.

Link: http://lkml.kernel.org/r/20200119065753.21694-1-richardw.yang@linux.intel.com
Fixes: e0153fc2c7 ("mm: move_pages: return valid node id in status if the page is already on the target node").
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Acked-by: Yang Shi <yang.shi@linux.alibaba.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2020-01-30 22:11:14 -08:00 committed by Linus Torvalds
parent 1f503443e7
commit dfe9aa23ca
1 changed files with 1 additions and 1 deletions
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2
mm/migrate.c
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@ -1676,7 +1676,7 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
err1 = do_move_pages_to_node(mm, &pagelist, current_node); err1 = do_move_pages_to_node(mm, &pagelist, current_node);
if (!err1) if (!err1)
err1 = store_status(status, start, current_node, i - start); err1 = store_status(status, start, current_node, i - start);
if (!err) if (err >= 0)
err = err1; err = err1;
out: out:
return err; return err;