From: Eric Dumazet <dada1@cosmosbay.com>
Date: Tue, 5 Jul 2005 22:00:32 +0000 (-0700)
Subject: [IPV4]: Bug fix in rt_check_expire()
X-Git-Tag: v2.6.13-rc2~6^2~24
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bb1d23b02657f494dff295f6cdd1f29df30fa61e;p=pandora-kernel.git

[IPV4]: Bug fix in rt_check_expire()

- rt_check_expire() fixes (an overflow occured if size of the hash
  was >= 65536)

reminder of the bugfix:

The rt_check_expire() has a serious problem on machines with large
route caches, and a standard HZ value of 1000.

With default values, ie ip_rt_gc_interval = 60*HZ = 60000 ;

the loop count :

     for (t = ip_rt_gc_interval << rt_hash_log; t >= 0;


overflows (t is a 31 bit value) as soon rt_hash_log is >= 16  (65536
slots in route cache hash table).

In this case, rt_check_expire() does nothing at all

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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