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s390: initialize backchain for ext_int_handler()

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To allow correct stack backtraces the backchain for the external
interrupt handler is now initialized with zero like it is already
done for example by io_int_handler().

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu 2012-05-09 16:27:35 +02:00 committed by Martin Schwidefsky
parent 54310a2d9e
commit 0de9db37f0
1 changed files with 1 additions and 0 deletions
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arch/s390/kernel/entry64.S
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@ -622,6 +622,7 @@ ext_skip:
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
stmg %r8,%r9,__PT_PSW(%r11)
TRACE_IRQS_OFF
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
lghi %r1,4096
lgr %r2,%r11 # pass pointer to pt_regs
llgf %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code