X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=fs%2Fexec.c;h=963f510a25ab50013e9b0fbeac055570dc8af235;hb=657a52095fa3e8560d41047851f4e73a410f3ed2;hp=a96a4885bbbfa130750caa70b9b3f504ea10b244;hpb=3792a64fdeeb9cab56c22695aaeb0624f1b295b4;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

diff --git a/fs/exec.c b/fs/exec.c
index a96a488..963f510 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -613,7 +613,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift)
 		 * when the old and new regions overlap clear from new_end.
 		 */
 		free_pgd_range(&tlb, new_end, old_end, new_end,
-			vma->vm_next ? vma->vm_next->vm_start : 0);
+			vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING);
 	} else {
 		/*
 		 * otherwise, clean from old_start; this is done to not touch
@@ -622,7 +622,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift)
 		 * for the others its just a little faster.
 		 */
 		free_pgd_range(&tlb, old_start, old_end, new_end,
-			vma->vm_next ? vma->vm_next->vm_start : 0);
+			vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING);
 	}
 	tlb_finish_mmu(&tlb, new_end, old_end);
 
@@ -898,11 +898,13 @@ static int de_thread(struct task_struct *tsk)
 
 		sig->notify_count = -1;	/* for exit_notify() */
 		for (;;) {
+			threadgroup_change_begin(tsk);
 			write_lock_irq(&tasklist_lock);
 			if (likely(leader->exit_state))
 				break;
 			__set_current_state(TASK_KILLABLE);
 			write_unlock_irq(&tasklist_lock);
+			threadgroup_change_end(tsk);
 			schedule();
 			if (unlikely(__fatal_signal_pending(tsk)))
 				goto killed;
@@ -960,6 +962,7 @@ static int de_thread(struct task_struct *tsk)
 		if (unlikely(leader->ptrace))
 			__wake_up_parent(leader, leader->parent);
 		write_unlock_irq(&tasklist_lock);
+		threadgroup_change_end(tsk);
 
 		release_task(leader);
 	}
@@ -1027,17 +1030,7 @@ EXPORT_SYMBOL_GPL(get_task_comm);
 void set_task_comm(struct task_struct *tsk, char *buf)
 {
 	task_lock(tsk);
-
 	trace_task_rename(tsk, buf);
-
-	/*
-	 * Threads may access current->comm without holding
-	 * the task lock, so write the string carefully.
-	 * Readers without a lock may see incomplete new
-	 * names but are safe from non-terminating string reads.
-	 */
-	memset(tsk->comm, 0, TASK_COMM_LEN);
-	wmb();
 	strlcpy(tsk->comm, buf, sizeof(tsk->comm));
 	task_unlock(tsk);
 	perf_event_comm(tsk);