Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

[linux-2.6-omap-h63xx.git] / arch / s390 / kernel / entry.S

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 6766e37fe8ea01955da640895bd2068358f660d6..708cf9cf9a355e175d5b1cf4fbdc2b96732e7084 100644 (file)
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -49,9 +49,9 @@ SP_ILC             =  STACK_FRAME_OVERHEAD + __PT_ILC
 SP_TRAP      = STACK_FRAME_OVERHEAD + __PT_TRAP
 SP_SIZE      = STACK_FRAME_OVERHEAD + __PT_SIZE
 
-_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
+_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
                 _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
-_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
+_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
                 _TIF_MCCK_PENDING)
 
 STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
@@ -279,8 +279,6 @@ sysc_do_restart:
        st      %r2,SP_R2(%r15)   # store return value (change R2 on stack)
 
 sysc_return:
-       tm      SP_PSW+1(%r15),0x01     # returning to user ?
-       bno     BASED(sysc_restore)
        tm      __TI_flags+3(%r9),_TIF_WORK_SVC
        bnz     BASED(sysc_work)  # there is work to do (signals etc.)
 sysc_restore:
@@ -312,11 +310,13 @@ sysc_work_loop:
 # One of the work bits is on. Find out which one.
 #
 sysc_work:
+       tm      SP_PSW+1(%r15),0x01     # returning to user ?
+       bno     BASED(sysc_restore)
        tm      __TI_flags+3(%r9),_TIF_MCCK_PENDING
        bo      BASED(sysc_mcck_pending)
        tm      __TI_flags+3(%r9),_TIF_NEED_RESCHED
        bo      BASED(sysc_reschedule)
-       tm      __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
+       tm      __TI_flags+3(%r9),_TIF_SIGPENDING
        bnz     BASED(sysc_sigpending)
        tm      __TI_flags+3(%r9),_TIF_RESTART_SVC
        bo      BASED(sysc_restart)
@@ -342,7 +342,7 @@ sysc_mcck_pending:
        br      %r1                     # TIF bit will be cleared by handler
 
 #
-# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
+# _TIF_SIGPENDING is set, call do_signal
 #
 sysc_sigpending:
        ni      __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
@@ -602,12 +602,6 @@ io_no_vtime:
        la      %r2,SP_PTREGS(%r15)     # address of register-save area
        basr    %r14,%r1                # branch to standard irq handler
 io_return:
-       tm      SP_PSW+1(%r15),0x01     # returning to user ?
-#ifdef CONFIG_PREEMPT
-       bno     BASED(io_preempt)       # no -> check for preemptive scheduling
-#else
-       bno     BASED(io_restore)       # no-> skip resched & signal
-#endif
        tm      __TI_flags+3(%r9),_TIF_WORK_INT
        bnz     BASED(io_work)          # there is work to do (signals etc.)
 io_restore:
@@ -629,10 +623,18 @@ io_restore_trace_psw:
        .long   0, io_restore_trace + 0x80000000
 #endif
 
-#ifdef CONFIG_PREEMPT
-io_preempt:
+#
+# switch to kernel stack, then check the TIF bits
+#
+io_work:
+       tm      SP_PSW+1(%r15),0x01     # returning to user ?
+#ifndef CONFIG_PREEMPT
+       bno     BASED(io_restore)       # no-> skip resched & signal
+#else
+       bnz     BASED(io_work_user)     # no -> check for preemptive scheduling
+       # check for preemptive scheduling
        icm     %r0,15,__TI_precount(%r9)
-       bnz     BASED(io_restore)
+       bnz     BASED(io_restore)       # preemption disabled
        l       %r1,SP_R15(%r15)
        s       %r1,BASED(.Lc_spsize)
        mvc     SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
@@ -646,10 +648,7 @@ io_resume_loop:
        br      %r1                     # call schedule
 #endif
 
-#
-# switch to kernel stack, then check the TIF bits
-#
-io_work:
+io_work_user:
        l       %r1,__LC_KERNEL_STACK
        s       %r1,BASED(.Lc_spsize)
        mvc     SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
@@ -657,7 +656,7 @@ io_work:
        lr      %r15,%r1
 #
 # One of the work bits is on. Find out which one.
-# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGMASK, _TIF_NEED_RESCHED
+# Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED
 #              and _TIF_MCCK_PENDING
 #
 io_work_loop:
@@ -665,7 +664,7 @@ io_work_loop:
        bo      BASED(io_mcck_pending)
        tm      __TI_flags+3(%r9),_TIF_NEED_RESCHED
        bo      BASED(io_reschedule)
-       tm      __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
+       tm      __TI_flags+3(%r9),_TIF_SIGPENDING
        bnz     BASED(io_sigpending)
        b       BASED(io_restore)
 io_work_done:
@@ -693,7 +692,7 @@ io_reschedule:
        b       BASED(io_work_loop)
 
 #
-# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
+# _TIF_SIGPENDING is set, call do_signal
 #
 io_sigpending:
        TRACE_IRQS_ON