4 files changed, 181 insertions, 58 deletions

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 1a271b16cb5c..cbe7d6a2d02c 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -138,14 +138,14 @@ STACK_SIZE  = 1 << STACK_SHIFT
         st      %r12,__SF_BACKCHAIN(%r15)       # clear back chain
         .endm
 
-        .macro  RESTORE_ALL sync
-        mvc     __LC_RETURN_PSW(8),SP_PSW(%r15) # move user PSW to lowcore
+        .macro  RESTORE_ALL psworg,sync
+        mvc     \psworg(8),SP_PSW(%r15) # move user PSW to lowcore
         .if !\sync
-        ni      __LC_RETURN_PSW+1,0xfd  # clear wait state bit
+        ni      \psworg+1,0xfd          # clear wait state bit
         .endif
         lm      %r0,%r15,SP_R0(%r15)    # load gprs 0-15 of user
         STORE_TIMER __LC_EXIT_TIMER
-        lpsw    __LC_RETURN_PSW         # back to caller
+        lpsw    \psworg                 # back to caller
         .endm
 
 /*
@@ -235,7 +235,7 @@ sysc_return:
         tm      __TI_flags+3(%r9),_TIF_WORK_SVC
         bnz     BASED(sysc_work)  # there is work to do (signals etc.)
 sysc_leave:
-        RESTORE_ALL 1
+        RESTORE_ALL __LC_RETURN_PSW,1
 
 #
 # recheck if there is more work to do
@@ -312,8 +312,6 @@ sysc_singlestep:
         la      %r14,BASED(sysc_return) # load adr. of system return
         br      %r1                     # branch to do_single_step
 
-__critical_end:
-
 #
 # call trace before and after sys_call
 #
@@ -571,7 +569,8 @@ io_return:
         tm      __TI_flags+3(%r9),_TIF_WORK_INT
         bnz     BASED(io_work)         # there is work to do (signals etc.)
 io_leave:
-        RESTORE_ALL 0
+        RESTORE_ALL __LC_RETURN_PSW,0
+io_done:
 
 #ifdef CONFIG_PREEMPT
 io_preempt:
@@ -621,7 +620,7 @@ io_work_loop:
 #
 io_mcck_pending:
         l       %r1,BASED(.Ls390_handle_mcck)
-        l       %r14,BASED(io_work_loop)
+        la      %r14,BASED(io_work_loop)
         br      %r1                    # TIF bit will be cleared by handler
 
 #
@@ -674,6 +673,8 @@ ext_no_vtime:
         basr    %r14,%r1
         b       BASED(io_return)
 
+__critical_end:
+
 /*
  * Machine check handler routines
  */
@@ -681,6 +682,7 @@ ext_no_vtime:
         .globl mcck_int_handler
 mcck_int_handler:
         spt     __LC_CPU_TIMER_SAVE_AREA        # revalidate cpu timer
+        mvc     __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA
         lm      %r0,%r15,__LC_GPREGS_SAVE_AREA  # revalidate gprs
         SAVE_ALL_BASE __LC_SAVE_AREA+32
         la      %r12,__LC_MCK_OLD_PSW
@@ -693,17 +695,8 @@ mcck_int_handler:
         mvc     __LC_ASYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER
         mvc     __LC_SYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER
         mvc     __LC_EXIT_TIMER(8),__LC_LAST_UPDATE_TIMER
-0:      tm      __LC_MCCK_CODE+2,0x08   # mwp of old psw valid?
-        bno     BASED(mcck_no_vtime)    # no -> skip cleanup critical
-        tm      __LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?
-        bz      BASED(mcck_no_vtime)
-        UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
-        UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
-        mvc     __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
-mcck_no_vtime:
 #endif
-0:
-        tm      __LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?
+0:      tm      __LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?
         bno     BASED(mcck_int_main)    # no -> skip cleanup critical
         tm      __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
         bnz     BASED(mcck_int_main)    # from user -> load async stack
@@ -720,6 +713,16 @@ mcck_int_main:
         be      BASED(0f)
         l       %r15,__LC_PANIC_STACK   # load panic stack
 0:      CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+        tm      __LC_MCCK_CODE+2,0x08   # mwp of old psw valid?
+        bno     BASED(mcck_no_vtime)    # no -> skip cleanup critical
+        tm      __LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?
+        bz      BASED(mcck_no_vtime)
+        UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
+        UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
+        mvc     __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
+mcck_no_vtime:
+#endif
         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
         la      %r2,SP_PTREGS(%r15)     # load pt_regs
         l       %r1,BASED(.Ls390_mcck)
@@ -737,7 +740,7 @@ mcck_int_main:
         l       %r1,BASED(.Ls390_handle_mcck)
         basr    %r14,%r1                # call machine check handler
 mcck_return:
-        RESTORE_ALL 0
+        RESTORE_ALL __LC_RETURN_MCCK_PSW,0
 
