The code was written as it is because it's more expressive, a bit easier.
But it's always been dirty, if not a bug.  But we can't cheat with LTO
compilers, so this results in:

[...]
  LDFINAL vmlinux.o
In file included from arch/mips/kernel/topology.c:604:0,
                 from arch/mips/kernel/time.c:212,
                 from arch/mips/kernel/syscall.c:300,
                 from arch/mips/kernel/signal.c:853,
                 from arch/mips/kernel/setup.c:1030,
                 from arch/mips/kernel/reset.c:354,
                 from arch/mips/kernel/ptrace.c:562,
                 from arch/mips/kernel/process.c:770,
                 from arch/mips/kernel/irq.c:350,
                 from arch/mips/kernel/branch.c:321,
                 from arch/mips/kernel/cpu-probe.c:1370,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:345,
                 from arch/mips/sgi-ip22/ip22-gio.c:660,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/sgialib.h:219,
                 from arch/mips/sgi-ip22/ip22-reset.c:224,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/paccess.h:116,
                 from arch/mips/sgi-ip22/ip22-nvram.c:334,
                 from include/linux/kernel_stat.h:79,
                 from arch/mips/sgi-ip22/ip22-int.c:592,
                 from arch/mips/sgi-ip22/ip22-hpc.c:470,
                 from arch/mips/sgi-ip22/ip22-mc.c:135,
                 from init/init_task.c:54,
                 from init/calibrate.c:744,
                 from init/noinitramfs.c:62,
                 from init/do_mounts.c:573,
                 from init/version.c:1009,
                 from init/main.c:777,
                 from :729:
arch/mips/kernel/traps.c:63:49: error: variable ‘handle_tlbl’ redeclared as function
In file included from arch/mips/mm/page.c:310:0,
                 from arch/mips/mm/mmap.c:208,
                 from arch/mips/mm/init.c:641,
                 from arch/mips/mm/gup.c:811,
                 from arch/mips/mm/fault.c:659,
                 from include/linux/module.h:682,
                 from arch/mips/mm/dma-default.c:161,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:397,
                 from arch/mips/kernel/i8253.c:538,
                 from arch/mips/kernel/proc.c:145,
                 from arch/mips/kernel/irq_cpu.c:129,
                 from arch/mips/kernel/i8259.c:229,
                 from include/uapi/linux/elf.h:251,
                 from arch/mips/kernel/mips_ksyms.c:129,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/time.h:50,
                 from arch/mips/kernel/cevt-r4k.c:90,
                 from arch/mips/kernel/vdso.c:136,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:351,
                 from arch/mips/kernel/unaligned.c:809,
                 from arch/mips/kernel/traps.c:1720,
                 from arch/mips/kernel/topology.c:684,
                 from arch/mips/kernel/time.c:212,
                 from arch/mips/kernel/syscall.c:300,
                 from arch/mips/kernel/signal.c:853,
                 from arch/mips/kernel/setup.c:1030,
                 from arch/mips/kernel/reset.c:354,
                 from arch/mips/kernel/ptrace.c:562,
                 from arch/mips/kernel/process.c:770,
                 from arch/mips/kernel/irq.c:350,
                 from arch/mips/kernel/branch.c:321,
                 from arch/mips/kernel/cpu-probe.c:1370,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:345,
                 from arch/mips/sgi-ip22/ip22-gio.c:660,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/sgialib.h:219,
                 from arch/mips/sgi-ip22/ip22-reset.c:224,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/paccess.h:116,
                 from arch/mips/sgi-ip22/ip22-nvram.c:334,
                 from include/linux/kernel_stat.h:79,
                 from arch/mips/sgi-ip22/ip22-int.c:592,
                 from arch/mips/sgi-ip22/ip22-hpc.c:470,
                 from arch/mips/sgi-ip22/ip22-mc.c:135,
                 from init/init_task.c:54,
                 from init/calibrate.c:744,
                 from init/noinitramfs.c:62,
                 from init/do_mounts.c:573,
                 from init/version.c:1009,
                 from init/main.c:777,
                 from :729:
arch/mips/mm/tlbex.c:1448:5: note: previously declared here
