When the thread_info->addr_limit changes were introduced, __access_ok()
was missed in the conversion, allowing user processes to perform P1/P2
accesses under certain conditions.

This has already been corrected with the nommu refactoring in later
kernels.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

In the do_execve() path, argument page handling used to explicitly call
flush_dcache_page() for each page, this has since been reworked and
uses flush_kernel_dcache_page() instead, which is presently a nop.

Doing a simple modprobe/rmmod in a loop under busybox consistently
manages to crash without providing a sane flush_kernel_dcache_page()
implementation, so, plug in a simple implementation.

Signed-off-by: Carmelo Amoroso <carmelo73@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Signed-off-by: Heiko Schocher <heiko.schocher@invitel.hu>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Signed-off-by: Jiri Olsa <olsajiri@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

We have nothing to do here, but there are continually drivers that
fail to build without it. Stub it in.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

PAGE_KERNEL_PCC() takes two arguments, which weren't reflected in the
nommu case. Fix it up.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Now that copy_to_user_page()/copy_from_user_page() are wired up, we
can drop the old __copy_xxx() implementations. Now that the page
colouring scheme has changed via kmap_coherent(), we can avoid the
flush in these specific helpers.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

This moves copy_{to,from}_user_page() out-of-line on SH-4 and
converts for the kmap_coherent() API. Based on the MIPS
implementation.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

With the kmap_coherent() API in place, this is trivial to implement,
and lets us avoid the cache flush in certain cases.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>