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author | Ingo Molnar <mingo@elte.hu> | 2006-11-17 19:57:22 +0100 |
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committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-11-17 11:10:37 -0800 |
commit | 1ff5683043196b9ad628a5de6bf8eeca52ee8bfd (patch) | |
tree | 01e2f0a382ff33623993f77997f38768560e5f2a | |
parent | dc1829a4c378d793fb3b95d56135d89a0d7ff72a (diff) | |
download | linux-1ff5683043196b9ad628a5de6bf8eeca52ee8bfd.tar.gz |
[PATCH] lockdep: fix static keys in module-allocated percpu areas
lockdep got confused by certain locks in modules: INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. Call Trace: [<ffffffff8026f40d>] dump_trace+0xaa/0x3f2 [<ffffffff8026f78f>] show_trace+0x3a/0x60 [<ffffffff8026f9d1>] dump_stack+0x15/0x17 [<ffffffff802abfe8>] __lock_acquire+0x724/0x9bb [<ffffffff802ac52b>] lock_acquire+0x4d/0x67 [<ffffffff80267139>] rt_spin_lock+0x3d/0x41 [<ffffffff8839ed3f>] :ip_conntrack:__ip_ct_refresh_acct+0x131/0x174 [<ffffffff883a1334>] :ip_conntrack:udp_packet+0xbf/0xcf [<ffffffff8839f9af>] :ip_conntrack:ip_conntrack_in+0x394/0x4a7 [<ffffffff8023551f>] nf_iterate+0x41/0x7f [<ffffffff8025946a>] nf_hook_slow+0x64/0xd5 [<ffffffff802369a2>] ip_rcv+0x24e/0x506 [...] Steven Rostedt found the bug: static_obj() check did not take PERCPU_ENOUGH_ROOM into account, so in-module DEFINE_PER_CPU-area locks were triggering this message. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r-- | kernel/lockdep.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index b739be2a6dc9..c9fefdb1a7db 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -1081,7 +1081,8 @@ static int static_obj(void *obj) */ for_each_possible_cpu(i) { start = (unsigned long) &__per_cpu_start + per_cpu_offset(i); - end = (unsigned long) &__per_cpu_end + per_cpu_offset(i); + end = (unsigned long) &__per_cpu_start + PERCPU_ENOUGH_ROOM + + per_cpu_offset(i); if ((addr >= start) && (addr < end)) return 1; |