In file included from arch/mips/kernel/topology.c:604:0,
                 from arch/mips/kernel/time.c:212,
                 from arch/mips/kernel/syscall.c:300,
                 from arch/mips/kernel/signal.c:853,
                 from arch/mips/kernel/setup.c:1030,
                 from arch/mips/kernel/reset.c:354,
                 from arch/mips/kernel/ptrace.c:562,
                 from arch/mips/kernel/process.c:770,
                 from arch/mips/kernel/irq.c:350,
                 from arch/mips/kernel/branch.c:321,
                 from arch/mips/kernel/cpu-probe.c:1370,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:345,
                 from arch/mips/sgi-ip22/ip22-gio.c:660,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/sgialib.h:219,
                 from arch/mips/sgi-ip22/ip22-reset.c:224,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/paccess.h:116,
                 from arch/mips/sgi-ip22/ip22-nvram.c:334,
                 from include/linux/kernel_stat.h:79,
                 from arch/mips/sgi-ip22/ip22-int.c:592,
                 from arch/mips/sgi-ip22/ip22-hpc.c:470,
                 from arch/mips/sgi-ip22/ip22-mc.c:135,
                 from init/init_task.c:54,
                 from init/calibrate.c:744,
                 from init/noinitramfs.c:62,
                 from init/do_mounts.c:573,
                 from init/version.c:1009,
                 from init/main.c:777,
                 from :729:
arch/mips/kernel/traps.c:62:49: error: variable ‘handle_tlbm’ redeclared as function
In file included from arch/mips/mm/page.c:310:0,
                 from arch/mips/mm/mmap.c:208,
                 from arch/mips/mm/init.c:641,
                 from arch/mips/mm/gup.c:811,
                 from arch/mips/mm/fault.c:659,
                 from include/linux/module.h:682,
                 from arch/mips/mm/dma-default.c:161,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:397,
                 from arch/mips/kernel/i8253.c:538,
                 from arch/mips/kernel/proc.c:145,
                 from arch/mips/kernel/irq_cpu.c:129,
                 from arch/mips/kernel/i8259.c:229,
                 from include/uapi/linux/elf.h:251,
                 from arch/mips/kernel/mips_ksyms.c:129,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/time.h:50,
                 from arch/mips/kernel/cevt-r4k.c:90,
                 from arch/mips/kernel/vdso.c:136,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:351,
                 from arch/mips/kernel/unaligned.c:809,
                 from arch/mips/kernel/traps.c:1720,
                 from arch/mips/kernel/topology.c:684,
                 from arch/mips/kernel/time.c:212,
                 from arch/mips/kernel/syscall.c:300,
                 from arch/mips/kernel/signal.c:853,
                 from arch/mips/kernel/setup.c:1030,
                 from arch/mips/kernel/reset.c:354,
                 from arch/mips/kernel/ptrace.c:562,
                 from arch/mips/kernel/process.c:770,
                 from arch/mips/kernel/irq.c:350,
                 from arch/mips/kernel/branch.c:321,
                 from arch/mips/kernel/cpu-probe.c:1370,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:345,
                 from arch/mips/sgi-ip22/ip22-gio.c:660,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/sgialib.h:219,
                 from arch/mips/sgi-ip22/ip22-reset.c:224,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/paccess.h:116,
                 from arch/mips/sgi-ip22/ip22-nvram.c:334,
                 from include/linux/kernel_stat.h:79,
                 from arch/mips/sgi-ip22/ip22-int.c:592,
                 from arch/mips/sgi-ip22/ip22-hpc.c:470,
                 from arch/mips/sgi-ip22/ip22-mc.c:135,
                 from init/init_task.c:54,
                 from init/calibrate.c:744,
                 from init/noinitramfs.c:62,
                 from init/do_mounts.c:573,
                 from init/version.c:1009,
                 from init/main.c:777,
                 from :729:
arch/mips/mm/tlbex.c:1450:5: note: previously declared here
In file included from arch/mips/kernel/topology.c:604:0,
                 from arch/mips/kernel/time.c:212,
                 from arch/mips/kernel/syscall.c:300,
                 from arch/mips/kernel/signal.c:853,
