From: David S. Miller <davem@davemloft.net>
Date: Wed, 16 Feb 2011 22:56:22 +0000 (-0800)
Subject: ipv4: Avoid use of signed integers in fib_trie code.
X-Git-Tag: v2.6.39-rc1~468^2~330
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3b004569d86d02786ebae496e75dc0b625be3e9a;p=pandora-kernel.git

ipv4: Avoid use of signed integers in fib_trie code.

GCC emits all kinds of crazy zero extensions when we go from signed
int, to unsigned short, etc. etc.

This transformation has to be legal because:

1) In tkey_extract_bits() in mask_pfx(), the values are used to
   perform shifts, on which negative values are undefined by C.

2) In fib_table_lookup() we perform comparisons with unsigned
   values, constants, and additions.  None of which should
   encounter negative values.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

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