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authorEric Dumazet <dada1@cosmosbay.com>2007-12-24 20:57:56 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 15:00:05 -0800
commit21371f768bf7127ee45bfaadd17899df6a439e8f (patch)
tree91b5debf1d861a40c942a33f1286b70031a94305 /net
parentb15c4bcd15741b31019379298edfca28dc78029d (diff)
downloadop-kernel-dev-21371f768bf7127ee45bfaadd17899df6a439e8f.zip
op-kernel-dev-21371f768bf7127ee45bfaadd17899df6a439e8f.tar.gz
[SOCK] Avoid divides in sk_stream_pages() and __sk_stream_mem_reclaim()
sk_forward_alloc being signed, we should take care of divides by SK_STREAM_MEM_QUANTUM we do in sk_stream_pages() and __sk_stream_mem_reclaim() This patchs introduces SK_STREAM_MEM_QUANTUM_SHIFT, defined as ilog2(SK_STREAM_MEM_QUANTUM), to be able to use right shifts instead of plain divides. This should help compiler to choose right shifts instead of expensive divides (as seen with CONFIG_CC_OPTIMIZE_FOR_SIZE=y on x86) Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/stream.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/stream.c b/net/core/stream.c
index 5586879..bf188ff 100644
--- a/net/core/stream.c
+++ b/net/core/stream.c
@@ -196,7 +196,7 @@ EXPORT_SYMBOL(sk_stream_error);
void __sk_stream_mem_reclaim(struct sock *sk)
{
- atomic_sub(sk->sk_forward_alloc / SK_STREAM_MEM_QUANTUM,
+ atomic_sub(sk->sk_forward_alloc >> SK_STREAM_MEM_QUANTUM_SHIFT,
sk->sk_prot->memory_allocated);
sk->sk_forward_alloc &= SK_STREAM_MEM_QUANTUM - 1;
if (*sk->sk_prot->memory_pressure &&
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