Qi Zheng 51a83f65e5 mm: fix unexpected changes to {failslab|fail_page_alloc}.attr
commit ea4452de2ae987342fadbdd2c044034e6480daad upstream.

When we specify __GFP_NOWARN, we only expect that no warnings will be
issued for current caller.  But in the __should_failslab() and
__should_fail_alloc_page(), the local GFP flags alter the global
{failslab|fail_page_alloc}.attr, which is persistent and shared by all
tasks.  This is not what we expected, let's fix it.

[akpm@linux-foundation.org: unexport should_fail_ex()]
Link: https://lkml.kernel.org/r/20221118100011.2634-1-zhengqi.arch@bytedance.com
Fixes: 3f913fc5f974 ("mm: fix missing handler for __GFP_NOWARN")
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-12-02 17:43:13 +01:00
..
2022-05-09 17:20:37 -07:00
2021-07-08 11:48:20 -07:00
2021-09-08 11:50:26 -07:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-11-18 13:16:22 -08:00
2021-05-06 19:24:12 -07:00
2022-08-07 17:52:35 -07:00
2018-08-16 12:14:42 -07:00
2021-01-21 14:06:00 -07:00
2022-03-07 12:48:35 -07:00
2021-08-19 09:02:55 +09:00
2022-04-22 21:30:57 +02:00
2021-01-03 20:05:18 -05:00
2022-01-15 08:47:31 -08:00
2022-03-07 12:48:35 -07:00
2022-04-29 14:38:01 -07:00
2022-07-10 13:55:49 -07:00
2021-08-19 09:02:55 +09:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2018-10-16 13:45:44 +02:00
2022-06-12 14:51:51 +08:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-09-17 13:52:17 +01:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2022-06-03 10:34:34 -07:00
2022-04-29 14:38:01 -07:00
2021-06-18 11:43:09 +02:00
2021-07-08 11:48:20 -07:00
2022-01-20 08:52:54 +02:00
2018-10-15 16:31:29 -04:00