From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jia-Ju Bai Subject: [PATCH] net: decnet: Replace GFP_ATOMIC with GFP_KERNEL in dn_route_init Date: Mon, 9 Apr 2018 22:10:35 +0800 Message-ID: <1523283035-25639-1-git-send-email-baijiaju1990@gmail.com> Cc: linux-decnet-user@lists.sourceforge.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jia-Ju Bai To: davem@davemloft.net, kafai@fb.com, weiwan@google.com, dsa@cumulusnetworks.com, johannes.berg@intel.com, fw@strlen.de Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org dn_route_init() is never called in atomic context. The call chain ending up at dn_route_init() is: [1] dn_route_init() <- decnet_init() decnet_init() is only set as a parameter of module_init(). Despite never getting called from atomic context, dn_route_init() calls __get_free_pages() with GFP_ATOMIC, which waits busily for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, to avoid busy waiting and improve the possibility of sucessful allocation. This is found by a static analysis tool named DCNS written by myself. And I also manually check it. Signed-off-by: Jia-Ju Bai --- net/decnet/dn_route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c index 0bd3afd..59ed12a 100644 --- a/net/decnet/dn_route.c +++ b/net/decnet/dn_route.c @@ -1898,7 +1898,7 @@ void __init dn_route_init(void) while(dn_rt_hash_mask & (dn_rt_hash_mask - 1)) dn_rt_hash_mask--; dn_rt_hash_table = (struct dn_rt_hash_bucket *) - __get_free_pages(GFP_ATOMIC, order); + __get_free_pages(GFP_KERNEL, order); } while (dn_rt_hash_table == NULL && --order > 0); if (!dn_rt_hash_table) -- 1.9.1