 #ifdef CONFIG_SMP
 /*
@@ -803,6 +806,10 @@ cleanup_table_sysc_leave:
         .long   sysc_leave + 0x80000000, sysc_work_loop + 0x80000000
 cleanup_table_sysc_work_loop:
         .long   sysc_work_loop + 0x80000000, sysc_reschedule + 0x80000000
+cleanup_table_io_leave:
+        .long   io_leave + 0x80000000, io_done + 0x80000000
+cleanup_table_io_work_loop:
+        .long   io_work_loop + 0x80000000, io_mcck_pending + 0x80000000
 
 cleanup_critical:
         clc     4(4,%r12),BASED(cleanup_table_system_call)
@@ -825,10 +832,26 @@ cleanup_critical:
         clc     4(4,%r12),BASED(cleanup_table_sysc_work_loop+4)
         bl      BASED(cleanup_sysc_return)
 0:
+        clc     4(4,%r12),BASED(cleanup_table_io_leave)
+        bl      BASED(0f)
+        clc     4(4,%r12),BASED(cleanup_table_io_leave+4)
+        bl      BASED(cleanup_io_leave)
+0:
+        clc     4(4,%r12),BASED(cleanup_table_io_work_loop)
+        bl      BASED(0f)
+        clc     4(4,%r12),BASED(cleanup_table_io_work_loop+4)
+        bl      BASED(cleanup_io_return)
+0:
         br      %r14
 
 cleanup_system_call:
         mvc     __LC_RETURN_PSW(8),0(%r12)
+        c       %r12,BASED(.Lmck_old_psw)
+        be      BASED(0f)
+        la      %r12,__LC_SAVE_AREA+16
+        b       BASED(1f)
+0:      la      %r12,__LC_SAVE_AREA+32
+1:
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
         clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)
         bh      BASED(0f)
@@ -838,11 +861,13 @@ cleanup_system_call:
 #endif
         clc     __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)
         bh      BASED(0f)
-        mvc     __LC_SAVE_AREA(16),__LC_SAVE_AREA+16
-0:      st      %r13,__LC_SAVE_AREA+20
+        mvc     __LC_SAVE_AREA(16),0(%r12)
+0:      st      %r13,4(%r12)
+        st      %r12,__LC_SAVE_AREA+48  # argh
         SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
         CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
-        st      %r15,__LC_SAVE_AREA+28
+        l       %r12,__LC_SAVE_AREA+48  # argh
+        st      %r15,12(%r12)
         lh      %r7,0x8a
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 cleanup_vtime:
@@ -879,17 +904,21 @@ cleanup_sysc_return:
 
 cleanup_sysc_leave:
         clc     4(4,%r12),BASED(cleanup_sysc_leave_insn)
-        be      BASED(0f)
+        be      BASED(2f)
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
         mvc     __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
         clc     4(4,%r12),BASED(cleanup_sysc_leave_insn+4)
-        be      BASED(0f)
+        be      BASED(2f)
 #endif
         mvc     __LC_RETURN_PSW(8),SP_PSW(%r15)
-        mvc     __LC_SAVE_AREA+16(16),SP_R12(%r15)
-        lm      %r0,%r11,SP_R0(%r15)
+        c       %r12,BASED(.Lmck_old_psw)
+        bne     BASED(0f)
+        mvc     __LC_SAVE_AREA+32(16),SP_R12(%r15)
+        b       BASED(1f)
+0:      mvc     __LC_SAVE_AREA+16(16),SP_R12(%r15)
+1:      lm      %r0,%r11,SP_R0(%r15)
         l       %r15,SP_R15(%r15)
-0:      la      %r12,__LC_RETURN_PSW
+2:      la      %r12,__LC_RETURN_PSW
         br      %r14
 cleanup_sysc_leave_insn:
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
@@ -897,6 +926,36 @@ cleanup_sysc_leave_insn:
 #endif
         .long   sysc_leave + 10 + 0x80000000
 
