um: add TIF_NOTIFY_RESUME

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 8 insertions, 1 deletions

diff --git a/arch/um/include/asm/thread_info.h b/arch/um/include/asm/thread_info.h
index 200c4ab1240c..6d85ebb860fd 100644
--- a/arch/um/include/asm/thread_info.h
+++ b/arch/um/include/asm/thread_info.h
@@ -71,6 +71,7 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_MEMDIE              5       /* is terminating due to OOM killer */
 #define TIF_SYSCALL_AUDIT       6
 #define TIF_RESTORE_SIGMASK     7
+#define TIF_NOTIFY_RESUME       8
 
 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 2b73dedb44ca..4d9af3172d9f 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -18,6 +18,7 @@
 #include <linux/seq_file.h>
 #include <linux/tick.h>
 #include <linux/threads.h>
+#include <linux/tracehook.h>
 #include <asm/current.h>
 #include <asm/pgtable.h>
 #include <asm/mmu_context.h>
@@ -114,8 +115,13 @@ void interrupt_end(void)
 {
         if (need_resched())
                 schedule();
-        if (test_tsk_thread_flag(current, TIF_SIGPENDING))
+        if (test_thread_flag(TIF_SIGPENDING))
                 do_signal();
+        if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) {
+                tracehook_notify_resume(&current->thread.regs);
+                if (current->replacement_session_keyring)
+                        key_replace_session_keyring();
+        }
 }
 
 void exit_thread(void)