Add a general per-cpu notifier that is called whenever the kernel is
about to return to userspace.  The notifier uses a thread_info flag
and existing checks, so there is no impact on user return or context
switch fast paths.

This will be used initially to speed up KVM task switching by lazily
updating MSRs.
Signed-off-by: NAvi Kivity <avi@redhat.com>
LKML-Reference: <1253342422-13811-1-git-send-email-avi@redhat.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

cmpxchg64() today generates, to quote Linus, "barf bag" code.

cmpxchg64() is about to get used in the scheduler to fix a bug there,
but it's a prerequisite that cmpxchg64() first be made non-sucking.

This patch turns cmpxchg64() into an efficient implementation that
uses the alternative() mechanism to just use the raw instruction on
all modern systems.

Note: the fallback is NOT smp safe, just like the current fallback
is not SMP safe. (Interested parties with i486 based SMP systems
are welcome to submit fix patches for that.)
Signed-off-by: NArjan van de Ven <arjan@linux.intel.com>
Acked-by: NLinus Torvalds <torvalds@linux-foundation.org>
[ fixed asm constraint bug ]
Fixed-by: NEric Dumazet <eric.dumazet@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090930170754.0886ff2e@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/mips/include/asm/unaligned.h: linux/unaligned/generic.h is included more than once.

Entirely legitimate but just noise.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

It's not obvious what good it was supposed to do here anyway.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NMaxime Bizon <mbizon@freebox.fr>
Reviewed-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Produce an error if request_irq() fails.
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Cc: "Ithamar R. Adema" <ithamar.adema@team-embedded.nl>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

There are 16 individual channels (NUM_DBDMA_CHANS) to save/restore plus the
global ddma block config (the +1).  The last register in a channel can be
skipped since it's read-only (at offset 0x18).
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Cc: Manuel Lauss <manuel.lauss@googlemail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

commit 48a048fe
Author: Rusty Russell <rusty@rustcorp.com.au>
Date:   Thu Sep 24 09:34:44 2009 -0600

apparently only passed the "looks good" level of QA ;-)
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

This extends commit a8ca8b64 to cover
MIPSxx-style board cache code.
Signed-off-by: NKevin Cernekee <cernekee@gmail.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Build error introduced by d4f587c6.
Signed-off-by: NMark Mason <mmason@upwardaccess.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Patch 14275ccdb1e4b487cca745aba994699c426a31ee and
d5dedd45 are conflicting and the
conflict was resolved badly in merge
92241940be501f798cb21db344bbb3d1ec3c4f1c resulting in the BCM1480 changes
of 14275ccdb1e4b487cca745aba994699c426a31ee getting lost.  Sort out the
damage.

Reported and initial patch by Mark Mason <mmason@upwardaccess.com>.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NMaxime Bizon <mbizon@freebox.fr>
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Yanhua <yanh@lemote.com>
Cc: Robert Richter <robert.richter@amd.com>
Acked-by: NWu Zhangjin <wuzj@lemote.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The definition of the irq_ipi structure has two initializations of the
flags field.  This combines them.

[Ralf: The issue was originally introduced by commit
be4894196d79455f420dd7bb78be7dc73bec115c (linux-mips.org) rsp.
033890b0 (kernel.org).  The original
intention of the code was to initialize .flags with both flags ored together.
The broken C code as actually implemented will be compiled by an equally
broken gcc to use only the last initialization, that is IRQF_PERCPU
which means this turned into an SMTC bug for 2.6.23 and newer.]

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier I, s, fld;
position p0,p;
expression E;
@@

struct I s =@p0 { ... .fld@p = E, ...};

@s@
identifier I, s, r.fld;
position r.p0,p;
expression E;
@@

struct I s =@p0 { ... .fld@p = E, ...};

@script:python@
p0 << r.p0;
fld << r.fld;
ps << s.p;
pr << r.p;
@@

if int(ps[0].line)!=int(pr[0].line) or int(ps[0].column)!=int(pr[0].column):
  cocci.print_main(fld,p0)
// </smpl>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Remove duplicated #include in arch/mips/kernel/smp.c.
Signed-off-by: NHuang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Remove duplicated #include in arch/mips/bcm63xx/boards/board_bcm963xx.c.
Signed-off-by: NHuang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

This reverts commit 22223c9b, as
requested by Andi Kleen:

  "Obviously kernels compiled with AMD support can still run on non AMD
   systems, so messages like this can never be removed at compile time."
Requsted-by: NAndi Kleen <andi@firstfloor.org>
Cc: Borislav Petkov <borislav.petkov@amd.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Implement page mapping percpu first chunk allocator as a fallback to
the embedding allocator.  The next patch will make the embedding
allocator check distances between units to determine whether it fits
within the vmalloc area so that this fallback can be used on such
cases.

sparc64 currently has relatively small vmalloc area which makes it
impossible to create any dynamic chunks on certain configurations
leading to percpu allocation failures.  This and the next patch should
allow those configurations to keep working until proper solution is
found.

