>
> +/*
> + * trigger a reschedule on all other CPUs:
> + */
> +extern void smp_send_reschedule_allbutself(void);
> +
> +/*
> + * trigger a reschedule on all other CPUs:
> + */
> +extern void smp_send_reschedule_allbutself(void);
> +
just to make sure the C compiler doesn't forget it ?
or maybe the parser is suffering from memory lapse ? ;)
>
> -#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
> +#if defined(CONFIG_DEBUG_SPINLOCK_SLEEP) || defined(CONFIG_DEBUG_PREEMPT)
why this change? the change is for spinlock debugging.. why add preempt
to this?
> void __might_sleep(char *file, int line);
> # define might_sleep() \
> do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
> @@ -198,6 +198,7 @@ extern void add_taint(unsigned);
> /* Values used for system_state */
> extern enum system_states {
> SYSTEM_BOOTING,
> + SYSTEM_BOOTING_SCHEDULER_OK,
what is this used for? your patch doesn't add users of this...
> SYSTEM_RUNNING,
> SYSTEM_HALT,
> SYSTEM_POWER_OFF,
> --- linux-2.6.22.orig/init/main.c
> +++ linux-2.6.22/init/main.c
> @@ -438,6 +438,8 @@ static void noinline __init_refok rest_i
> {
> int pid;
>
> + system_state = SYSTEM_BOOTING_SCHEDULER_OK;
> +
> kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
> numa_default_policy();
> pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
> --- linux-2.6.22.orig/lib/kernel_lock.c
> +++ linux-2.6.22/lib/kernel_lock.c
> @@ -35,22 +35,25 @@ DECLARE_MUTEX(kernel_sem);
> * about recursion, both due to the down() and due to the enabling of
> * preemption. schedule() will re-check the preemption flag after
> * reacquiring the semaphore.
> + *
> + * Called with interrupts disabled.
> */
> int __lockfunc __reacquire_kernel_lock(void)
> {
> struct task_struct *task = current;
> int saved_lock_depth = task->lock_depth;
>
> + local_irq_enable();
eh... if interrupts are off here that's a bad bug. Why work around it?
> BUG_ON(saved_lock_depth < 0);
>
> task->lock_depth = -1;
> - __preempt_enable_no_resched();
>
> down(&kernel_sem);
>
> - preempt_disable();
> task->lock_depth = saved_lock_depth;
>
> + local_irq_disable();
> +
same here..
> int __lockfunc __reacquire_kernel_lock(void)
> {
> - while (!_raw_spin_trylock(&kernel_flag)) {
> - if (test_thread_flag(TIF_NEED_RESCHED))
> - return -EAGAIN;
> - cpu_relax();
> - }
> + local_irq_enable();
> + _raw_spin_lock(&kernel_flag);
> + local_irq_disable();
are you sure you want this semantics change?
-
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