Re: [PATCH] x86: avoid calling arch_trigger_all_cpu_backtrace() atthe same time on SMP

[Eric Dumazet]

Le jeudi 11 novembre 2010 Ã 10:23 +0100, Ingo Molnar a Ãcrit :

> 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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