From c3fc5cd5c5a5f4738776a965a020a32c1a37c8fd Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 29 May 2013 01:07:19 +0200
Subject: MIPS: Implement HAVE_CONTEXT_TRACKING.

This enables support for CONFIG_NO_HZ_FULL.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
 arch/mips/kernel/ptrace.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'arch/mips/kernel/ptrace.c')

diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 9c6299c733a3..8ae1ebef8b71 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -15,6 +15,7 @@
  * binaries.
  */
 #include <linux/compiler.h>
+#include <linux/context_tracking.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
@@ -534,6 +535,8 @@ static inline int audit_arch(void)
  */
 asmlinkage void syscall_trace_enter(struct pt_regs *regs)
 {
+	user_exit();
+
 	/* do the secure computing check first */
 	secure_computing_strict(regs->regs[2]);
 
@@ -570,6 +573,13 @@ out:
  */
 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
 {
+        /*
+	 * We may come here right after calling schedule_user()
+	 * or do_notify_resume(), in which case we can be in RCU
+	 * user mode.
+	 */
+	user_exit();
+
 	audit_syscall_exit(regs);
 
 	if (!(current->ptrace & PT_PTRACED))
@@ -592,4 +602,6 @@ asmlinkage void syscall_trace_leave(struct pt_regs *regs)
 		send_sig(current->exit_code, current, 1);
 		current->exit_code = 0;
 	}
+
+	user_enter();
 }
-- 
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