                 from arch/mips/kernel/setup.c:1030,
                 from arch/mips/kernel/reset.c:354,
                 from arch/mips/kernel/ptrace.c:562,
                 from arch/mips/kernel/process.c:770,
                 from arch/mips/kernel/irq.c:350,
                 from arch/mips/kernel/branch.c:321,
                 from arch/mips/kernel/cpu-probe.c:1370,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:345,
                 from arch/mips/sgi-ip22/ip22-gio.c:660,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/sgialib.h:219,
                 from arch/mips/sgi-ip22/ip22-reset.c:224,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/paccess.h:116,
                 from arch/mips/sgi-ip22/ip22-nvram.c:334,
                 from include/linux/kernel_stat.h:79,
                 from arch/mips/sgi-ip22/ip22-int.c:592,
                 from arch/mips/sgi-ip22/ip22-hpc.c:470,
                 from arch/mips/sgi-ip22/ip22-mc.c:135,
                 from init/init_task.c:54,
                 from init/calibrate.c:744,
                 from init/noinitramfs.c:62,
                 from init/do_mounts.c:573,
                 from init/version.c:1009,
                 from init/main.c:777,
                 from :729:
arch/mips/kernel/traps.c:64:49: error: variable ‘handle_tlbs’ redeclared as function
In file included from arch/mips/mm/page.c:310:0,
                 from arch/mips/mm/mmap.c:208,
                 from arch/mips/mm/init.c:641,
                 from arch/mips/mm/gup.c:811,
                 from arch/mips/mm/fault.c:659,
                 from include/linux/module.h:682,
                 from arch/mips/mm/dma-default.c:161,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:397,
                 from arch/mips/kernel/i8253.c:538,
                 from arch/mips/kernel/proc.c:145,
                 from arch/mips/kernel/irq_cpu.c:129,
                 from arch/mips/kernel/i8259.c:229,
                 from include/uapi/linux/elf.h:251,
                 from arch/mips/kernel/mips_ksyms.c:129,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/time.h:50,
                 from arch/mips/kernel/cevt-r4k.c:90,
                 from arch/mips/kernel/vdso.c:136,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:351,
                 from arch/mips/kernel/unaligned.c:809,
                 from arch/mips/kernel/traps.c:1720,
                 from arch/mips/kernel/topology.c:684,
                 from arch/mips/kernel/time.c:212,
                 from arch/mips/kernel/syscall.c:300,
                 from arch/mips/kernel/signal.c:853,
                 from arch/mips/kernel/setup.c:1030,
                 from arch/mips/kernel/reset.c:354,
                 from arch/mips/kernel/ptrace.c:562,
                 from arch/mips/kernel/process.c:770,
                 from arch/mips/kernel/irq.c:350,
                 from arch/mips/kernel/branch.c:321,
                 from arch/mips/kernel/cpu-probe.c:1370,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/thread_info.h:345,
                 from arch/mips/sgi-ip22/ip22-gio.c:660,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/sgialib.h:219,
                 from arch/mips/sgi-ip22/ip22-reset.c:224,
                 from /fluff/home/ralf/src/linux/lto/linux-misc/arch/mips/include/asm/paccess.h:116,
                 from arch/mips/sgi-ip22/ip22-nvram.c:334,
                 from include/linux/kernel_stat.h:79,
                 from arch/mips/sgi-ip22/ip22-int.c:592,
                 from arch/mips/sgi-ip22/ip22-hpc.c:470,
                 from arch/mips/sgi-ip22/ip22-mc.c:135,
                 from init/init_task.c:54,
                 from init/calibrate.c:744,
                 from init/noinitramfs.c:62,
                 from init/do_mounts.c:573,
                 from init/version.c:1009,
                 from init/main.c:777,
                 from :729:
arch/mips/mm/tlbex.c:1449:5: note: previously declared here
lto1: fatal error: errors during merging of translation units
compilation terminated.
lto-wrapper: /usr/bin/mips-linux-gcc returned 1 exit status
/usr/lib64/gcc/mips-linux/4.7.1/../../../../mips-linux/bin/ld: lto-wrapper failed
collect2: error: ld returned 1 exit status
make: *** [vmlinux] Error 1
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

