Kudos to Thibaut Varene for spotting the (mis)use of appropriately named
global_ack_eiem. This took a long time to figure out and both insight
from myself, Kyle McMartin, and James Bottomley were required to narrow
down which bit of code could have this race condition.

The symptom was interrupts stopped getting delivered while some workload
was generating IO interrupts on two different CPUs. One of the interrupt
sources would get masked off and stay unmasked. Problem was global_ack_eiem
was accessed with read/modified/write sequence and not protected by
a spinlock.

PA-RISC doesn't need a global ack flag though. External Interrupts
are _always_ delivered to a single CPU (except for "global broadcast
interrupt" which AFAIK currently is not used.) So we don't have to worry
about any given IRQ vector getting delivered to more than one CPU.

Tested on a500 and rp34xx boxen. rsync to/from gsyprf11 (a500)
would lock up the box since NIC (tg3) interrupt and SCSI (sym2)
were on "opposite" CPUs (2 CPU system). Put them on the same CPU
or apply this patch and 10GB of data would rsync completely.

Please apply the following critical patch.

thanks,
grant
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Acked-by: Thibaut VARENE <T-Bone@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

check_ivt had some seriously broken code wrt function pointers on
parisc64. Instead of referencing the hpmc code via a function pointer,
export symbols and reference it as a const array.

Thanks to jda for pointing out the broken 64-bit func ptr handling.
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

The bug was that we were comparing __NR_syscalls to be greater or equal
to the syscall number stored in %r20. __NR_syscalls is one greater than
the last syscall though, so we're loading one entry beyond the end of the
syscall table, and trying to jump to it.

Fix this by only checking that we're greater, alternatively, we could
have compared to (__NR_Linux_syscalls - 1)
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

While debugging, I noticed we don't check the task_struct arg passed to
get_wchan, whereas everyone else does.
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Amazingly, parisc was the only arch effected by this...
Convert register-sized loads/stores to always be 32-bit for these fields.
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

commit ffb45122 removed one too many args.
kallsyms_lookup is not safe to call with a NULL *modname. Paper bag over the
problem for the time being.
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Noticed by John David Anglin.
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Kyle,

This patch removes remnants of softirq support that we no longer need.
I suspect this was just overlooked when willy convert parisc to generic
IRQ support.

Tested on c3600 32-bit UP.
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
[and tested on a c8000 64-bit SMP --kyle]
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

WARNING: arch/parisc/kernel/built-in.o(.text.__cpu_up+0x20): Section mismatch: reference to .init.text:smp_boot_one_cpu (after '__cpu_up')
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Thanks to James for noticing.

It fixes:
fs/ext3/xattr.c:65:1: warning: "ENTRY" redefined
In file included from include/linux/linkage.h:4,
                 from include/linux/fs.h:271,
                 from fs/ext3/xattr.c:54:
include/asm/linkage.h:13:1: warning: this is the location of the previous definition
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Wire up utimensat/signalfd/timerfd/eventfd syscalls and mark
select/fadvise64/utimes to be ignored by checksyscalls.sh
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

This patch fixes two section mismatches in superio serial setup:
WARNING: drivers/built-in.o(.text.superio_serial_init+0x78): Section mismatch: reference to .init.text:early_serial_setup (after 'superio_serial_init')
WARNING: drivers/built-in.o(.text.superio_serial_init+0xa4): Section mismatch: reference to .init.text:early_serial_setup (after 'superio_serial_init')
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Hi Kyle,

this patch fixes the following section mismatch (EISA cards should be hotplug aware, but the EISA bus itself shouldn't):
WARNING: drivers/built-in.o(.text.eisa_probe+0x220): Section mismatch: reference to .init.text:eisa_root_register (after 'eisa_probe')

Please apply,
Helge
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Hi Kyle,

this patch fixes two section mismatches in arch/parisc/kernel:
WARNING: arch/parisc/kernel/built-in.o(.data.read_mostly+0xd8): Section mismatch: reference to .init.text:processor_probe (between 'cpu_driver' and 'boot_cpu_data')
WARNING: arch/parisc/kernel/built-in.o(.text.alloc_pa_dev+0x140): Section mismatch: reference to .init.text:parisc_hardware_description (after 'alloc_pa_dev')

Additionally, mark some tables as constants.

