Problem:
	There exists a case where we stop monitoring, i.e. clear
	psr.pp/dcr.pp, via IPI. This is when the stop is triggered
	by a close(), either explicit in the application or implicit
	via exit_files(). The IPI is necessary because at the time the
	thread (controlling the context) issues a close() it may not run
	on the CPU the context is bound to. Yet the call must succeed,
	hence we need to propagate the call to the right CPU.
	But what is the problem then?
	Under IPI, we invoke a perfmon routine which clear the kernel
	(live) kernel psr.pp bit and also dcr.pp. Then we return from
	the function and execute the kernel exit path which restores
	the interrupted state. Unfortunately, this restores the kernel
	psr from ipsr which now contains a stale value. Therefore
	monitoring in the kernel will be active even though we stopped it.
	You cannot modify the "global" psr in an interrupt routine because
	it will be systematically restored on the way back.
	
Solution:
	We need to patch ipsr.pp in the kernel exit path to reflect the
	kernel value of the kernel psr.pp bit. This must be done only when
	returning to kernel. 

	The proposed patch does patch ipsr.pp such that it is identical
	to psr.pp. The patch is subtle because the exit path does not have
	a lot of free registers and also because we need to schedule for
	a psr read. I had to shuffle  things around a little bit.

	The patch is important because there will be another situation where
	this problem can occur once we incorporate the support for event set
	and multiplexing. In this configuration, you may be in the middle of
	the idle loop and on a timer interrupt, you may stop monitoring.
	Slightly different condition, yet same problem with ipsr.pp vs. psr.pp.


Changelog:
	- update kernel exit path when returning to kernel to copy
	psr.pp to ipsr.pp. This is necesary to ensure that if psr.pp
	was modified during the kernel entry, the change is propagated
	the the psr.pp of the of the interrupted thread. Psr.pp can
	be modified as a consequence of an IPI under certain conditions,
	such as when a system-wide context is closed from a remote CPU.

Special thanks to David for reworking the patch to fit
into the enhanced exit path.
signed-off-by: stephane eranian <eranian@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Patch from yanmin.zhang@intel.com to fix up some corner cases
in ptrace.  Many thanks to davidm for reviewing and improving.
Signed-off-by: Tony Luck <tony.luck@intel.com>

Label is unused, and so the compiler generates a warning.
Signed-off-by: Tony Luck <tony.luck@intel.com>

Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Use srlz.d instead of srlz.i.  Safe because we don't care whether
the VHPT walker sees the clearing of PSR.ic (if it does, that's fine
if it doesn't, it's OK too since the kernel-text is pinned anyhow).
Good for another 11+ cycles in (normal) getpid().
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Optimize ia64_leave_syscall() a bit better for McKinley-type cores.
The patch looks big, but that's mostly due to renaming r16/r17 to r2/r3.
Good for a 13 cycle improvement.
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Trivial patch: align rse_clear_invalid to 32-byte boundary.  Good for
a 9 cycle speed up.
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Kernel-threads had both pUStk and pKStk set to FALSE, which was
unintentional.  I don't think the bug has shown any ill effects, but
it's clearly wrong and could come around to bite us later, so let's
fix it now.  Depends on the previous patch to clean up C usage of the
global/root-function predicates.
Signed-off-by: Tony Luck <tony.luck@intel.com>

 
The patch below is purely a cleanup but it's a prerequisite for the
next bug fix patch.
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Use msleep() instead of schedule_timeout() to guarantee the task
delays as expected.
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

The fixed sized array of pages that are isolated because of 2xECC
memory errors can run out.  Increasing the size of the array is a
band-aid measure, the real fix will require changes to generic code
to add some bits to page_flags so that pages with errors can be
marked so as to prevent them ever being examined.
Signed-off-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

When compiling for non-NUMA variable "node" ended up not being used,
which solicits a warning from GCC.  Fix is to evluate cpu_to_node(i)
in place.  This has the effect of doing cpu_to_node(i) twice on NUMA,
but this is init code, so performance is not an issue (and even if
it were, you can just declare cpu_to_node() as being a pure function,
so the compiler can eliminate the second call).
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

I was getting a lot of spurious warnings with "make C=1", due to a
missing "__user" attribute.  I'm not sure whether this got lost or
whether earlier versions of sparse failed to warn about it, but it's
clearly needed (and the i386 version of uaccess.h does the same).
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

It seems that in ia64_elf32_init, instead of calling return, if we insert
an overlapping vma, we should instead BUG(). We should never get into this
code path, because the vma's are set above PAGE_OFFSET, and thus a
Xmalicious user can not trigger this code path. This change is being
suggested mainly for clarity. Thanks to Stephen Tweedie for pointing out
that returning early in ia64_elf32_init could have unpredictable results.
Signed-off-by: Tony Luck <tony.luck@intel.com>

Fix the error handling for the SN2 hardware perf ioctl interface.
Signed-off-by: Mark Goodwin <markgw@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Signed-off-by: Bob Picco <bob.picco@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

Signed-off-by: Tony Luck <tony.luck@intel.com>

into intel.com:/data/home/aegl/BK/linux-ia64-release-2.6.11

into ppc970.osdl.org:/home/torvalds/v2.6/linux

Patch from Richard Purdie

Add USB Device Controller support to the corgi machines
(Sharp SL-C7xx series).

Signed-off-by: Richard Purdie
Signed-off-by: Russell King

Patch from Richard Purdie

Make sure the PXA Corgi ssp driver flushes the ssp port before
suspending.

Signed-off-by: Richard Purdie
Signed-off-by: Russell King

Patch from Ben Dooks

Add overview of the HP iPAQ rx3715, as well as
listing Shannon Holland in the contributors.

Signed-off-by: Ben Dooks
Signed-off-by: Russell King

Patch from Nicolas Pitre

Signed-off-by: Nicolas Pitre
Signed-off-by: Russell King

into ppc970.osdl.org:/home/torvalds/v2.6/linux

Patch from Pierre Ossman

This patch includes the latest changes to the wbsd driver.
* Proper usage of kunmap.
* Comment about hw bugs.
* Waits for data transfers to finish properly.
* Added module version info.
* FIFO bug fix for small reads.
* Optimised FIFO loop.
* DMA demand mode.
* IRQ race condition when sending commands fixed.

into intel.com:/data/home/aegl/BK/linux-ia64-release-2.6.11

into ppc970.osdl.org:/home/torvalds/v2.6/linux

The RLIMIT_CPU limit is in seconds, not in jiffies.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

There's 1000 msecs in a second. No relation to HZ, which just
happens to be 1000 in some cases.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

The x86-64 kernel incorrectly marks the 32-bit vsyscall page mapping at
virtual address 0xffffe000 as a global one, even though that mapping
does not exist globally.  As such, task switches do not correctly
invalidate the mapping, and strange behaviour ensues if a 64-bit program
happens to use that same virtual address for something else.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

If md resides on top of a driver using bio_clone() (such as dm), it will
oops the kernel due to md submitting a botched bio that has a veclist but
doesn't have bio->bi_max_vecs set.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

into intel.com:/data/home/aegl/BK/linux-ia64-release-2.6.11

Make the declaration match the definition..
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Use the new lock initializers DEFINE_SPIN_LOCK and DEFINE_RW_LOCK
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>