With LTE this fixes this issue:

  LDFINAL vmlinux.o
arch/mips/built-in.o (symbol from plugin): In function `sgimc_init':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
kernel/built-in.o (symbol from plugin): In function `get_task_mm':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
mm/built-in.o (symbol from plugin): In function `iov_iter_single_seg_count':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
fs/built-in.o (symbol from plugin): In function `finish_no_open':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
ipc/built-in.o (symbol from plugin): In function `ipc_init_ids':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
security/built-in.o (symbol from plugin): In function `key_schedule_gc':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
crypto/built-in.o (symbol from plugin): In function `crypto_find_alg':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
block/built-in.o (symbol from plugin): In function `elv_rb_find':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
argv_split.o (symbol from plugin): In function `argv_free':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
dec_and_lock.o (symbol from plugin): In function `_atomic_dec_and_lock':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
extable.o (symbol from plugin): In function `sort_extable':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
flex_proportions.o (symbol from plugin): In function `fprop_global_init':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
idr.o (symbol from plugin): In function `idr_for_each':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
is_single_threaded.o (symbol from plugin): In function `current_is_single_threaded':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
kobject.o (symbol from plugin): In function `kobject_get':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
kobject_uevent.o (symbol from plugin): In function `add_uevent_var':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
plist.o (symbol from plugin): In function `plist_add':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
radix-tree.o (symbol from plugin): In function `radix_tree_lookup_slot':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
ratelimit.o (symbol from plugin): In function `___ratelimit':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
rwsem-spinlock.o (symbol from plugin): In function `__init_rwsem':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
show_mem.o (symbol from plugin): In function `show_mem':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
timerqueue.o (symbol from plugin): In function `timerqueue_iterate_next':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
vsprintf.o (symbol from plugin): In function `simple_strtoull':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
delay.o (symbol from plugin): In function `__delay':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
mips-atomic.o (symbol from plugin): In function `arch_local_irq_disable':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
uncached.o (symbol from plugin): In function `run_uncached':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
lib/built-in.o (symbol from plugin): In function `_bcd2bin':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
arch/mips/lib/built-in.o (symbol from plugin): In function `ioread8':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
drivers/built-in.o (symbol from plugin): In function `fb_notifier_call_chain':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
net/built-in.o (symbol from plugin): In function `sock_from_file':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here
klist.o (symbol from plugin): In function `klist_init':
(.text+0x0): multiple definition of `$28'
init/built-in.o (symbol from plugin):(.text+0x0): first defined here

It also makes the code a little more readable, so let's merge it.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

With the addition of transparent huge pages, pgtable.h uses struct page.
However, it is possible to include pgtable.h without anything defining
struct page.  So add the include to get it.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

All synthesizable CPU cores that could be loaded into a SEAD3's FPGA are
MIPS32 or MIPS64 CPUs that have ll/sc.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Commit f7ade3c1 ("MIPS: Get rid of
CONFIG_CPU_HAS_LLSC") did what it promised to do. But since then that
macro and its Kconfig symbol popped up again. Get rid of those again.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Cc: Jonas Gorski <jogo@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/4978/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

The MIPS implementation of transparent huge-pages (THP) is 64-bit only,
and of course also requires that the CPU supports huge-pages.

Currently it's entirely possible to enable THP in other configurations,
which then fail to build due to pfn_pmd() not being defined.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: linux-mips@linux-mips.org
Acked-by: David Daney <david.daney@cavium.com>
Patchwork: https://patchwork.linux-mips.org/patch/4972/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/4963/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

commit 92d11594 (MIPS: Remove irqflags.h dependency from bitops.h)
factored some of the bitops code out into a separate file
(arch/mips/lib/bitops.c).  Unfortunately the logic converting a bit
mask into a boolean result was lost in some of the functions.  We had:

   int res;
   unsigned long shifted_result_bit;
   .
   .
   .
   res = shifted_result_bit;
   return res;

Which truncates off the high 32 bits (thus yielding an incorrect
value) on 64-bit systems.

The manifestation of this is that a non-SMP 64-bit kernel will not
boot as the bitmap operations in bootmem.c are all screwed up.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc:  linux-mips@linux-mips.org
Cc: Jim Quinlan <jim2101024@gmail.com>
Cc: stable@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/4965/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

The csum_partial implementation contain optimalizations for the MIPS R2
instruction set. This optimization is never enabled however because the
if directive uses the CPU_MIPSR2 constant which is not defined anywhere.

Use the CONFIG_CPU_MIPSR2 constant instead.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/4971/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

The pains for multiplexed syscalls.

Noticed by Al Viro <viro@zeniv.linux.org.uk>.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Pull namespace bugfixes from Eric Biederman:
 "This is three simple fixes against 3.9-rc1.  I have tested each of
  these fixes and verified they work correctly.

  The userns oops in key_change_session_keyring and the BUG_ON triggered
  by proc_ns_follow_link were found by Dave Jones.

