netdev - [PATCH] fib

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Date:	Fri, 16 Mar 2007 13:38:31 +0100
From:	Robert Olsson <Robert.Olsson@...a.slu.se>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Robert.Olsson@...a.slu.se, kaber@...sh.net,
	tgr@...g.ch, Jens.Laas@...a.slu.se, hans.liss@....uu.se
Subject: [PATCH] fib_hash removal


Hello, Just discussed this Patrick...

We have two users of trie_leaf_remove, fn_trie_flush and fn_trie_delete 
both are holding RTNL. So there shouldn't be need for this preempt stuff. 
This is assumed to a leftover from an older RCU-take.

> Mhh .. I think I just remembered something - me incorrectly suggesting
> to add it there while we were talking about this at OLS :) IIRC the
> idea was to make sure tnode_free (which at that time didn't use
> call_rcu) wouldn't free memory while still in use in a rcu read-side
> critical section. It should have been synchronize_rcu of course,
> but with tnode_free using call_rcu it seems to be completely
> unnecessary. So I guess we can simply remove it.

Signed-off-by: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Robert Olsson <robert.olsson@....uu.se>

Cheers.
					--ro


diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1534,7 +1534,6 @@ static int trie_leaf_remove(struct trie 
 	t->revision++;
 	t->size--;
 
-	preempt_disable();
 	tp = NODE_PARENT(n);
 	tnode_free((struct tnode *) n);
 
@@ -1544,7 +1543,6 @@ static int trie_leaf_remove(struct trie 
 		rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
 	} else
 		rcu_assign_pointer(t->trie, NULL);
-	preempt_enable();
 
 	return 1;
 }

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