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Subject[RFC][PATCH 07/10] Task watchers v2 Register IRQ flag tracing task watcher
Register an irq-flag-tracing task watcher instead of hooking into
copy_process().

Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
---
kernel/fork.c | 19 -------------------
kernel/irq/handle.c | 24 ++++++++++++++++++++++++
2 files changed, 24 insertions(+), 19 deletions(-)
Index: linux-2.6.18-mm1/kernel/fork.c
===================================================================
--- linux-2.6.18-mm1.orig/kernel/fork.c
+++ linux-2.6.18-mm1/kernel/fork.c
@@ -1058,29 +1058,10 @@ static struct task_struct *copy_process(
p->tgid = current->tgid;

retval = notify_task_watchers(WATCH_TASK_INIT, clone_flags, p);
if (retval < 0)
goto bad_fork_cleanup_delays_binfmt;
-#ifdef CONFIG_TRACE_IRQFLAGS
- p->irq_events = 0;
-#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
- p->hardirqs_enabled = 1;
-#else
- p->hardirqs_enabled = 0;
-#endif
- 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
#ifdef CONFIG_LOCKDEP
p->lockdep_depth = 0; /* no locks held yet */
p->curr_chain_key = 0;
p->lockdep_recursion = 0;
#endif
Index: linux-2.6.18-mm1/kernel/irq/handle.c
===================================================================
--- linux-2.6.18-mm1.orig/kernel/irq/handle.c
+++ linux-2.6.18-mm1/kernel/irq/handle.c
@@ -13,10 +13,11 @@
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
+#include <linux/task_watchers.h>

#include "internals.h"

/**
* handle_bad_irq - handle spurious and unhandled irqs
@@ -269,6 +270,29 @@ void early_init_irq_lock_class(void)

for (i = 0; i < NR_IRQS; i++)
lockdep_set_class(&irq_desc[i].lock, &irq_desc_lock_class);
}

+static int init_task_trace_irqflags(unsigned long clone_flags,
+ struct task_struct *p)
+{
+ p->irq_events = 0;
+#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
+ p->hardirqs_enabled = 1;
+#else
+ p->hardirqs_enabled = 0;
+#endif
+ 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;
+ return 0;
+}
+task_watcher_func(init, init_task_trace_irqflags);
#endif
--
-
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