s390/signal: always restore saved runtime instrumentation psw bit

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Commit "s390: fix handling of runtime instrumentation psw bit" (5ebf250dab)
changed the behavior of setting the runtime instrumentation psw bit.  This
commit restores the original logic:

1. When returning from the signal handler, the runtime instrumentation psw bit
   is restored to its saved state.
2. If the runtime instrumentation psw bit is enabled during the signal handler,
   it is always turned off when leaving the signal handler.  The saved state
   is restored as described in 1.  That also implies that turning on runtime
   instrumentation in the signal handler is only effective while running in the
   signal context.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>

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This commit is contained in:

Hendrik Brueckner 2013-11-19 12:26:09 +01:00 • committed by Martin Schwidefsky

parent b4789b8e6b

commit aa7e04b380

2 changed files with 2 additions and 2 deletions

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arch/s390/kernel/compat_signal.c

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2

arch/s390/kernel/signal.c

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