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[S390] fix kprobes single stepping

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Fix kprobes after git commit 1e54622e04
broke it. The kprobe_handler is now called with interrupts in the state
at the time of the breakpoint. The single step of the replaced instruction
is done with interrupts off which makes it necessary to enable and disable
the interupts in the kprobes code.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2010-10-29 16:50:45 +02:00
committed by Martin Schwidefsky
parent f2166bb117
commit 9ec2708053
3 changed files with 10 additions and 1 deletions
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1
arch/s390/kernel/entry64.S
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@@ -568,6 +568,7 @@ pgm_svcper:
# per was called from kernel, must be kprobes
#
kernel_per:
REENABLE_IRQS
xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) # clear svc number
la %r2,SP_PTREGS(%r15) # address of register-save area
brasl %r14,do_single_step