+cleanup_io_return:
+        mvc     __LC_RETURN_PSW(4),0(%r12)
+        mvc     __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop)
+        la      %r12,__LC_RETURN_PSW
+        br      %r14
+
+cleanup_io_leave:
+        clc     4(4,%r12),BASED(cleanup_io_leave_insn)
+        be      BASED(2f)
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+        mvc     __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
+        clc     4(4,%r12),BASED(cleanup_io_leave_insn+4)
+        be      BASED(2f)
+#endif
+        mvc     __LC_RETURN_PSW(8),SP_PSW(%r15)
+        c       %r12,BASED(.Lmck_old_psw)
+        bne     BASED(0f)
+        mvc     __LC_SAVE_AREA+32(16),SP_R12(%r15)
+        b       BASED(1f)
+0:      mvc     __LC_SAVE_AREA+16(16),SP_R12(%r15)
+1:      lm      %r0,%r11,SP_R0(%r15)
+        l       %r15,SP_R15(%r15)
+2:      la      %r12,__LC_RETURN_PSW
+        br      %r14
+cleanup_io_leave_insn:
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+        .long   io_leave + 18 + 0x80000000
+#endif
+        .long   io_leave + 14 + 0x80000000
+
 /*
  * Integer constants
  */
@@ -918,6 +977,7 @@ cleanup_sysc_leave_insn:
 .Ls390_mcck:   .long  s390_do_machine_check
 .Ls390_handle_mcck:
                .long  s390_handle_mcck
+.Lmck_old_psw: .long  __LC_MCK_OLD_PSW
 .Ldo_IRQ:      .long  do_IRQ
 .Ldo_extint:   .long  do_extint
 .Ldo_signal:   .long  do_signal
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index d9f22915008c..5db5976ff594 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -131,14 +131,14 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
         stg     %r12,__SF_BACKCHAIN(%r15)
         .endm
 
-        .macro  RESTORE_ALL sync
-        mvc     __LC_RETURN_PSW(16),SP_PSW(%r15) # move user PSW to lowcore
+        .macro  RESTORE_ALL psworg,sync
+        mvc     \psworg(16),SP_PSW(%r15) # move user PSW to lowcore
         .if !\sync
-        ni      __LC_RETURN_PSW+1,0xfd  # clear wait state bit
+        ni      \psworg+1,0xfd          # clear wait state bit
         .endif
         lmg     %r0,%r15,SP_R0(%r15)    # load gprs 0-15 of user
         STORE_TIMER __LC_EXIT_TIMER
-        lpswe   __LC_RETURN_PSW         # back to caller
+        lpswe   \psworg                 # back to caller
         .endm
 
 /*
@@ -233,7 +233,7 @@ sysc_return:
         tm      __TI_flags+7(%r9),_TIF_WORK_SVC
         jnz     sysc_work         # there is work to do (signals etc.)
 sysc_leave:
-        RESTORE_ALL 1
+        RESTORE_ALL __LC_RETURN_PSW,1
 
 #
 # recheck if there is more work to do
@@ -308,8 +308,6 @@ sysc_singlestep:
         jg      do_single_step          # branch to do_sigtrap
 
 
-__critical_end:
-
 #
 # call syscall_trace before and after system call
 # special linkage: %r12 contains the return address for trace_svc
@@ -612,7 +610,8 @@ io_return:
         tm      __TI_flags+7(%r9),_TIF_WORK_INT
         jnz     io_work                # there is work to do (signals etc.)
 io_leave:
-        RESTORE_ALL 0
+        RESTORE_ALL __LC_RETURN_PSW,0
+io_done:
 
 #ifdef CONFIG_PREEMPT
 io_preempt:
@@ -711,6 +710,8 @@ ext_no_vtime:
         brasl   %r14,do_extint
         j       io_return
 
