From: Wei Yang <richardw.yang@linux.intel.com>
To: Wei Yang <richardw.yang@linux.intel.com>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/migrate.c: also overwrite error when it is bigger than zero
Date: Sat, 18 Jan 2020 06:27:40 +0800 [thread overview]
Message-ID: <20200117222740.GB29229@richard> (raw)
In-Reply-To: <20200117074534.25324-1-richardw.yang@linux.intel.com>
On Fri, Jan 17, 2020 at 03:45:34PM +0800, Wei Yang wrote:
>If we get here after successfully adding page to list, err would be
>the number of pages in the list.
>
>Current code has two problems:
>
> * on success, 0 is not returned
> * on error, the real error code is not returned
>
Well, this breaks the user interface. User would receive 1 even the migration
succeed.
The change is introduced by e0153fc2c760 ("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>
>---
> mm/migrate.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/mm/migrate.c b/mm/migrate.c
>index 557da996b936..c3ef70de5876 100644
>--- a/mm/migrate.c
>+++ b/mm/migrate.c
>@@ -1677,7 +1677,7 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
> err1 = do_move_pages_to_node(mm, &pagelist, current_node);
> if (!err1)
> err1 = store_status(status, start, current_node, i - start);
>- if (!err)
>+ if (err >= 0)
> err = err1;
> out:
> return err;
>--
>2.17.1
--
Wei Yang
Help you, Help me
next prev parent reply other threads:[~2020-01-17 22:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 7:45 Wei Yang
2020-01-17 22:27 ` Wei Yang [this message]
2020-01-17 23:30 ` Yang Shi
2020-01-17 23:48 ` Wei Yang
2020-01-18 1:38 ` Mike Kravetz
2020-01-19 2:17 ` Wei Yang
2020-01-18 4:56 ` Yang Shi
2020-01-19 2:41 ` Wei Yang
2020-01-19 5:54 ` Yang Shi
2020-01-18 5:32 ` Yang Shi
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