xtensa: add handling of TIF_NOTIFY_RESUME

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

2 files changed, 19 insertions, 6 deletions

diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index b1bb6d79d8b9..7e6236073397 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -409,14 +409,15 @@ common_exception_return:
         l32i    a4, a2, TI_FLAGS
 
         _bbsi.l a4, TIF_NEED_RESCHED, 3f
+        _bbsi.l a4, TIF_NOTIFY_RESUME, 2f
         _bbci.l a4, TIF_SIGPENDING, 4f
 
-        l32i    a4, a1, PT_DEPC
+2:      l32i    a4, a1, PT_DEPC
         bgeui   a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 4f
 
         /* Call do_signal() */
 
-        movi    a4, do_signal   # int do_signal(struct pt_regs*, sigset_t*)
+        movi    a4, do_notify_resume    # int do_notify_resume(struct pt_regs*)
         mov     a6, a1
         callx4  a4
         j       1b
diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c
index bb00cc470ca9..c5e4ec0598d2 100644
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -20,6 +20,7 @@
 #include <linux/ptrace.h>
 #include <linux/personality.h>
 #include <linux/freezer.h>
+#include <linux/tracehook.h>
 
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
@@ -446,16 +447,13 @@ asmlinkage long xtensa_sigaltstack(const stack_t __user *uss,
  * the kernel can handle, and then we build all the user-level signal handling
  * stack-frames in one go after that.
  */
-void do_signal(struct pt_regs *regs)
+static void do_signal(struct pt_regs *regs)
 {
         siginfo_t info;
         int signr;
         struct k_sigaction ka;
         sigset_t oldset;
 
-        if (!user_mode(regs))
-                return;
-
         if (try_to_freeze())
                 goto no_signal;
 
@@ -542,3 +540,17 @@ no_signal:
         return;
 }
 
+void do_notify_resume(struct pt_regs *regs)
+{
+        if (!user_mode(regs))
+                return;
+
+        if (test_thread_flag(TIF_SIGPENDING))
+                do_signal(regs);
+
+        if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) {
+                tracehook_notify_resume(regs);
+                if (current->replacement_session_keyring)
+                        key_replace_session_keyring();
+        }
+}