linux-stable.git/arch/parisc/include/asm/prefetch.h, branch linux-3.3.y Linux kernel stable tree PARISC: fix panic on prefetch(NULL) on PA7300LC 2012-06-01T07:15:40+00:00 James Bottomley JBottomley@Parallels.com 2012-05-16T10:10:27+00:00 4d4297f42d0de1f91f580cec857dbcc9ebcb12d0 commit b3cb8674811d1851bbf1486a73d62b90c119b994 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> 
commit b3cb8674811d1851bbf1486a73d62b90c119b994 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>
parisc: move include/asm-parisc to arch/parisc/include/asm 2008-10-10T16:32:29+00:00 Kyle McMartin kyle@mcmartin.ca 2008-07-29T03:02:13+00:00 deae26bf6a10e47983606f5df080b91e97650ead