aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/kernel/entry64.S
diff options
context:
space:
mode:
authorHeiko Carstens <heiko.carstens@de.ibm.com>2010-07-27 19:29:37 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-07-27 19:29:42 +0200
commitf5cdac274c62ab61874374abb60f2310ab979295 (patch)
tree9d0c444bc91f6b84d4e15552ebdea7aaf95510c2 /arch/s390/kernel/entry64.S
parent1a041a23da7c77b53c71fe11b4f940388bee37b1 (diff)
[S390] Fix IRQ tracing in case of PER
In case user space is single stepped (PER) the program check handler claims too early that IRQs are enabled on the return path. Subsequent checks will notice that the IRQ mask in the PSW and what lockdep thinks the IRQ mask should be do not correlate and therefore will print a warning to the console and disable lockdep. Fix this by doing all the work within the correct context. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/entry64.S')
-rw-r--r--arch/s390/kernel/entry64.S12
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index e7192e1cb67..8bccec15ea9 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -544,8 +544,16 @@ pgm_no_vtime2:
lgf %r3,__LC_PGM_ILC # load program interruption code
lghi %r8,0x7f
ngr %r8,%r3 # clear per-event-bit and ilc
- je pgm_exit
- j pgm_do_call
+ je pgm_exit2
+ sll %r8,3
+ larl %r1,pgm_check_table
+ lg %r1,0(%r8,%r1) # load address of handler routine
+ la %r2,SP_PTREGS(%r15) # address of register-save area
+ basr %r14,%r1 # branch to interrupt-handler
+pgm_exit2:
+ TRACE_IRQS_ON
+ stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
+ j sysc_return
#
# it was a single stepped SVC that is causing all the trouble