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| author | David S. Miller <davem@davemloft.net> | 2011-02-17 01:56:22 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-02-18 02:49:26 +0300 |
| commit | 3b004569d86d02786ebae496e75dc0b625be3e9a (patch) | |
| tree | c345e28b1478ee37755b6d5d061a586308fe033c /net/ipv4/fib_trie.c | |
| parent | 3c7bd1a14071b99d6535b710bc998ae5d3abbb66 (diff) | |
| download | linux-3b004569d86d02786ebae496e75dc0b625be3e9a.tar.xz | |
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>
Diffstat (limited to 'net/ipv4/fib_trie.c')
| -rw-r--r-- | net/ipv4/fib_trie.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c index 1eae90b054eb..edf3b0997e01 100644 --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -217,12 +217,12 @@ static inline int tnode_child_length(const struct tnode *tn) return 1 << tn->bits; } -static inline t_key mask_pfx(t_key k, unsigned short l) +static inline t_key mask_pfx(t_key k, unsigned int l) { return (l == 0) ? 0 : k >> (KEYLENGTH-l) << (KEYLENGTH-l); } -static inline t_key tkey_extract_bits(t_key a, int offset, int bits) +static inline t_key tkey_extract_bits(t_key a, unsigned int offset, unsigned int bits) { if (offset < KEYLENGTH) return ((t_key)(a << offset)) >> (KEYLENGTH - bits); @@ -1378,11 +1378,11 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi *flp, int ret; struct rt_trie_node *n; struct tnode *pn; - int pos, bits; + unsigned int pos, bits; t_key key = ntohl(flp->fl4_dst); - int chopped_off; + unsigned int chopped_off; t_key cindex = 0; - int current_prefix_length = KEYLENGTH; + unsigned int current_prefix_length = KEYLENGTH; struct tnode *cn; t_key pref_mismatch; |