This reverts commit b94b0808.

genksyms currently cannot handle complicated types for exported
percpu variables.  Drop this patch for now as it prevents a
module from being loaded on sn2 systems:

 xpc: no symbol version for per_cpu____sn_cnodeid_to_nasid
 xpc: Unknown symbol per_cpu____sn_cnodeid_to_nasid
Signed-off-by: NTony Luck <tony.luck@intel.com>

Mapping the same memory using two different attributes (memory
type, shareability, cacheability) is unpredictable.  During boot,
we encounter a situation when we're updating the kernel's page
tables which can lead to dirty cache lines existing in the cache
which are subsequently missed.  This causes stack corruption,
and therefore a crash.

Therefore, ensure that the shared and cacheability settings
matches the configuration that will be used later; this together
with the restriction in early_cachepolicy() ensures that we won't
create a mismatch during boot.
Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

ARM unwind is known to compile only with EABI and not-buggy compilers.
The problem is not the unwinding information but the -fno-frame-pointer
option added as a result of !CONFIG_FRAME_POINTER.  Now we check the
compiler and raise a #warning in case of wrong compiler.
Signed-off-by: NClaudio Scordino <claudio@evidence.eu.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This is the fix for proper reboot of Realview ARM1176PB board
when issuing the reboot command. Setting the eighth bit of
control register SYS_RESETCTL to 1 to force a soft reset.
arch_reset() is modified for realview machines to call machine
specific reset function pointers.
Signed-off-by: NPhilby John <pjohn@in.mvista.com>
Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

There isn't much else I can do with these. I can find no hardware for any
of them and no users. The code is broken.
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Errata 411920 indicates that any "invalidate entire instruction cache"
operation can fail if the right conditions are present.  This is not
limited just to those operations in flush.c, but elsewhere.  Place the
workaround in the already existing __flush_icache_all() function
instead.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

When SPARSEMEM_EXTREME is enabled, memory_present() wants to use bootmem
to allocate data structures.  However, we call memory_present() after
declaring memory to bootmem, but before we've reserved areas.

This leads to sparsemem data structures being overwritten later in the
kernel's initialization (when slab initializes.)
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

syscallno is unsigned
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

sigp sense only returns the status of a cpu if it is non zero. If the
status of the sensed cpu is all zeros condition code 0 (accpeted) is
set and no status bits are returned.
The current code however assumes that a status was returned and tests
bits in it. This means uninitalized data is accessed with random
results.
Worst case is that the code that checks if cpu is offline on cpu
hotplug assumes that the target cpu is offline while it is still
running. This leads potentially to memory corruption since resources
that are still needed by the target cpu will be freed and could be
resused while still in use.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

According to the architecture a cpu must not necessarily enter stopped
state after completion of a sigp instruction with "stop" order code.
So remove the BUG() statement after self sending sigp stop to avoid
that it ever gets reached.
Also add a sigp busy check to make sure that the order gets delivered.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

The cputime_to_msecs / cputime_to_clock_t and cputime64_to_clock_t
cause fixpoint divide exceptions if the cputime is too large.
On a machine that collected 49.7 days worth of idle time reading
from /proc/stat will generate oopses like this:

Kernel BUG at 001b0c92 [verbose debug info unavailable]
fixpoint divide exception: 0009 [#13] SMP
Modules linked in: ipv6
CPU: 1 Tainted: G      D   2.6.27.10 #5
Process cat (pid: 21352, task: 1fb34138, ksp: 1d2a3d98)
Krnl PSW : 070c2000 801b0c92 (show_stat+0x2ca/0x68c)
           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:2 PM:0
Krnl GPRS: 00000001 00001388 00000bb8 0015d2a1
           00000000 00000000 000003e8 0001fd91
           00000000 00000000 0000129d eecd2ff0
           1cc533b9 0036f780 801b0bce 1d2a3cc0
Krnl Code: 801b0c86: f18890abf198       mvo     171(9,%r9),408(9,%r15)
           801b0c8c: 98abf170           lm      %r10,%r11,368(%r15)
           801b0c90: 1da1               dr      %r10,%r1
          >801b0c92: 90abf170           stm     %r10,%r11,368(%r15)
           801b0c96: 98abf190           lm      %r10,%r11,400(%r15)
           801b0c9a: 1da1               dr      %r10,%r1
           801b0c9c: 90abf190           stm     %r10,%r11,400(%r15)
           801b0ca0: 18a3               lr      %r10,%r3
Call Trace:
([<00000000001b09f4>] show_stat+0x2c/0x68c)
 [<000000000018dcee>] seq_read+0xb2/0x364
 [<00000000001a9980>] proc_reg_read+0x68/0x98
 [<00000000001705ee>] vfs_read+0x6e/0xe8
 [<0000000000170732>] sys_read+0x36/0x78
 [<000000000010f750>] sysc_do_restart+0x12/0x16
 [<0000000077f3ad6a>] 0x77f3ad6a
 <4>---[ end trace 1436ea9559d3de9e ]---
Reported-by: NMike Frysinger <vapier@gentoo.org>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