+__critical_end:
+
 /*
  * Machine check handler routines
  */
@@ -718,6 +719,7 @@ ext_no_vtime:
 mcck_int_handler:
         la      %r1,4095                # revalidate r1
         spt     __LC_CPU_TIMER_SAVE_AREA-4095(%r1)      # revalidate cpu timer
+        mvc     __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r1)
         lmg     %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
         SAVE_ALL_BASE __LC_SAVE_AREA+64
         la      %r12,__LC_MCK_OLD_PSW
@@ -730,17 +732,8 @@ mcck_int_handler:
         mvc     __LC_ASYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER
         mvc     __LC_SYNC_ENTER_TIMER(8),__LC_LAST_UPDATE_TIMER
         mvc     __LC_EXIT_TIMER(8),__LC_LAST_UPDATE_TIMER
-0:      tm      __LC_MCCK_CODE+2,0x08   # mwp of old psw valid?
-        jno     mcck_no_vtime           # no -> no timer update
-        tm      __LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?
-        jz      mcck_no_vtime
-        UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
-        UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
-        mvc     __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
-mcck_no_vtime:
 #endif
-0:
-        tm      __LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?
+0:      tm      __LC_MCCK_CODE+2,0x09   # mwp + ia of old psw valid?
         jno     mcck_int_main           # no -> skip cleanup critical
         tm      __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
         jnz     mcck_int_main           # from user -> load kernel stack
@@ -756,6 +749,16 @@ mcck_int_main:
         jz      0f
         lg      %r15,__LC_PANIC_STACK   # load panic stack
 0:      CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+        tm      __LC_MCCK_CODE+2,0x08   # mwp of old psw valid?
+        jno     mcck_no_vtime           # no -> no timer update
+        tm      __LC_MCK_OLD_PSW+1,0x01 # interrupting from user ?
+        jz      mcck_no_vtime
+        UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
+        UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
+        mvc     __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
+mcck_no_vtime:
+#endif
         lg      %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
         la      %r2,SP_PTREGS(%r15)     # load pt_regs
         brasl   %r14,s390_do_machine_check
@@ -771,7 +774,7 @@ mcck_int_main:
         jno     mcck_return
         brasl   %r14,s390_handle_mcck
 mcck_return:
-        RESTORE_ALL 0
+        RESTORE_ALL __LC_RETURN_MCCK_PSW,0
 
 #ifdef CONFIG_SMP
 /*
@@ -833,6 +836,10 @@ cleanup_table_sysc_leave:
         .quad   sysc_leave, sysc_work_loop
 cleanup_table_sysc_work_loop:
         .quad   sysc_work_loop, sysc_reschedule
+cleanup_table_io_leave:
+        .quad   io_leave, io_done
+cleanup_table_io_work_loop:
+        .quad   io_work_loop, io_mcck_pending
 
 cleanup_critical:
         clc     8(8,%r12),BASED(cleanup_table_system_call)
@@ -855,10 +862,26 @@ cleanup_critical:
         clc     8(8,%r12),BASED(cleanup_table_sysc_work_loop+8)
         jl      cleanup_sysc_return
 0:
+        clc     8(8,%r12),BASED(cleanup_table_io_leave)
+        jl      0f
+        clc     8(8,%r12),BASED(cleanup_table_io_leave+8)
+        jl      cleanup_io_leave
+0:
+        clc     8(8,%r12),BASED(cleanup_table_io_work_loop)
+        jl      0f
+        clc     8(8,%r12),BASED(cleanup_table_io_work_loop+8)
+        jl      cleanup_io_return
+0:
         br      %r14
 
 cleanup_system_call:
         mvc     __LC_RETURN_PSW(16),0(%r12)
+        cghi    %r12,__LC_MCK_OLD_PSW
+        je      0f
+        la      %r12,__LC_SAVE_AREA+32
+        j       1f
+0:      la      %r12,__LC_SAVE_AREA+64
+1:
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
         clc     __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8)
         jh      0f
@@ -868,11 +891,13 @@ cleanup_system_call:
 #endif
         clc     __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn)
         jh      0f
-        mvc     __LC_SAVE_AREA(32),__LC_SAVE_AREA+32
-0:      stg     %r13,__LC_SAVE_AREA+40
+        mvc     __LC_SAVE_AREA(32),0(%r12)
+0:      stg     %r13,8(%r12)
+        stg     %r12,__LC_SAVE_AREA+96  # argh
         SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
         CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
-        stg     %r15,__LC_SAVE_AREA+56
+        lg      %r12,__LC_SAVE_AREA+96  # argh
+        stg     %r15,24(%r12)
         llgh    %r7,__LC_SVC_INT_CODE
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 cleanup_vtime:
@@ -909,17 +934,21 @@ cleanup_sysc_return:
 
 cleanup_sysc_leave:
         clc     8(8,%r12),BASED(cleanup_sysc_leave_insn)
-        je      0f
+        je      2f
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
         mvc     __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
         clc     8(8,%r12),BASED(cleanup_sysc_leave_insn+8)
-        je      0f
+        je      2f
 #endif
         mvc     __LC_RETURN_PSW(16),SP_PSW(%r15)
-        mvc     __LC_SAVE_AREA+32(32),SP_R12(%r15)
-        lmg     %r0,%r11,SP_R0(%r15)
+        cghi    %r12,__LC_MCK_OLD_PSW
+        jne     0f
+        mvc     __LC_SAVE_AREA+64(32),SP_R12(%r15)
+        j       1f
+0:      mvc     __LC_SAVE_AREA+32(32),SP_R12(%r15)
+1:      lmg     %r0,%r11,SP_R0(%r15)
         lg      %r15,SP_R15(%r15)
-0:      la      %r12,__LC_RETURN_PSW
+2:      la      %r12,__LC_RETURN_PSW
         br      %r14
 cleanup_sysc_leave_insn:
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
@@ -927,6 +956,36 @@ cleanup_sysc_leave_insn:
 #endif
         .quad   sysc_leave + 12
 
