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tcp: replace hard coded GFP_KERNEL with sk_allocation

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This fixed a lockdep warning which appeared when doing stress
memory tests over NFS:

	inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.

	page reclaim => nfs_writepage => tcp_sendmsg => lock sk_lock

	mount_root => nfs_root_data => tcp_close => lock sk_lock =>
			tcp_send_fin => alloc_skb_fclone => page reclaim

David raised a concern that if the allocation fails in tcp_send_fin(), and it's
GFP_ATOMIC, we are going to yield() (which sleeps) and loop endlessly waiting
for the allocation to succeed.

But fact is, the original GFP_KERNEL also sleeps. GFP_ATOMIC+yield() looks
weird, but it is no worse the implicit sleep inside GFP_KERNEL. Both could
loop endlessly under memory pressure.

CC: Arnaldo Carvalho de Melo <[email protected]>
CC: David S. Miller <[email protected]>
CC: Herbert Xu <[email protected]>
Signed-off-by: Wu Fengguang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Wu Fengguang 2009-09-02 23:45:45 -07:00 • committed by David S. Miller
commit aa1330766c
6 changed files with 15 additions and 13 deletions
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2
net/ipv6/tcp_ipv6.c
View file

@ -591,7 +591,7 @@ static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
}
sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
}
if (tcp_alloc_md5sig_pool() == NULL) {
if (tcp_alloc_md5sig_pool(sk) == NULL) {
kfree(newkey);
return -ENOMEM;
}