Please apply, Helge
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Hi Kyle,

this fixes section mismatches in ccio-dma.
Additionally, mark parisc_device_id table const.

Please apply, Helge
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Hi Kyle,

this patch fixes various section mismatches in the sti graphics driver:
WARNING: drivers/built-in.o(.text.sticore_pci_init+0xac): Section mismatch: reference to .init.text:sti_try_rom_generic (after 'sticore_pci_init')
WARNING: drivers/built-in.o(.text.sticore_pci_init+0xe4): Section mismatch: reference to .init.text:sticore_check_for_default_sti (after 'sticore_pci_init')
WARNING: drivers/built-in.o(.text.sti_get_rom+0x18): Section mismatch: reference to .init.text:sti_init_roms (after 'sti_get_rom')
(and others).

Basically it's a replacement of __init by __devinit.
Please apply, Helge
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

<linux/pm.h> is no longer implicitly included.
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Clean up ROUNDUP, Use ALIGN where ever appropriate.
Signed-off-by: Milind Arun Choudhary <milindchoudhary@gmail.com>
Acked-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

ROUND_UP macro cleanup, use ALIGN where ever appropriate
Signed-off-by: Milind Arun Choudhary <milindchoudhary@gmail.com>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Spelling fixes in arch/parisc/.
Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Acked-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

The LWS debugging code on parisc is wrongly enabled due to a bug in the
use of the preprocessor directives. This debugging code is not thread
safe and causes problems with a recent glibc on SMP kernels.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

As side effect, remove one more ->get_info user and a novel approach of content
generation:

	sprintf(buf, "%sfoo", buf, ...);
	sprintf(buf, "%sbar", buf, ...);
		...

Compile-tested.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Definitely unimplemented at this point and will just
trap to sys_ni_syscall...
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Add VERIFY_WRITE check in the beginning like compat_sys_getdents() EFAULT on
parisc if put_user() fails.
Signed-off-by: Alexandr Andreev <aandreev@openvz.org>
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Matthew Wilcox <willy@debian.org>
Cc: Grant Grundler <grundler@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

commit e8edc6e0 added an include of
linux/jiffies.h in linux/smb_fs.h outside the ifdef __KERNEL__.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This should make it stop immediately after printing the _helpful_ error
message, rather than continuing to spit out many pages more of 'CHECK
include/linux/foo.h' before eventually coming to a halt with something
less obvious.

Now I get this...
  CHECK   include/linux/smb_fs.h
/shiny/git/linux-2.6/usr/include/linux/smb_fs.h requires linux/jiffies.h, which does not exist in exported headers
make[2]: *** [/shiny/git/linux-2.6/usr/include/linux/.check.smb_fs.h] Error 1
make[1]: *** [linux] Error 2
make: *** [headers_check] Error 2

Signed-off-by-if-Sam-says-so: David Woodhouse <dwmw2@infradead.org>
[ Sam had better say so! This made me waste way too much time. - Linus]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This from a "tested" patch...
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Cc: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This reverts commit f892b7d4, which
totally broke the build on x86 with CONFIG_RELOCATABLE (which, as far as
I can tell, is the only case where it should even matter!) due to a
SIGSEGV in modpost.

Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6:
  Add constant for FCS/CRC length (frame check sequence)
  declance: Remove a dangling spin_unlock_irq() thingy
  e1000: Don't enable polling in open() (was: e1000: assertion hit in e1000_clean(), kernel 2.6.21.1)

* 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  libata: bump versions
  libata: Trim trailing whitespace
  libata: Kiss post_set_mode goodbye
  ata_piix: clean up
  pata_hpt366: Enable bits are unreliable so don't use them
  libata: Add Seagate STT20000A to DMA blacklist.
  ahci: disable 64bit dma on sb600

Signed-off-by: Jeff Garzik <jeff@garzik.org>

Signed-off-by: Jeff Garzik <jeff@garzik.org>

As of the -mm tree we don't have post_set_mode users any more.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

With cable methods in place we don't need a custom error handler for SATA
so get rid of it
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>