+cleanup_io_return:
+        mvc     __LC_RETURN_PSW(8),0(%r12)
+        mvc     __LC_RETURN_PSW+8(8),BASED(cleanup_table_io_work_loop)
+        la      %r12,__LC_RETURN_PSW
+        br      %r14
+
+cleanup_io_leave:
+        clc     8(8,%r12),BASED(cleanup_io_leave_insn)
+        je      2f
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+        mvc     __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
+        clc     8(8,%r12),BASED(cleanup_io_leave_insn+8)
+        je      2f
+#endif
+        mvc     __LC_RETURN_PSW(16),SP_PSW(%r15)
+        cghi    %r12,__LC_MCK_OLD_PSW
+        jne     0f
+        mvc     __LC_SAVE_AREA+64(32),SP_R12(%r15)
+        j       1f
+0:      mvc     __LC_SAVE_AREA+32(32),SP_R12(%r15)
+1:      lmg     %r0,%r11,SP_R0(%r15)
+        lg      %r15,SP_R15(%r15)
+2:      la      %r12,__LC_RETURN_PSW
+        br      %r14
+cleanup_io_leave_insn:
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+        .quad   io_leave + 20
+#endif
+        .quad   io_leave + 16
+
 /*
  * Integer constants
  */
diff --git a/drivers/s390/s390mach.c b/drivers/s390/s390mach.c
index 5bb255e02acc..4191fd9d4d11 100644
--- a/drivers/s390/s390mach.c
+++ b/drivers/s390/s390mach.c
@@ -240,7 +240,7 @@ s390_revalidate_registers(struct mci *mci)
                          * Floating point control register can't be restored.
                          * Task will be terminated.
                          */
-                        asm volatile ("lfpc 0(%0)" : : "a" (&zero));
+                        asm volatile ("lfpc 0(%0)" : : "a" (&zero), "m" (zero));
                         kill_task = 1;
 
                 }
diff --git a/include/asm-s390/lowcore.h b/include/asm-s390/lowcore.h
index afe6a9f9b0ae..c6f51c9ce3ff 100644
--- a/include/asm-s390/lowcore.h
+++ b/include/asm-s390/lowcore.h
@@ -68,6 +68,7 @@
 #define __LC_SYSTEM_TIMER               0x270
 #define __LC_LAST_UPDATE_CLOCK          0x278
 #define __LC_STEAL_CLOCK                0x280
+#define __LC_RETURN_MCCK_PSW            0x288
 #define __LC_KERNEL_STACK               0xC40
 #define __LC_THREAD_INFO                0xC44
 #define __LC_ASYNC_STACK                0xC48
@@ -90,6 +91,7 @@
 #define __LC_SYSTEM_TIMER               0x278
 #define __LC_LAST_UPDATE_CLOCK          0x280
 #define __LC_STEAL_CLOCK                0x288
+#define __LC_RETURN_MCCK_PSW            0x290
 #define __LC_KERNEL_STACK               0xD40
 #define __LC_THREAD_INFO                0xD48
 #define __LC_ASYNC_STACK                0xD50
@@ -196,7 +198,8 @@ struct _lowcore
         __u64        system_timer;             /* 0x270 */
         __u64        last_update_clock;        /* 0x278 */
         __u64        steal_clock;              /* 0x280 */
-        __u8         pad8[0xc00-0x288];        /* 0x288 */
+        psw_t        return_mcck_psw;          /* 0x288 */
+        __u8         pad8[0xc00-0x290];        /* 0x290 */
 
         /* System info area */
         __u32        save_area[16];            /* 0xc00 */
@@ -285,7 +288,8 @@ struct _lowcore
         __u64        system_timer;             /* 0x278 */
         __u64        last_update_clock;        /* 0x280 */
         __u64        steal_clock;              /* 0x288 */
-        __u8         pad8[0xc00-0x290];        /* 0x290 */
+        psw_t        return_mcck_psw;          /* 0x290 */
+        __u8         pad8[0xc00-0x2a0];        /* 0x2a0 */
         /* System info area */
         __u64        save_area[16];            /* 0xc00 */
         __u8         pad9[0xd40-0xc80];        /* 0xc80 */