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authorIngo Molnar <mingo@elte.hu>2006-07-03 00:24:42 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:03 -0700
commitde30a2b355ea85350ca2f58f3b9bf4e5bc007986 (patch)
tree0bef670aff65614b3c78ca13b20307355b8221d5 /kernel/fork.c
parent5bdc9b447c0076f494a56fdcd93ee8c5e78a2afd (diff)
downloadlwn-de30a2b355ea85350ca2f58f3b9bf4e5bc007986.tar.gz
lwn-de30a2b355ea85350ca2f58f3b9bf4e5bc007986.zip
[PATCH] lockdep: irqtrace subsystem, core
Accurate hard-IRQ-flags and softirq-flags state tracing. This allows us to attach extra functionality to IRQ flags on/off events (such as trace-on/off). Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 1cd46a4fb0d3..b7db7fb74f53 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -968,6 +968,10 @@ static task_t *copy_process(unsigned long clone_flags,
if (!p)
goto fork_out;
+#ifdef CONFIG_TRACE_IRQFLAGS
+ DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
+ DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
+#endif
retval = -EAGAIN;
if (atomic_read(&p->user->processes) >=
p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
@@ -1042,6 +1046,21 @@ static task_t *copy_process(unsigned long clone_flags,
}
mpol_fix_fork_child_flag(p);
#endif
+#ifdef CONFIG_TRACE_IRQFLAGS
+ p->irq_events = 0;
+ p->hardirqs_enabled = 0;
+ p->hardirq_enable_ip = 0;
+ p->hardirq_enable_event = 0;
+ p->hardirq_disable_ip = _THIS_IP_;
+ p->hardirq_disable_event = 0;
+ p->softirqs_enabled = 1;
+ p->softirq_enable_ip = _THIS_IP_;
+ p->softirq_enable_event = 0;
+ p->softirq_disable_ip = 0;
+ p->softirq_disable_event = 0;
+ p->hardirq_context = 0;
+ p->softirq_context = 0;
+#endif
rt_mutex_init_task(p);