While at it, mark pcpu_cpu_distance() with __init.
Signed-off-by: NTejun Heo <tj@kernel.org>
Acked-by: NDavid S. Miller <davem@davemloft.net>

It's worked fine so far since reset is done for the first time.
Reported-by: NJuha Leppanen <juha_motorsportcom@luukku.com>
Signed-off-by: NHiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: NJuha Leppanen <juha_motorsportcom@luukku.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

.. duplicated by merging the same fix twice, for details see commit
0d9df251 ("Merge
git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes")
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* mark struct vm_area_struct::vm_ops as const
* mark vm_ops in AGP code

But leave TTM code alone, something is fishy there with global vm_ops
being used.
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

ia64's sim_defconfig uses CONFIG_ACPI=n
which now #define's acpi_disabled in <linux/acpi.h>

So we shouldn't re-define it here in <asm/acpi.h>
Signed-off-by: NLen Brown <len.brown@intel.com>

This build failure triggers:

 In file included from include/linux/suspend.h:8,
                 from arch/x86/kernel/asm-offsets_32.c:11,
                 from arch/x86/kernel/asm-offsets.c:2:
 include/linux/mm.h:503:2: error: #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS

Because due to the hwpoison page flag we ran out of page
flags on 32-bit.

Dont turn on hwpoison on 32-bit NUMA (it's rare in any
case).

Also clean up the Kconfig dependencies in the generic MM
code by introducing ARCH_SUPPORTS_MEMORY_FAILURE.
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Don't disable ARB_DISABLE when the familary ID is 0x0F.

http://bugzilla.kernel.org/show_bug.cgi?id=14211

This was a 2.6.31 regression, and so this patch
needs to be applied to 2.6.31.stable
Signed-off-by: NZhao Yakui <yakui.zhao@intel.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

Commit 200b812d "Clear the exclusive monitor when returning from an
exception" broke the vast majority of ARM systems in the wild which are
still pre ARMv6.  The kernel is crashing on the first occurrence of an
exception due to the removal of the actual return instruction for them.
Let's add it back.
Signed-off-by: NNicolas Pitre <nico@marvell.com>
Acked-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Add include to get missing THREAD_SIZE definition
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Cc: Tim Abbott <tabbott@ksplice.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>

Commit 51b563fc ("arm, cris, mips,
sparc, powerpc, um, xtensa: fix build with bash 4.0") removed a few
CPPFLAGS with vital include paths necessary to build vmlinux.lds
on MIPS, and moved the calculation of the 'jiffies' symbol
directly to vmlinux.lds.S but forgot to change make ifdef/... to
cpp macros.
Signed-off-by: NManuel Lauss <manuel.lauss@gmail.com>
[sam: moved assignment of CPPFLAGS arch/mips/kernel/Makefile]
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Acked-by: NDmitri Vorobiev <dmitri.vorobiev@movial.com>

Back in January 2008 Nick Piggin implemented "ticket" spinlocks
for X86 (See commit 314cdbef).

IA64 implementation has a couple of differences because of the
available atomic operations ... e.g. we have no fetchadd2 instruction
that operates on a 16-bit quantity so we make ticket locks use
a 32-bit word for each of the current ticket and now-serving values.

Performance on uncontended locks is about 8% worse than the previous
implementation, but this seems a good trade for determinism in the
contended case. Performance impact on macro-level benchmarks is in
the noise.
Signed-off-by: NTony Luck <tony.luck@intel.com>

Signed-off-by: NNobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Signed-off-by: NNobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

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

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

Signed-off-by: NKuninori Morimoto <morimoto.kuninori@renesas.com>
Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Flash mappings for the MB93090-MB00 evaluation motherboard.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Note that .data.page_aligned and .data.cacheline_aligned are now after
_data; it was probably a bug that they were before it.

Also, some explicit ALIGN(8)'s between various initcall sections were
removed; this should be harmless as the implicit alignment of
initcall_t was already 8.
Signed-off-by: NGeoffrey Thomas <geofft@ksplice.com>
Signed-off-by: NTim Abbott <tabbott@ksplice.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

alpha is the only architecture that uses the section name
.data.init_thread instead of .data.init_task.  So convert alpha to use
.data.init_task like everything else.

.data.init_task does not need a separate output section; this change
also moves it into the .data output section.
Signed-off-by: NTim Abbott <tabbott@mit.edu>
Cc: Richard Henderson <rth@twiddle.net>
Cc: linux-alpha@vger.kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>