[PATCH] lockdep: irqtrace subsystem, s390 support

irqtrace support for s390.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 1ca499fa54b..56f5f613b86 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -58,6 +58,19 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
 
 #define BASED(name) name-system_call(%r13)
 
+#ifdef CONFIG_TRACE_IRQFLAGS
+        .macro  TRACE_IRQS_ON
+         brasl  %r14,trace_hardirqs_on
+        .endm
+
+        .macro  TRACE_IRQS_OFF
+         brasl  %r14,trace_hardirqs_off
+        .endm
+#else
+#define TRACE_IRQS_ON
+#define TRACE_IRQS_OFF
+#endif
+
         .macro  STORE_TIMER lc_offset
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
         stpt    \lc_offset
@@ -354,6 +367,7 @@ ret_from_fork:
         jo      0f
         stg     %r15,SP_R15(%r15)       # store stack pointer for new kthread
 0:      brasl   %r14,schedule_tail
+        TRACE_IRQS_ON
         stosm   24(%r15),0x03     # reenable interrupts
         j       sysc_return
 
@@ -535,6 +549,7 @@ pgm_no_vtime3:
         mvc     __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
         mvc     __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
         oi      __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
+        TRACE_IRQS_ON
         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
         j       sysc_do_svc
 
@@ -557,8 +572,10 @@ io_int_handler:
 io_no_vtime:
 #endif
         lg      %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
+        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 ?
@@ -665,9 +682,11 @@ ext_int_handler:
 ext_no_vtime:
 #endif
         lg      %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
+        TRACE_IRQS_OFF
         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:
@@ -743,7 +762,9 @@ mcck_no_vtime:
         stosm   __SF_EMPTY(%r15),0x04   # turn dat on
         tm      __TI_flags+7(%r9),_TIF_MCCK_PENDING
         jno     mcck_return
+        TRACE_IRQS_OFF
         brasl   %r14,s390_handle_mcck
+        TRACE_IRQS_ON
 mcck_return:
         mvc     __LC_RETURN_MCCK_PSW(16),SP_PSW(%r15) # move return PSW
         ni      __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit