ARM: Convert VFP/Crunch/XscaleCP thread_release() to exit_thread()

This avoids races in the VFP code where the dead thread may have
state on another CPU.  By moving this code to exit_thread(), we
will be running as the thread, and therefore be running on the
current CPU.

This means that we can ensure that the only local state is accessed
in the thread notifiers.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 11 insertions, 8 deletions

diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index aed05bc3c2ea..f60a5400a25b 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -63,14 +63,15 @@ static void vfp_thread_flush(struct thread_info *thread)
 	put_cpu();
 }
 
-static void vfp_thread_release(struct thread_info *thread)
+static void vfp_thread_exit(struct thread_info *thread)
 {
 	/* release case: Per-thread VFP cleanup. */
 	union vfp_state *vfp = &thread->vfpstate;
-	unsigned int cpu = thread->cpu;
+	unsigned int cpu = get_cpu();
 
 	if (last_VFP_context[cpu] == vfp)
 		last_VFP_context[cpu] = NULL;
+	put_cpu();
 }
 
 /*
@@ -88,11 +89,13 @@ static void vfp_thread_release(struct thread_info *thread)
  *	but may change at any time.
  *   - we could be preempted if tree preempt rcu is enabled, so
  *	it is unsafe to use thread->cpu.
- *  THREAD_NOTIFY_RELEASE:
- *   - the thread (v) will not be running on any CPU; it is a dead thread.
- *   - thread->cpu will be the last CPU the thread ran on, which may not
- *	be the current CPU.
- *   - we could be preempted if tree preempt rcu is enabled.
+ *  THREAD_NOTIFY_EXIT
+ *   - the thread (v) will be running on the local CPU, so
+ *	v === current_thread_info()
+ *   - thread->cpu is the local CPU number at the time it is accessed,
+ *	but may change at any time.
+ *   - we could be preempted if tree preempt rcu is enabled, so
+ *	it is unsafe to use thread->cpu.
  */
 static int vfp_notifier(struct notifier_block *self, unsigned long cmd, void *v)
 {
@@ -133,7 +136,7 @@ static int vfp_notifier(struct notifier_block *self, unsigned long cmd, void *v)
 	if (cmd == THREAD_NOTIFY_FLUSH)
 		vfp_thread_flush(thread);
 	else
-		vfp_thread_release(thread);
+		vfp_thread_exit(thread);
 
 	return NOTIFY_DONE;
 }