1 files changed, 73 insertions, 41 deletions

diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 05e26d1fdf40..a3e47b893f07 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -67,12 +67,28 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
          brasl  %r14,trace_hardirqs_off
         .endm
 
-        .macro  LOCKDEP_SYS_EXIT
-         brasl  %r14,lockdep_sys_exit
+        .macro TRACE_IRQS_CHECK
+        tm      SP_PSW(%r15),0x03       # irqs enabled?
+        jz      0f
+        brasl   %r14,trace_hardirqs_on
+        j       1f
+0:      brasl   %r14,trace_hardirqs_off
+1:
         .endm
 #else
 #define TRACE_IRQS_ON
 #define TRACE_IRQS_OFF
+#define TRACE_IRQS_CHECK
+#endif
+
+#ifdef CONFIG_LOCKDEP
+        .macro  LOCKDEP_SYS_EXIT
+        tm      SP_PSW+1(%r15),0x01     # returning to user ?
+        jz      0f
+        brasl   %r14,lockdep_sys_exit
+0:
+        .endm
+#else
 #define LOCKDEP_SYS_EXIT
 #endif
 
@@ -222,8 +238,6 @@ sysc_saveall:
         llgh    %r7,__LC_SVC_INT_CODE   # get svc number from lowcore
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 sysc_vtime:
-        tm      SP_PSW+1(%r15),0x01     # interrupting from user ?
-        jz      sysc_do_svc
         UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
 sysc_stime:
         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
@@ -257,19 +271,34 @@ sysc_noemu:
 
 sysc_return:
         tm      SP_PSW+1(%r15),0x01     # returning to user ?
-        jno     sysc_leave
+        jno     sysc_restore
         tm      __TI_flags+7(%r9),_TIF_WORK_SVC
         jnz     sysc_work       # there is work to do (signals etc.)
+sysc_restore:
+#ifdef CONFIG_TRACE_IRQFLAGS
+        larl    %r1,sysc_restore_trace_psw
+        lpswe   0(%r1)
+sysc_restore_trace:
+        TRACE_IRQS_CHECK
         LOCKDEP_SYS_EXIT
+#endif
 sysc_leave:
         RESTORE_ALL __LC_RETURN_PSW,1
+sysc_done:
+
+#ifdef CONFIG_TRACE_IRQFLAGS
+        .align  8
+        .globl sysc_restore_trace_psw
+sysc_restore_trace_psw:
+        .quad   0, sysc_restore_trace
+#endif
 
 #
 # recheck if there is more work to do
 #
 sysc_work_loop:
         tm      __TI_flags+7(%r9),_TIF_WORK_SVC
-        jz      sysc_leave        # there is no work to do
+        jz      sysc_restore      # there is no work to do
 #
 # One of the work bits is on. Find out which one.
 #
@@ -284,8 +313,8 @@ sysc_work:
         jo      sysc_restart
         tm      __TI_flags+7(%r9),_TIF_SINGLE_STEP
         jo      sysc_singlestep
-        LOCKDEP_SYS_EXIT
-        j       sysc_leave
+        j       sysc_restore
+sysc_work_done:
 
 #
 # _TIF_NEED_RESCHED is set, call schedule
@@ -445,6 +474,7 @@ pgm_check_handler:
 pgm_no_vtime:
 #endif
         lg      %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
+        TRACE_IRQS_OFF
         lgf     %r3,__LC_PGM_ILC        # load program interruption code
         lghi    %r8,0x7f
         ngr     %r8,%r3
@@ -484,6 +514,7 @@ pgm_per_std:
 pgm_no_vtime2:
 #endif
         lg      %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
+        TRACE_IRQS_OFF
         lg      %r1,__TI_task(%r9)
         tm      SP_PSW+1(%r15),0x01     # kernel per event ?
         jz      kernel_per
@@ -504,12 +535,9 @@ pgm_svcper:
         SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
         CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
-        tm      SP_PSW+1(%r15),0x01     # interrupting from user ?
-        jz      pgm_no_vtime3
         UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
-pgm_no_vtime3:
 #endif
         llgh    %r7,__LC_SVC_INT_CODE   # get svc number from lowcore
         lg      %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
@@ -529,7 +557,7 @@ kernel_per:
         lhi     %r0,__LC_PGM_OLD_PSW
         sth     %r0,SP_TRAP(%r15)       # set trap indication to pgm check
         la      %r2,SP_PTREGS(%r15)     # address of register-save area
-        larl    %r14,sysc_leave         # load adr. of system ret, no work
+        larl    %r14,sysc_restore       # load adr. of system ret, no work
         jg      do_single_step          # branch to do_single_step
 
 /*
@@ -554,26 +582,38 @@ io_no_vtime:
         TRACE_IRQS_OFF
         la      %r2,SP_PTREGS(%r15)     # address of register-save area
         brasl   %r14,do_IRQ             # call standard irq handler
-        TRACE_IRQS_ON
-
 io_return:
         tm      SP_PSW+1(%r15),0x01     # returning to user ?
 #ifdef CONFIG_PREEMPT
         jno     io_preempt              # no -> check for preemptive scheduling
 #else
-        jno     io_leave                # no-> skip resched & signal
+        jno     io_restore              # no-> skip resched & signal
 #endif
         tm      __TI_flags+7(%r9),_TIF_WORK_INT
         jnz     io_work                 # there is work to do (signals etc.)
+io_restore:
+#ifdef CONFIG_TRACE_IRQFLAGS
+        larl    %r1,io_restore_trace_psw
+        lpswe   0(%r1)
+io_restore_trace:
+        TRACE_IRQS_CHECK
         LOCKDEP_SYS_EXIT
+#endif
 io_leave:
         RESTORE_ALL __LC_RETURN_PSW,0
 io_done:
 
