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authorIngo Molnar <mingo@elte.hu>2008-07-14 10:28:38 +0200
committerIngo Molnar <mingo@elte.hu>2008-07-14 10:32:14 +0200
commit992860e991f2015fb8c8df65aa32afa0dcbb4430 (patch)
treef8e9015b00e3f14be77af640de9e3d60c8fa470b /kernel/lockdep.c
parentb4ba0ba24b57ec975482f4ba2d350fbee7557240 (diff)
downloadop-kernel-dev-992860e991f2015fb8c8df65aa32afa0dcbb4430.zip
op-kernel-dev-992860e991f2015fb8c8df65aa32afa0dcbb4430.tar.gz
lockdep: fix ftrace irq tracing false positive
fix this false positive: [ 0.020000] ------------[ cut here ]------------ [ 0.020000] WARNING: at kernel/lockdep.c:2718 check_flags+0x14a/0x170() [ 0.020000] Modules linked in: [ 0.020000] Pid: 0, comm: swapper Not tainted 2.6.26-tip-00343-gd7e5521-dirty #14486 [ 0.020000] [<c01312e4>] warn_on_slowpath+0x54/0x80 [ 0.020000] [<c067e451>] ? _spin_unlock_irqrestore+0x61/0x70 [ 0.020000] [<c0131bb1>] ? release_console_sem+0x201/0x210 [ 0.020000] [<c0143d65>] ? __kernel_text_address+0x35/0x40 [ 0.020000] [<c010562e>] ? dump_trace+0x5e/0x140 [ 0.020000] [<c01518b5>] ? __lock_acquire+0x245/0x820 [ 0.020000] [<c015063a>] check_flags+0x14a/0x170 [ 0.020000] [<c0151ed8>] ? lock_acquire+0x48/0xc0 [ 0.020000] [<c0151ee1>] lock_acquire+0x51/0xc0 [ 0.020000] [<c014a16c>] ? down+0x2c/0x40 [ 0.020000] [<c010a609>] ? sched_clock+0x9/0x10 [ 0.020000] [<c067e7b2>] _write_lock+0x32/0x60 [ 0.020000] [<c013797f>] ? request_resource+0x1f/0xb0 [ 0.020000] [<c013797f>] request_resource+0x1f/0xb0 [ 0.020000] [<c02f89ad>] vgacon_startup+0x2bd/0x3e0 [ 0.020000] [<c094d62a>] con_init+0x19/0x22f [ 0.020000] [<c0330c7c>] ? tty_register_ldisc+0x5c/0x70 [ 0.020000] [<c094cf49>] console_init+0x20/0x2e [ 0.020000] [<c092a969>] start_kernel+0x20c/0x379 [ 0.020000] [<c092a516>] ? unknown_bootoption+0x0/0x1f6 [ 0.020000] [<c092a099>] __init_begin+0x99/0xa1 [ 0.020000] ======================= [ 0.020000] ---[ end trace 4eaa2a86a8e2da22 ]--- [ 0.020000] possible reason: unannotated irqs-on. [ 0.020000] irq event stamp: 0 which occurs if CONFIG_TRACE_IRQFLAGS=y, CONFIG_DEBUG_LOCKDEP=y, but CONFIG_PROVE_LOCKING is disabled. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/lockdep.c')
-rw-r--r--kernel/lockdep.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 7553a28..fc5d5aa 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2688,7 +2688,8 @@ __lock_release(struct lockdep_map *lock, int nested, unsigned long ip)
*/
static void check_flags(unsigned long flags)
{
-#if defined(CONFIG_DEBUG_LOCKDEP) && defined(CONFIG_TRACE_IRQFLAGS)
+#if defined(CONFIG_PROVE_LOCKING) && defined(CONFIG_DEBUG_LOCKDEP) && \
+ defined(CONFIG_TRACE_IRQFLAGS)
if (!debug_locks)
return;
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