Offlined cpus still have valid prefix register contents. Dumpers
will store the register contents of a cpu to the location where its
prefix register points to.
For offlined cpus the area (lowcore) has been freed and the dumper
would write the uninteresting contents of the offline cpu to a memory
location which might be in use by some other component and destroy
valueable information.
To fix this set the prefix register of offline cpus to absolute
address zero again. This prevents the current dumpers to write to
random memory locations.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

xen_setup_stackprotector() ends up trying to set page protections,
so we need to have vm_mmu_ops set up before trying to do so.
Failing to do so causes an early boot crash.

[ Impact: Fix early crash under Xen. ]
Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

The EFI RTC functions are only available on 32 bit. commit 7bd867df
(x86: Move get/set_wallclock to x86_platform_ops) removed the 32bit
dependency which leads to boot crashes on 64bit EFI systems.

Add the dependency back. 
Solves: http://bugzilla.kernel.org/show_bug.cgi?id=14466Tested-by: NMatthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: NFeng Tang <feng.tang@intel.com>
LKML-Reference: <20091020125402.028d66d5@feng-desktop>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Based on an original patch by Valentine Barshak <vbarshak@ru.mvista.com>

Use preempt_schedule_irq to prevent infinite irq-entry and
eventual stack overflow problems with fast-paced IRQ sources.

This kind of problems has been observed on the PASemi Electra IDE
controller. We have to make sure we are soft-disabled before calling
preempt_schedule_irq and hard disable interrupts after that
to avoid unrecoverable exceptions.

This patch also moves the "clrrdi r9,r1,THREAD_SHIFT" out of
the #ifdef CONFIG_PPC_BOOK3E scope, since r9 is clobbered
and has to be restored in both cases.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

Fix the following 3 issues:

arch/powerpc/kernel/process.c: In function 'arch_randomize_brk':
arch/powerpc/kernel/process.c:1183: error: 'mmu_highuser_ssize' undeclared (first use in this function)
arch/powerpc/kernel/process.c:1183: error: (Each undeclared identifier is reported only once
arch/powerpc/kernel/process.c:1183: error: for each function it appears in.)
arch/powerpc/kernel/process.c:1183: error: 'MMU_SEGSIZE_1T' undeclared (first use in this function)

In file included from arch/powerpc/kernel/setup_64.c:60:
arch/powerpc/include/asm/mmu-hash64.h:132: error: redefinition of 'struct mmu_psize_def'
arch/powerpc/include/asm/mmu-hash64.h:159: error: expected identifier or '(' before numeric constant
arch/powerpc/include/asm/mmu-hash64.h:396: error: conflicting types for 'mm_context_t'
arch/powerpc/include/asm/mmu-book3e.h:184: error: previous declaration of 'mm_context_t' was here

cc1: warnings being treated as errors
arch/powerpc/kernel/pci_64.c: In function 'pcibios_unmap_io_space':
arch/powerpc/kernel/pci_64.c:100: error: unused variable 'res'
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

This defconfig's purpose at this time is to help catch compile errors
between Book-3S and Book-3E support in ppc64.  It is based on the
ppc64_defconfig with some things disabled that we dont support on
Book-3E right now (hugetlbfs, slices, etc.)
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

