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Message-Id: <1523323093-28196-1-git-send-email-baijiaju1990@gmail.com> Date: Tue, 10 Apr 2018 09:18:13 +0800 From: Jia-Ju Bai <baijiaju1990@...il.com> To: davem@...emloft.net, weiwan@...gle.com, kafai@...com, hannes@...essinduktion.org, fw@...len.de, dsa@...ulusnetworks.com, johannes.berg@...el.com Cc: linux-decnet-user@...ts.sourceforge.net, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com> Subject: [PATCH v2] net: decnet: Replace GFP_ATOMIC with GFP_KERNEL in dn_route_init 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 does not sleep for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which can sleep 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 <baijiaju1990@...il.com> --- v2: * Modify the description of GFP_ATOMIC in v1. Thank Eric for good advice. --- 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
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