lib/stackdepot.c: use __GFP_NOWARN for stack allocations

This (large, atomic) allocation attempt can fail.  We expect and handle
that, so avoid the scary warning.

Link: http://lkml.kernel.org/r/20160720151905.GB19146@node.shutemov.name
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Rik van Riel <riel@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 53ad6c0831aebe6d3c9ec7cfc1387fa34ca7ea72..60f77f1d470a0589ccdeacbb52a9eb45a8a1cec1 100644 (file)
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -242,6 +242,7 @@ depot_stack_handle_t depot_save_stack(struct stack_trace *trace,
                 */
                alloc_flags &= ~GFP_ZONEMASK;
                alloc_flags &= (GFP_ATOMIC | GFP_KERNEL);
+               alloc_flags |= __GFP_NOWARN;
                page = alloc_pages(alloc_flags, STACK_ALLOC_ORDER);
                if (page)
                        prealloc = page_address(page);