  I am including the enhancement for mount to only trigger requests of
  filesystem modules here instead of delaying this for the 3.10 merge
  window because it is both trivial and the kind of change that tends to
  bit-rot if left untouched for two months."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  proc: Use nd_jump_link in proc_ns_follow_link
  fs: Limit sys_mount to only request filesystem modules (Part 2).
  fs: Limit sys_mount to only request filesystem modules.
  userns: Stop oopsing in key_change_session_keyring

There is a more complete atmel patch-series out by Nick Dyer that fixes
this and other things, but in the meantime this is the minimal thing to
get the touchscreen going on (at least my) Pixel Chromebook.

Not that I want my dirty fingers near that beautiful screen, but it
seems that a non-initialized touchscreen will also end up being a
constant wakeup source, so you have to disable it to go to sleep.  And
it's easier to just fix the initialization sequence.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Update proc_ns_follow_link to use nd_jump_link instead of just
manually updating nd.path.dentry.

This fixes the BUG_ON(nd->inode != parent->d_inode) reported by Dave
Jones and reproduced trivially with mkdir /proc/self/ns/uts/a.

Sigh it looks like the VFS change to require use of nd_jump_link
happend while proc_ns_follow_link was baking and since the common case
of proc_ns_follow_link continued to work without problems the need for
making this change was overlooked.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

Pull btrfs fixes from Chris Mason:
 "These are scattered fixes and one performance improvement.  The
  biggest functional change is in how we throttle metadata changes.  The
  new code bumps our average file creation rate up by ~13% in fs_mark,
  and lowers CPU usage.

  Stefan bisected out a regression in our allocation code that made
  balance loop on extents larger than 256MB."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: improve the delayed inode throttling
  Btrfs: fix a mismerge in btrfs_balance()
  Btrfs: enforce min_bytes parameter during extent allocation
  Btrfs: allow running defrag in parallel to administrative tasks
  Btrfs: avoid deadlock on transaction waiting list
  Btrfs: do not BUG_ON on aborted situation
  Btrfs: do not BUG_ON in prepare_to_reloc
  Btrfs: free all recorded tree blocks on error
  Btrfs: build up error handling for merge_reloc_roots
  Btrfs: check for NULL pointer in updating reloc roots
  Btrfs: fix unclosed transaction handler when the async transaction commitment fails
  Btrfs: fix wrong handle at error path of create_snapshot() when the commit fails
  Btrfs: use set_nlink if our i_nlink is 0

Add basic platform data to get the current upstream driver working
with the 224s touchpad and 1664s touchscreen.
We will be using NULL config so we will use the settings from the
devices' NVRAMs.
Signed-off-by: Benson Leung <bleung@chromium.org>
Tested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This same driver can be used by atmel based touchscreens and touchpads
(buttonpads). Platform data may specify a device is a touchpad
using the is_tp flag.

This will cause the driver to perform some touchpad specific
initializations, such as:
  * register input device name "Atmel maXTouch Touchpad" instead of
  Touchscreen.
  * register BTN_LEFT & BTN_TOOL_* event types.
  * register axis resolution (as a fixed constant, for now)
  * register BUTTONPAD property
  * process GPIO buttons using reportid T19

Input event GPIO mapping is done by the platform data key_map array.

key_map[x] should contain the KEY or BTN code to send when processing
GPIOx from T19. To specify a GPIO as not an input source, populate
with KEY_RESERVED, or 0.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Tested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull CIFS fixes from Steve French:
 "A small set of cifs fixes which includes one for a recent regression
  in the write path (pointed out by Anton), some fixes for rename
  problems and as promised for 3.9 removing the obsolete sockopt mount
  option (and the accompanying deprecation warning)."

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
  CIFS: Fix missing of oplock_read value in smb30_values structure
  cifs: don't try to unlock pagecache page after releasing it
  cifs: remove the sockopt= mount option
  cifs: Check server capability before attempting silly rename
  cifs: Fix bug when checking error condition in cifs_rename_pending_delete()

Merge misc fixes from Andrew Morton.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  alpha: boot: fix build breakage introduced by system.h disintegration
  memcg: initialize kmem-cache destroying work earlier
  Randy has moved
  ksm: fix m68k build: only NUMA needs pfn_to_nid
  dmi_scan: fix missing check for _DMI_ signature in smbios_present()
  Revert parts of "hlist: drop the node parameter from iterators"
  idr: remove WARN_ON_ONCE() on negative IDs
  mm/mempolicy.c: fix sp_node_init() argument ordering
  mm/mempolicy.c: fix wrong sp_node insertion
  ipc: don't allocate a copy larger than max
  ipc: fix potential oops when src msg > 4k w/ MSG_COPY

Commit ec221208 ("Disintegrate asm/system.h for Alpha") removed the
system.h include from boot/head.S, which puts the PAL_* asm constants
out of scope.

