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v0.5.1
https://github.com/torvalds/linux
02 December 2023, 22:23:51 UTC
Revision cfebe563bd0a3ff97e1bc167123120d59c7a84db authored by Li Zefan on 11 February 2009, 21:04:36 UTC, committed by Linus Torvalds on 11 February 2009, 22:25:36 UTC 
cgroups: fix lockdep subclasses overflow
 
I enabled all cgroup subsystems when compiling kernel, and then:
 # mount -t cgroup -o net_cls xxx /mnt
 # mkdir /mnt/0

This showed up immediately:
 BUG: MAX_LOCKDEP_SUBCLASSES too low!
 turning off the locking correctness validator.

It's caused by the cgroup hierarchy lock:
	for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
		struct cgroup_subsys *ss = subsys[i];
		if (ss->root == root)
			mutex_lock_nested(&ss->hierarchy_mutex, i);
	}

Now we have 9 cgroup subsystems, and the above 'i' for net_cls is 8, but
MAX_LOCKDEP_SUBCLASSES is 8.

This patch uses different lockdep keys for different subsystems.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 01c4a42
History
Tip revision: cfebe563bd0a3ff97e1bc167123120d59c7a84db authored by Li Zefan on 11 February 2009, 21:04:36 UTC
cgroups: fix lockdep subclasses overflow
Tip revision: cfebe56
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