+#ifdef CONFIG_TRACE_IRQFLAGS
+        .align  8
+        .globl io_restore_trace_psw
+io_restore_trace_psw:
+        .quad   0, io_restore_trace
+#endif
+
 #ifdef CONFIG_PREEMPT
 io_preempt:
         icm     %r0,15,__TI_precount(%r9)
-        jnz     io_leave
+        jnz     io_restore
         # switch to kernel stack
         lg      %r1,SP_R15(%r15)
         aghi    %r1,-SP_SIZE
@@ -582,14 +622,9 @@ io_preempt:
         lgr     %r15,%r1
 io_resume_loop:
         tm      __TI_flags+7(%r9),_TIF_NEED_RESCHED
-        jno     io_leave
-        larl    %r1,.Lc_pactive
-        mvc     __TI_precount(4,%r9),0(%r1)
-        stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
-        brasl   %r14,schedule           # call schedule
-        stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
-        xc      __TI_precount(4,%r9),__TI_precount(%r9)
-        j       io_resume_loop
+        jno     io_restore
+        larl    %r14,io_resume_loop
+        jg      preempt_schedule_irq
 #endif
 
 #
@@ -613,37 +648,39 @@ io_work_loop:
         jo      io_reschedule
         tm      __TI_flags+7(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
         jnz     io_sigpending
-        LOCKDEP_SYS_EXIT
-        j       io_leave
+        j       io_restore
+io_work_done:
 
 #
 # _TIF_MCCK_PENDING is set, call handler
 #
 io_mcck_pending:
-        TRACE_IRQS_OFF
         brasl   %r14,s390_handle_mcck   # TIF bit will be cleared by handler
-        TRACE_IRQS_ON
         j       io_work_loop
 
 #
 # _TIF_NEED_RESCHED is set, call schedule
 #
 io_reschedule:
+        TRACE_IRQS_ON
         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
         brasl   %r14,schedule           # call scheduler
         stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
+        TRACE_IRQS_OFF
         tm      __TI_flags+7(%r9),_TIF_WORK_INT
-        jz      io_leave                # there is no work to do
+        jz      io_restore              # there is no work to do
         j       io_work_loop
 
 #
 # _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
 #
 io_sigpending:
+        TRACE_IRQS_ON
         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
         la      %r2,SP_PTREGS(%r15)     # load pt_regs
         brasl   %r14,do_signal          # call do_signal
         stnsm   __SF_EMPTY(%r15),0xfc   # disable I/O and ext. interrupts
+        TRACE_IRQS_OFF
         j       io_work_loop
 
 /*
@@ -669,7 +706,6 @@ ext_no_vtime:
         la      %r2,SP_PTREGS(%r15)     # address of register-save area
         llgh    %r3,__LC_EXT_INT_CODE   # get interruption code
         brasl   %r14,do_extint
-        TRACE_IRQS_ON
         j       io_return
 
 __critical_end:
@@ -824,15 +860,15 @@ cleanup_table_system_call:
 cleanup_table_sysc_return:
         .quad   sysc_return, sysc_leave
 cleanup_table_sysc_leave:
-        .quad   sysc_leave, sysc_work_loop
+        .quad   sysc_leave, sysc_done
 cleanup_table_sysc_work_loop:
-        .quad   sysc_work_loop, sysc_reschedule
+        .quad   sysc_work_loop, sysc_work_done
 cleanup_table_io_return:
         .quad   io_return, io_leave
 cleanup_table_io_leave:
         .quad   io_leave, io_done
 cleanup_table_io_work_loop:
-        .quad   io_work_loop, io_mcck_pending
+        .quad   io_work_loop, io_work_done
 
 cleanup_critical:
         clc     8(8,%r12),BASED(cleanup_table_system_call)
@@ -901,8 +937,6 @@ cleanup_system_call:
 cleanup_vtime:
         clc     __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24)
         jhe     cleanup_stime
-        tm      SP_PSW+1(%r15),0x01     # interrupting from user ?
-        jz      cleanup_novtime
         UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
 cleanup_stime:
         clc     __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+32)
@@ -910,7 +944,6 @@ cleanup_stime:
         UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
 cleanup_update:
         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
-cleanup_novtime:
 #endif
         mvc     __LC_RETURN_PSW+8(8),BASED(cleanup_table_system_call+8)
         la      %r12,__LC_RETURN_PSW
@@ -949,10 +982,10 @@ cleanup_sysc_leave:
 2:      la      %r12,__LC_RETURN_PSW
         br      %r14
 cleanup_sysc_leave_insn:
+        .quad   sysc_done - 4
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
-        .quad   sysc_leave + 16
+        .quad   sysc_done - 8
 #endif
-        .quad   sysc_leave + 12
 
 cleanup_io_return:
         mvc     __LC_RETURN_PSW(8),0(%r12)
@@ -979,17 +1012,16 @@ cleanup_io_leave:
 2:      la      %r12,__LC_RETURN_PSW
         br      %r14
 cleanup_io_leave_insn:
+        .quad   io_done - 4
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
-        .quad   io_leave + 20
+        .quad   io_done - 8
 #endif
-        .quad   io_leave + 16
 
 /*
  * Integer constants
  */
                 .align  4
 .Lconst:
-.Lc_pactive:    .long   PREEMPT_ACTIVE
 .Lnr_syscalls:  .long   NR_syscalls
 .L0x0130:       .short  0x130
 .L0x0140:       .short  0x140