Prior to the arch/ppc -> arch/powerpc transition, xmon had support for single
stepping on 4xx boards.  The functionality was lost when arch/ppc was removed.
This patch restores single step support for 44x boards, and Book-E in general.
Signed-off-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

The ABI specifies a 64K alignment, we need to map the vDSO accordingly
Signed-off-by: NAndreas Schwab <schwab@linux-m68k.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

Due to missing segment assignments the .text section was put in the NOTES
segment (and marked as NOTE section), and the .got was put in the DYNAMIC
segment.
Signed-off-by: NAndreas Schwab <schwab@linux-m68k.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

The creation of the flattened device tree depended on the compiler
putting the constant strings for an object in a section with a
particular name.  This was changed with recent compilers.  Do this
explicitly instead.

Without this patch, iseries kernels may silently not boot when built with
some compilers.
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

The architecture defines that if MSR PR is set we are in problem state
irrespective of the HV bit.  This fixes perf events to reflect this.

Also, on bare metal systems, samples taken in Linux will now be reported
as kernel rather than hypervisor.
Signed-off-by: NMichael Neuling <mikey@neuling.org>
CC: paulus@samba.org
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

The hugetlb dependencies presently depend on SUPERH && MMU while the
hugetlb page size definitions depend on CPU_SH4 or CPU_SH5. This
unfortunately allows SH-3 + MMU configurations to enable hugetlbfs
without a corresponding HPAGE_SHIFT definition, resulting in the build
blowing up.

As SH-3 doesn't support variable page sizes, we tighten up the
dependenies a bit to prevent hugetlbfs from being enabled. These days
we also have a shiny new SYS_SUPPORTS_HUGETLBFS, so switch to using
that rather than adding to the list of corner cases in fs/Kconfig.
Reported-by: NKristoffer Ericson <kristoffer.ericson@gmail.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This was missing from the previous patch.
Reported-by: NMike Frysinger <vapier@gentoo.org>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Restoring %ebp after the call to audit_syscall_exit() is not
only unnecessary (because the register didn't get clobbered),
but in the sysenter case wasn't even doing the right thing: It
loaded %ebp from a location below the top of stack (RBP <
ARGOFFSET), i.e. arbitrary kernel data got passed back to user
mode in the register.
Signed-off-by: NJan Beulich <jbeulich@novell.com>
Acked-by: NRoland McGrath <roland@redhat.com>
Cc: <stable@kernel.org>
LKML-Reference: <4AE5CC4D020000780001BD13@vpn.id2.novell.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Non-PAE 32-bit dump kernels may wrap an address around 4G and
poke unwanted space. ptes there are 32-bit long, and since
pfn << PAGE_SIZE may exceed this limit, high pfn bits are
cropped and wrong address mapped by kmap_atomic_pfn in
copy_oldmem_page.

Don't allow this behavior in non-PAE kdump kernels by checking
pfns passed into copy_oldmem_page. In the case of failure,
userspace process gets EFAULT.

[v2]
- fix comments
- move ifdefs inside the function
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Paul Mundt <lethal@linux-sh.org>
LKML-Reference: <1256551903-30567-1-git-send-email-jirislaby@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Commit 79e1dd05 "x86: Provide an alternative() based
cmpxchg64()" broke lguest, even on systems which have cmpxchg8b
support.  The emulation code gets used until alternatives get
run, but it contains native instructions, not their paravirt
alternatives.

The simplest fix is to turn this code off except for 386 and 486
builds.
Reported-by: NJohannes Stezenbach <js@sig21.net>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
Acked-by: NH. Peter Anvin <hpa@zytor.com>
Cc: lguest@ozlabs.org
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <200910261426.05769.rusty@rustcorp.com.au>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Add an uImage.bin target to allow uncompressed uImages.
Useful for boards with busted u-boot decompression like
the rsk7203 on my desk.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Fix the rsk7203 board code to build with CONFIG_MTD=n.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

When CONFIG_FUNCTION_GRAPH_TRACER is enabled the function graph tracer
may patch return addresses on the stack with the address of
return_to_handler(). This really confuses the DWARF unwinder because it
will try find the caller of return_to_handler(), not the caller of the
real return address.

