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tile: various minor cleanups to hardwall subsystem

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First, clean up active hardwalls in exit_thread().  This is a better
place than in arch_release_thread_info().

Second, mask out any non-online cpus from the cpumask after
validating any required semantics of the cpu set.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf 2013-07-23 17:18:05 -04:00
parent 8e42e211e4
commit 7d937719e3
2 changed files with 18 additions and 15 deletions
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10
arch/tile/kernel/hardwall.c
View File

@ -540,6 +540,14 @@ static struct hardwall_info *hardwall_create(struct hardwall_type *hwt,
}
}
/*
* Eliminate cpus that are not part of this Linux client.
* Note that this allows for configurations that we might not want to
* support, such as one client on every even cpu, another client on
* every odd cpu.
*/
cpumask_and(&info->cpumask, &info->cpumask, cpu_online_mask);
/* Confirm it doesn't overlap and add it to the list. */
spin_lock_irqsave(&hwt->lock, flags);
list_for_each_entry(iter, &hwt->list, list) {
@ -612,7 +620,7 @@ static int hardwall_activate(struct hardwall_info *info)
/*
* Deactivate a task's hardwall. Must hold lock for hardwall_type.
* This method may be called from free_task(), so we don't want to
* This method may be called from exit_thread(), so we don't want to
* rely on too many fields of struct task_struct still being valid.
* We assume the cpus_allowed, pid, and comm fields are still valid.
*/

23
arch/tile/kernel/process.c
View File

@ -74,19 +74,6 @@ void arch_release_thread_info(struct thread_info *info)
{
struct single_step_state *step_state = info->step_state;
#ifdef CONFIG_HARDWALL
/*
* We free a thread_info from the context of the task that has
* been scheduled next, so the original task is already dead.
* Calling deactivate here just frees up the data structures.
* If the task we're freeing held the last reference to a
* hardwall fd, it would have been released prior to this point
* anyway via exit_files(), and the hardwall_task.info pointers
* would be NULL by now.
*/
hardwall_deactivate_all(info->task);
#endif
if (step_state) {
/*
@ -564,7 +551,15 @@ void flush_thread(void)
*/
void exit_thread(void)
{
/* Nothing */
#ifdef CONFIG_HARDWALL
/*
* Remove the task from the list of tasks that are associated
* with any live hardwalls. (If the task that is exiting held
* the last reference to a hardwall fd, it would already have
* been released and deactivated at this point.)
*/
hardwall_deactivate_all(current);
#endif
}
void show_regs(struct pt_regs *regs)