linux-toradex.git/arch/parisc/include/asm/prefetch.h, branch v4.1.15 Linux kernel for Apalis and Colibri modules [PARISC] fix panic on prefetch(NULL) on PA7300LC 2012-05-16T12:15:21+00:00 James Bottomley JBottomley@Parallels.com 2012-05-16T10:10:27+00:00 b3cb8674811d1851bbf1486a73d62b90c119b994 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. Cc: stable@vger.kernel.org Signed-off-by: James Bottomley <JBottomley@Parallels.com> 
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.

Cc: stable@vger.kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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