[PATCH tip/core/rcu 2/6] kvfree_rcu: Use __GFP_NOMEMALLOC for single-argument kvfree_rcu()

[paulmck]

From: "Paul E. McKenney" <paul...@kernel.org>

This commit applies the __GFP_NOMEMALLOC gfp flag to memory allocations
carried out by the single-argument variant of kvfree_rcu(), thus avoiding
this can-sleep code path from dipping into the emergency reserves.

Acked-by: Michal Hocko <mho...@suse.com>
Suggested-by: Michal Hocko <mho...@suse.com>
Signed-off-by: Paul E. McKenney <paul...@kernel.org>
---
 kernel/rcu/tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 1f8c980..08b5044 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3519,7 +3519,7 @@ add_ptr_to_bulk_krc_lock(struct kfree_rcu_cpu **krcp,
                if (!bnode && can_alloc) {
                        krc_this_cpu_unlock(*krcp, *flags);
                        bnode = (struct kvfree_rcu_bulk_data *)
-                               __get_free_page(GFP_KERNEL | 
__GFP_RETRY_MAYFAIL | __GFP_NOWARN);
+                               __get_free_page(GFP_KERNEL | 
__GFP_RETRY_MAYFAIL | __GFP_NOMEMALLOC | __GFP_NOWARN);
                        *krcp = krc_this_cpu_lock(flags);
                }
 
-- 
2.9.5