mm: fix unexpected changes to {failslab|fail_page_alloc}.attr

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.

[[email protected]: unexport should_fail_ex()]
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 3f913fc5f974 ("mm: fix missing handler for __GFP_NOWARN")
Signed-off-by: Qi Zheng <[email protected]>
Reported-by: Dmitry Vyukov <[email protected]>
Reviewed-by: Akinobu Mita <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Cc: Akinobu Mita <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions