tile: various minor cleanups to hardwall subsystem

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>

1 files changed, 9 insertions, 14 deletions

diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 8ac304484f98..8d6c51d55762 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -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)