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authorAndi Kleen <ak@suse.de>2008-04-03 17:07:02 -0400
committerDavid S. Miller <davem@davemloft.net>2008-04-03 17:07:02 -0400
commit61407f80f72970d52d4339f81c6c3cd03f4ca0f0 (patch)
tree2063040e6e16d5dcc1024c3aedee23195f38b1ba /lib/random32.c
parent84f59370c519449c70dcc813b050f5cbbf0098e7 (diff)
[NET]: srandom32 fixes for networking v2
- Let it update the state of all CPUs. The network stack goes into pains to feed the current IP addresses in, but it is not very effective if that is only done for some random CPU instead of all. So change it to feed bits into all CPUs. I decided to do that lockless because well somewhat random results are ok. v2: Drop rename so that this patch doesn't depend on x86 maintainers Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/random32.c')
-rw-r--r--lib/random32.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/lib/random32.c b/lib/random32.c
index ec7f81d3fb18..ca87d86992bd 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -97,13 +97,18 @@ EXPORT_SYMBOL(random32);
97 * @seed: seed value 97 * @seed: seed value
98 * 98 *
99 * Add some additional seeding to the random32() pool. 99 * Add some additional seeding to the random32() pool.
100 * Note: this pool is per cpu so it only affects current CPU.
101 */ 100 */
102void srandom32(u32 entropy) 101void srandom32(u32 entropy)
103{ 102{
104 struct rnd_state *state = &get_cpu_var(net_rand_state); 103 int i;
105 __set_random32(state, state->s1 ^ entropy); 104 /*
106 put_cpu_var(state); 105 * No locking on the CPUs, but then somewhat random results are, well,
106 * expected.
107 */
108 for_each_possible_cpu (i) {
109 struct rnd_state *state = &per_cpu(net_rand_state, i);
110 __set_random32(state, state->s1 ^ entropy);
111 }
107} 112}
108EXPORT_SYMBOL(srandom32); 113EXPORT_SYMBOL(srandom32);
109 114