sparc: keep calling do_signal() as long as pending signals remain

Analog of what commit 494486a1d2697f2153199b6501ab5b4d6e15a2bb had done
to alpha (another architecture with similar bug).

One note: in rtrap_32.S part clr %l6 has been a rudiment of left after
commit 28e6103665301ce60634e8a77f0b657c6cc099de (sparc: Fix debugger syscall
restart interactions) has killed %l6 use in there.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 6 insertions, 36 deletions

diff --git a/arch/sparc/kernel/rtrap_32.S b/arch/sparc/kernel/rtrap_32.S
index 4da2e1f6629..5f5f74c2c2c 100644
--- a/arch/sparc/kernel/rtrap_32.S
+++ b/arch/sparc/kernel/rtrap_32.S
@@ -78,9 +78,9 @@ signal_p:
         call    do_notify_resume
          add    %sp, STACKFRAME_SZ, %o0 ! pt_regs ptr
 
-        /* Fall through. */
-        ld      [%sp + STACKFRAME_SZ + PT_PSR], %t_psr
-        clr     %l6
+        b       signal_p
+         ld     [%curptr + TI_FLAGS], %g2
+
 ret_trap_continue:
         sethi   %hi(PSR_SYSCALL), %g1
         andn    %t_psr, %g1, %t_psr
diff --git a/arch/sparc/kernel/rtrap_64.S b/arch/sparc/kernel/rtrap_64.S
index 090b9e9ad5e..77f1b95e080 100644
--- a/arch/sparc/kernel/rtrap_64.S
+++ b/arch/sparc/kernel/rtrap_64.S
@@ -34,37 +34,9 @@ __handle_preemption:
 __handle_user_windows:
                 call                    fault_in_user_windows
                  wrpr                   %g0, RTRAP_PSTATE, %pstate
-                wrpr                    %g0, RTRAP_PSTATE_IRQOFF, %pstate
-                /* Redo sched+sig checks */
-                ldx                     [%g6 + TI_FLAGS], %l0
-                andcc                   %l0, _TIF_NEED_RESCHED, %g0
-
-                be,pt                   %xcc, 1f
-                 nop
-                call                    schedule
-                 wrpr                   %g0, RTRAP_PSTATE, %pstate
-                wrpr                    %g0, RTRAP_PSTATE_IRQOFF, %pstate
-                ldx                     [%g6 + TI_FLAGS], %l0
-
-1:              andcc                   %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
-                be,pt                   %xcc, __handle_user_windows_continue
-                 nop
-                mov                     %l5, %o1
-                add                     %sp, PTREGS_OFF, %o0
-                mov                     %l0, %o2
-
-                call                    do_notify_resume
-                 wrpr                   %g0, RTRAP_PSTATE, %pstate
-                wrpr                    %g0, RTRAP_PSTATE_IRQOFF, %pstate
-                /* Signal delivery can modify pt_regs tstate, so we must
-                 * reload it.
-                 */
-                ldx                     [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
-                sethi                   %hi(0xf << 20), %l4
-                and                     %l1, %l4, %l4
-                ba,pt                   %xcc, __handle_user_windows_continue
+                ba,pt                   %xcc, __handle_preemption_continue
+                 wrpr                   %g0, RTRAP_PSTATE_IRQOFF, %pstate
 
-                 andn                   %l1, %l4, %l1
 __handle_userfpu:
                 rd                      %fprs, %l5
                 andcc                   %l5, FPRS_FEF, %g0
@@ -87,7 +59,7 @@ __handle_signal:
                 ldx                     [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
                 sethi                   %hi(0xf << 20), %l4
                 and                     %l1, %l4, %l4
-                ba,pt                   %xcc, __handle_signal_continue
+                ba,pt                   %xcc, __handle_preemption_continue
                  andn                   %l1, %l4, %l1
 
                 /* When returning from a NMI (%pil==15) interrupt we want to
@@ -177,11 +149,9 @@ __handle_preemption_continue:
                 bne,pn                  %xcc, __handle_preemption
                  andcc                  %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
                 bne,pn                  %xcc, __handle_signal
-__handle_signal_continue:
                  ldub                   [%g6 + TI_WSAVED], %o2
                 brnz,pn                 %o2, __handle_user_windows
                  nop
-__handle_user_windows_continue:
                 sethi                   %hi(TSTATE_PEF), %o0
                 andcc                   %l1, %o0, %g0