Messages in this thread | | | Subject | Re: [PATCH] x86: avoid calling arch_trigger_all_cpu_backtrace() at the same time on SMP | From | Eric Dumazet <> | Date | Thu, 11 Nov 2010 10:51:44 +0100 |
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Le jeudi 11 novembre 2010 à 10:23 +0100, Ingo Molnar a écrit :
> Also, variables that cmpxchg or test_and_set operates on need to be long, not int.
Hmm, ok for test_and_set(), it operates on a long.
cmpxchg() is ok on an int AFAIK. If not we have to make some changes :(
btrfs_orphan_cleanup() for example does this :
if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) ...
Same in build_ehash_secret() (net/ipv4/af_inet.c)
cmpxchg(&inet_ehash_secret, 0, rnd);
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