s390/entry: fix svc number for TIF_SYSCALL system call restart

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The load of the svc number in the TIF_SYSCALL restart path needs to be
done with an instruction that loads all 64 bits of %r1, 'lh' only loads
32 bits. If the upper half of %r1 is not zero and has the msb set,
entry64.S will try to execute an svc with a really large number.
What will be in the upper half of %r1 depends on the code generated by
gcc for the functions on the do_signal() callchain.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Martin Schwidefsky 2012-10-09 13:33:53 +02:00

parent fc7e48aad3

commit 450e47da67

1 changed files with 1 additions and 1 deletions

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arch/s390/kernel/entry64.S

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