So teach the DWARF unwinder how to find the real return address whenever
it encounters return_to_handler().

This patch does not cope very well when multiple return addresses on the
stack have been patched. To make it work properly it would require state
to track how many return_to_handler()'s have been seen so that we'd know
where to look in current->curr_ret_stack[]. So for now, instead of
trying to handle this, just moan if more than one return address on the
stack has been patched.
Signed-off-by: NMatt Fleming <matt@console-pimps.org>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

ERROR: "__movmemSI12" [net/unix/unix.ko] undefined!
ERROR: "__movmemSI52" [net/ipv6/sit.ko] undefined!
ERROR: "__movmemSI24" [net/ipv6/ipv6.ko] undefined!
ERROR: "__movmemSI60" [net/ipv6/ipv6.ko] undefined!
ERROR: "__movmemSI16" [net/ipv6/ipv6.ko] undefined!
ERROR: "__movmemSI20" [net/ipv6/ipv6.ko] undefined!
ERROR: "__movmemSI32" [net/ipv6/ipv6.ko] undefined!
Signed-off-by: NLubomir Rintel <lkundrak@v3.sk>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This adds an __irq_entry annotation for do_IRQ() so that the IRQ
annotation in the function graph tracer works as advertized. We already
have the IRQENTRY section wired up, so this is just a trivial addition
to actually make use of it.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

We were using GFP_DMA for masks other than 0xffffffff, which is
wrong when some masks are initialized to 0xffffffffffffffff.
This caused such masks to obtain memory from the precious DMA
pool.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This fixes Integrator builds with highmem enabled; we need to
translate from 'struct page' to a DMA address, and this is not
possible without __pfn_to_bus().
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

The signal restarting code was placed on the user stack when OABI
compatibility is enabled.  Unfortunately, with an EABI NX executable,
this results in an attempt to run code from the non-executable stack,
which segfaults the application.

Fix this by placing the code in the vectors page, along side the
signal return code, and directing the application to that code.
Reported-by: Nsaeed bishara <saeed.bishara@gmail.com>
Tested-by: Nsaeed bishara <saeed.bishara@gmail.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

STACKPROTECTOR_ALL has a really high overhead (runtime and stack
footprint) and is not really worth it protection wise (the
normal STACKPROTECTOR is in effect for all functions with
buffers already), so lets just remove the option entirely.
Reported-by: NDave Jones <davej@redhat.com>
Reported-by: NChuck Ebbert <cebbert@redhat.com>
Signed-off-by: NArjan van de Ven <arjan@linux.intel.com>
Cc: Eric Sandeen <sandeen@redhat.com>
LKML-Reference: <20091023073101.3dce4ebb@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

This patch removes the unnecessary UART4 platform which is under
data is wrong because of this

There is a separate platform structure for UART4
Signed-off-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-By: NKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

This patch enables omap_serial_early_init() function for OMAP4430
SDP. Without this the bootup would throw oops in omap_serial_init().

Note that the ifndef CONFIG_ARCH_OMAP4 is split into two sections
to enable omap_serial_early_init(). This ifndef cannot be removed
until omap4 clock framework is implemented.
Signed-off-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-By: NTony Lindgren <tony@atomide.com>
Reviewed-By: NKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

UART3 is in the PER powerdomain.  If PER goes idle/inactive
independently of CORE, for UART3 to wakeup it must have its wakeup
enable bits setup in PM_WKEN_PER.  This patch enables these bits.

The reason it works when PER and CORE work together is because when
CORE goes inactive/retention, the IOPAD wakeups are enabled and
trigger UART3 wakeup.

Without this patch, when the UART inactivity timer fires for UART3,
its clocks are disabled and it's unable to wakeup so will be unusable
until PER is awoken by another source.

Another way of testing is by keeping CORE on during suspend but
allowing PER to hit retention

  # echo 3 > /debug/pm_debug/core_pwrdm/suspend

then enter suspend

  # echo mem > /sys/power/state

Without this patch, UART3 will be unable to wakeup the system.
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

With the recent changes omap serial ports match the physical
numbering like they should. Fix the kernel CMDLINE accordingly
so console works.
Signed-off-by: NTony Lindgren <tony@atomide.com>