Include <asm/pal.h> so we can get building again.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: David Rusling <david.rusling@linaro.org>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Fix a warning from lockdep caused by calling cancel_work_sync() for
uninitialized struct work.  This path has been triggered by destructon
kmem-cache hierarchy via destroying its root kmem-cache.

  cache ffff88003c072d80
  obj ffff88003b410000 cache ffff88003c072d80
  obj ffff88003b924000 cache ffff88003c20bd40
  INFO: trying to register non-static key.
  the code is fine but needs lockdep annotation.
  turning off the locking correctness validator.
  Pid: 2825, comm: insmod Tainted: G           O 3.9.0-rc1-next-20130307+ #611
  Call Trace:
    __lock_acquire+0x16a2/0x1cb0
    lock_acquire+0x8a/0x120
    flush_work+0x38/0x2a0
    __cancel_work_timer+0x89/0xf0
    cancel_work_sync+0xb/0x10
    kmem_cache_destroy_memcg_children+0x81/0xb0
    kmem_cache_destroy+0xf/0xe0
    init_module+0xcb/0x1000 [kmem_test]
    do_one_initcall+0x11a/0x170
    load_module+0x19b0/0x2320
    SyS_init_module+0xc6/0xf0
    system_call_fastpath+0x16/0x1b

Example module to demonstrate:

  #include <linux/module.h>
  #include <linux/slab.h>
  #include <linux/mm.h>
  #include <linux/workqueue.h>

  int __init mod_init(void)
  {
  	int size = 256;
  	struct kmem_cache *cache;
  	void *obj;
  	struct page *page;

  	cache = kmem_cache_create("kmem_cache_test", size, size, 0, NULL);
  	if (!cache)
  		return -ENOMEM;

  	printk("cache %p\n", cache);

  	obj = kmem_cache_alloc(cache, GFP_KERNEL);
  	if (obj) {
  		page = virt_to_head_page(obj);
  		printk("obj %p cache %p\n", obj, page->slab_cache);
  		kmem_cache_free(cache, obj);
  	}

  	flush_scheduled_work();

  	obj = kmem_cache_alloc(cache, GFP_KERNEL);
  	if (obj) {
  		page = virt_to_head_page(obj);
  		printk("obj %p cache %p\n", obj, page->slab_cache);
  		kmem_cache_free(cache, obj);
  	}

  	kmem_cache_destroy(cache);

  	return -EBUSY;
  }

  module_init(mod_init);
  MODULE_LICENSE("GPL");
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Glauber Costa <glommer@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Update email address and CREDITS info.  xenotime.net is defunct.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Harry Wei <harryxiyou@gmail.com>
Cc: Keiichi KII <k-keiichi@bx.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

A CONFIG_DISCONTIGMEM=y m68k config gave

  mm/ksm.c: In function `get_kpfn_nid':
  mm/ksm.c:492: error: implicit declaration of function `pfn_to_nid'

linux/mmzone.h declares it for CONFIG_SPARSEMEM and CONFIG_FLATMEM, but
expects the arch's asm/mmzone.h to declare it for CONFIG_DISCONTIGMEM
(see arch/mips/include/asm/mmzone.h for example).

Or perhaps it is only expected when CONFIG_NUMA=y: too much of a maze,
and m68k got away without it so far, so fix the build in mm/ksm.c.
Signed-off-by: Hugh Dickins <hughd@google.com>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Petr Holasek <pholasek@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit 9f9c9cbb ("drivers/firmware/dmi_scan.c: fetch dmi version
from SMBIOS if it exists") hoisted the check for "_DMI_" into
dmi_scan_machine(), which means that we don't bother to check for
"_DMI_" at offset 16 in an SMBIOS entry.  smbios_present() may also call
dmi_present() for an address where we found "_SM_", if it failed further
validation.

Check for "_DMI_" in smbios_present() before calling dmi_present().

[akpm@linux-foundation.org: fix build]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Reported-by: Tim McGrath <tmhikaru@gmail.com>
Tested-by: Tim Mcgrath <tmhikaru@gmail.com>
Cc: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit b67bfe0d ("hlist: drop the node parameter from iterators")
did a lot of nice changes but also contains two small hunks that seem to
have slipped in accidentally and have no apparent connection to the
intent of the patch.

