microblaze: evict the check for kernel_mode(regs) from do_notify_resume()

Only one caller hasn't done it in assembler - work_pending on !MMU.
Everything else can't reach do_notify_resume() if we are returning
to kernel mode, so move that check to that sole caller and make
do_notify_resume() reachable only when returning to userland.

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

2 files changed, 3 insertions, 9 deletions

diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S
index 70da83a49670..29a05d62ec1a 100644
--- a/arch/microblaze/kernel/entry-nommu.S
+++ b/arch/microblaze/kernel/entry-nommu.S
@@ -482,6 +482,8 @@ ENTRY(ret_from_kernel_thread)
         addk    r3, r0, r0
 
 work_pending:
+        lwi     r11, r1, PT_MODE
+        bneid   r11, 2f
         enable_irq
 
         andi    r11, r19, _TIF_NEED_RESCHED
@@ -507,6 +509,7 @@ ENTRY(ret_to_user)
 no_work_pending:
         disable_irq
 
+2:
         /* save r31 */
         swi     r31, r0, PER_CPU(CURRENT_SAVE)
         /* save mode indicator */
diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c
index dfd61e2f1189..9f7a8bde0686 100644
--- a/arch/microblaze/kernel/signal.c
+++ b/arch/microblaze/kernel/signal.c
@@ -343,15 +343,6 @@ static void do_signal(struct pt_regs *regs, int in_syscall)
 
 asmlinkage void do_notify_resume(struct pt_regs *regs, int in_syscall)
 {
-        /*
-         * We want the common case to go fast, which
-         * is why we may in certain cases get here from
-         * kernel mode. Just return without doing anything
-         * if so.
-         */
-        if (kernel_mode(regs))
-                return;
-
         if (test_thread_flag(TIF_SIGPENDING))
                 do_signal(regs, in_syscall);