[S390] s390: clear high-order bits of registers after sam64

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When the kernel is IPLed without the CLEAR option and switches
to 64-bit, the high-order half of the registers might contain
random values.  This can cause addressing exceptions and the
kernel enters an interrupt loop.

Initialize the high-order half of the general purpose registers
with zeros after switching to 64-bit mode.

Cc: <stable@kernel.org>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Hendrik Brueckner 2009-12-07 12:44:42 +01:00 • committed by Martin Schwidefsky

parent 6ec22f9b03

commit cf87b7439e

1 changed files with 3 additions and 0 deletions

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arch/s390/kernel/head64.S

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