This reverts the two extraneous changes.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Peter Senna Tschudin <peter.senna@gmail.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

idr_find(), idr_remove() and idr_replace() used to silently ignore the
sign bit and perform lookup with the rest of the bits.  The weird behavior
has been changed such that negative IDs are treated as invalid.  As the
behavior change was subtle, WARN_ON_ONCE() was added in the hope of
determining who's calling idr functions with negative IDs so that they can
be examined for problems.

Up until now, all two reported cases are ID number coming directly from
userland and getting fed into idr_find() and the warnings seem to cause
more problems than being helpful.  Drop the WARN_ON_ONCE()s.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: <markus@trippelsdorf.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Currently, n_new is wrongly initialized.  start and end parameter are
inverted.  Let's fix it.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

n->end is accessed in sp_insert(). Thus it should be update
before calling sp_insert(). This mistake may make kernel panic.
Signed-off-by: Hillf Danton <dhillf@gmail.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Dave Jones <davej@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

When MSG_COPY is set, a duplicate message must be allocated for the copy
before locking the queue.  However, the copy could not be larger than was
sent which is limited to msg_ctlmax.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

If the src msg is > 4k, then dest->next points to the
next allocated segment; resetting it just prior to dereferencing
is bad.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull tile architecture fixes from Chris Metcalf:
 "This fixes the bug that Al Viro spotted with the compat llseek code.
  I also fixed the compat syscall definitions to use the new syscall
  define macros to properly sign-extend their arguments."

* 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
  tile: properly use COMPAT_SYSCALL_DEFINEx
  tile: work around bug in the generic sys_llseek

Pull metag bugfixes from James Hogan:
 "A couple of fairly minor arch/metag integration fixes from v3.9-rc1:

   - remove SET_PERSONALITY(): use default definition like other arches
     now do.

   - inhibit NUMA balancing: like SH, NUMA is used for memories with
     different latencies.  ARCH_WANT_VARIABLE_LOCALITY has been added
     for this purpose."

* tag 'metag-for-v3.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag:
  metag: Inhibit NUMA balancing.
  metag: remove SET_PERSONALITY()

Pull sound fixes from Takashi Iwai:
 "All are boring small fixes in various parts:
   - A few possible NULL-dereference or zero-division Oops fixes
   - Fix vmaster slave volume notification
   - Add codec ID for ALC233
   - Various fixes in several ASoC WM codecs
   - ASoC tegra i2c fix

  Sorry if you wanted a thrilling adventure with huge sharks :)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: ice1712: Initialize card->private_data properly
  ALSA: hda - Add support of new codec ALC233
  ALSA: hda/ca0132 - Avoid division by zero in dspxfr_one_seg()
  ALSA: hda - check NULL pointer when creating SPDIF PCM switch
  ALSA: hda - check NULL pointer when creating SPDIF controls
  ASoC: wm5102: Apply a SYSCLK patch for later revs
  ALSA: vmaster: Fix slave change notification
  ASoC: tegra: fix I2S bit count mask
  ALSA: seq: seq_oss_event: missing range checks
  ASoC: wm8350: Use jiffies rather than msecs in schedule_delayed_work()
  ASoC: wm5110: Correct OUT2/3 volume and switch names
  ASoC: wm5102: Correct OUT2 volume and switch names
  ASoC: wm8960: Fix ADC power bits
  ASoC: wm8960: Correct register 0 and 1 defaults

Pull HID fix from Jiri Kosina:
 "Bugfix for a long-standing bug in logitech-dj driver causing all sorts
  of random initialization problems, finally debugged by Benjamin
  Tissoires with help of Bob Bowles."

* 'for-3.9/upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
  HID: logitech-dj: do not directly call hid_output_raw_report() during probe

Pull random fixes from Ted Ts'o:
 "Fix a circular locking dependency in random's collection of cputime
  used by a thread when it exits."

* tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
  random: fix locking dependency with the tasklist_lock

It's "normal" - it can happen if the file descriptor you followed was
opened with O_NOFOLLOW.
Reported-by: Dave Jones <davej@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull x86 fixes from Peter Anvin:
 "Several boot fixes (MacBook, legacy EFI bootloaders), another
  please-don't-brick fix, and some minor stuff."

