James Bottomley 63ce590e41 PARISC: fix panic on prefetch(NULL) on PA7300LC ...

commit b3cb867481 upstream.

Due to an errata, the PA7300LC generates a TLB miss interruption even on the
prefetch instruction.  This means that prefetch(NULL), which is supposed to be
a nop on linux actually generates a NULL deref fault.  Fix this by testing the
address of prefetch against NULL before doing the prefetch.

Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2012-06-01 15:12:53 +08:00

..

asm

PARISC: fix panic on prefetch(NULL) on PA7300LC

2012-06-01 15:12:53 +08:00