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: Do not try to sync identity map for non-mapped pages
  x86, doc: Be explicit about what the x86 struct boot_params requires
  x86: Don't clear efi_info even if the sentinel hits
  x86, mm: Make sure to find a 2M free block for the first mapped area
  x86: Fix 32-bit *_cpu_data initializers
  efivarfs: return accurate error code in efivarfs_fill_super()
  efivars: efivarfs_valid_name() should handle pstore syntax
  efi: be more paranoid about available space when creating variables
  iommu, x86: Add DMA remap fault reason
  x86, smpboot: Remove unused variable

Pull drm fixes from Dave Airlie:
 "Misc radeon, nouveau, mgag200 and intel fixes.

  The intel fixes should contain the fix for the touchpad on the
  Chromebook - hey I'm an input maintainer now!"

Hate to pee on your parade, Dave, but I don't think being an input
maintainer is necessarily something to strive for..

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (25 commits)
  drm/tegra: drop "select DRM_HDMI"
  drm: Documentation typo fixes
  drm/mgag200: Bug fix: Renesas board now selects native resolution.
  drm/mgag200: Reject modes that are too big for VRAM
  drm/mgag200: 'fbdev_list' in 'struct mga_fbdev' is not used
  drm/radeon: don't check mipmap alignment if MIP_ADDRESS is FMASK
  drm/radeon: skip MC reset as it's probably not hung
  drm/radeon: add primary dac adj quirk for R200 board
  drm/radeon: don't set hpd, afmt interrupts when interrupts are disabled
  drm/i915: Turn off hsync and vsync on ADPA when disabling crt
  drm/i915: Fix incorrect definition of ADPA HSYNC and VSYNC bits
  drm/i915: also disable south interrupts when handling them
  drm/i915: enable irqs earlier when resuming
  drm/i915: Increase the RC6p threshold.
  DRM/i915: On G45 enable cursor plane briefly after enabling the display plane.
  drm/nv50-: prevent some races between modesetting and page flipping
  drm/nouveau/i2c: drop parent refcount when creating ports
  drm/nv84: fix regression in page flipping
  drm/nouveau: Fix typo in init_idx_addr_latched().
  drm/nouveau: Disable AGP on PowerPC again.
  ...

Pull ACPI and power management fixes from Rafael J Wysocki:

 - Two fixes for the new intel_pstate driver from Dirk Brandewie.

 - Fix for incorrect usage of the .find_bridge() callback from struct
   acpi_bus_type in the USB core and subsequent removal of that callback
   from Rafael J Wysocki.

 - ACPI processor driver cleanups from Chen Gang and Syam Sidhardhan.

 - ACPI initialization and error messages fix from Joe Perches.

 - Operating Performance Points documentation improvement from Nishanth
   Menon.

 - Fixes for memory leaks and potential concurrency issues and sysfs
  attributes leaks during device removal in the core device PM QoS code
  from Rafael J Wysocki.

 - Calxeda Highbank cpufreq driver simplification from Emilio López.

 - cpufreq comment cleanup from Namhyung Kim.

 - Fix for a section mismatch in Calxeda Highbank interprocessor
   communication code from Mark Langsdorf (this is not a PM fix strictly
   speaking, but the code in question went in through the PM tree).

* tag 'pm+acpi-3.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq / intel_pstate: Do not load on VM that does not report max P state.
  cpufreq / intel_pstate: Fix intel_pstate_init() error path
  ACPI / glue: Drop .find_bridge() callback from struct acpi_bus_type
  ACPI / glue: Add .match() callback to struct acpi_bus_type
  ACPI / porocessor: Beautify code, pr->id is u32 which is never < 0
  ACPI / processor: Remove redundant NULL check before kfree
  ACPI / Sleep: Avoid interleaved message on errors
  PM / QoS: Remove device PM QoS sysfs attributes at the right place
  PM / QoS: Fix concurrency issues and memory leaks in device PM QoS
  cpufreq: highbank: do not initialize array with a loop
  PM / OPP: improve introductory documentation
  cpufreq: Fix a typo in comment
  mailbox, pl320-ipc: remove __init from probe function

Commit ac24c220 ("drm/tegra: Use generic
HDMI infoframe helpers") added "select DRM_HDMI" to the DRM_TEGRA
Kconfig entry. But there is no Kconfig symbol named DRM_HDMI. The select
statement for that symbol is a nop. Drop it.

What was needed to use HDMI functionality was to select HDMI (which this
entry already did through depending on DRM) and to include linux/hdmi.h
(which this commit also did).
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Acked-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>