s390/ap_bus: Make modules parameters visible in sysfs

Change the visibility of the module parameters ap_domain_index and
ap_thread_flag for the owner and the members of the owners group in
sysfs.

Previously the parameters where invisible due to a value of zero
as permissions parameter in the module_param_named macro.

Signed-off-by: Michael Veigel <veigel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/uaccess: always load the kernel ASCE after task switch

This patch fixes a problem introduced with git commit beef560b4cdfafb2
"s390/uaccess: simplify control register updates".

The switch_mm function is not called if the next process is a kernel
thread without an attached mm or is a nop if the mm does not change.
But CR1 still needs to be loaded with the kernel ASCE in case the
code returns to a uaccess function that uses the secondary space mode.

In addition move the set_fs call from finish_arch_switch to
finish_arch_post_lock_switch and then remove finish_arch_switch.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/cio: silence lockdep warning

On systems where a ccw based console device is used a lockdep false alarm
could be triggered when a device driver calls printk while holding a
subchannels lock (e.g. in it's irq handler). Since this is valid behavior
fix this by introducing a separate lock class for the console subchannels
lock.

The lockdep warning was revealed by "printk: enable interrupts before calling
console_trylock_for_printk()" which changed console_unlock() to be called with
lockdep enabled.

[ INFO: possible recursive locking detected ]
3.15.0-rc5-next-20140520 #1 Not tainted
---------------------------------------------
ccwgroup/2239 is trying to acquire lock:
(&(sch->lock)->rlock){-.-...}, at: [<0000000000642a52>] raw3215_write+0x52/0x200

but task is already holding lock:
(&(sch->lock)->rlock){-.-...}, at: [<00000000005fd160>] do_cio_interrupt+0x60/0x108

other info that might help us debug this:
Possible unsafe locking scenario:

CPU0
----
lock(&(sch->lock)->rlock);
lock(&(sch->lock)->rlock);

*** DEADLOCK ***

May be due to missing lock nesting notation

8 locks held by ccwgroup/2239:

stack backtrace:
CPU: 3 PID: 2239 Comm: ccwgroup Not tainted 3.15.0-rc5-next-20140520 #1
0000000036fab518 0000000036fab528 0000000000000002 0000000000000000
0000000036fab5b8 0000000036fab530 0000000036fab530 00000000001116e8
0000000000000000 0000000000986ec4 00000000009701b6 000000000000000b
0000000036fab578 0000000036fab518 0000000000000000 0000000000000000
0000000000000000 00000000001116e8 0000000036fab518 0000000036fab578
Call Trace:
([<0000000000111626>] show_trace+0x14e/0x158)
[<000000000011169a>] show_stack+0x6a/0xe8
[<00000000007c6e72>] dump_stack+0x82/0xb0
[<00000000001a95f2>] validate_chain.isra.37+0xa4a/0xbb0
[<00000000001acaca>] __lock_acquire+0x4da/0xcd0
[<00000000001ada1a>] lock_acquire+0xba/0x218
[<00000000007cd634>] _raw_spin_lock_irqsave+0x6c/0xb8
[<0000000000642a52>] raw3215_write+0x52/0x200
[<0000000000643d16>] con3215_write+0x76/0xf8
[<00000000001bd87a>] call_console_drivers.constprop.25+0xfa/0x210
[<00000000001be0b0>] console_unlock+0x3e0/0x4e8
[<00000000001be450>] vprintk_emit+0x298/0x6e0
[<00000000005aa210>] dev_vprintk_emit+0xe0/0x1a8
[<00000000005aa320>] dev_printk_emit+0x48/0x50
[<00000000005aa390>] __dev_printk+0x68/0xb0
[<00000000005aa7c2>] _dev_info+0x62/0x70
[<0000000000657bf0>] qeth_l2_send_setmac_cb+0xd0/0x190
[<0000000000651a1e>] qeth_send_control_data_cb+0x3a6/0x6a8
[<0000000000655546>] qeth_irq+0x1a6/0xac0
[<000000000060a0ac>] ccw_device_call_handler+0xa4/0xc0
[<0000000000608b62>] ccw_device_irq+0x5a/0x190
[<00000000005fd1ca>] do_cio_interrupt+0xca/0x108
[<00000000001c0a2e>] handle_irq_event_percpu+0x5e/0x378
[<00000000001c46fc>] handle_percpu_irq+0x6c/0x98
[<00000000001c0066>] generic_handle_irq+0x46/0x68
[<000000000010b5b6>] do_IRQ+0x5e/0x88
[<00000000007cf304>] io_call+0x6/0x20
[<000000000064c63a>] qeth_send_control_data+0x322/0x570
([<000000000064c50e>] qeth_send_control_data+0x1f6/0x570)
[<0000000000651db2>] qeth_send_ipa_cmd+0x92/0x120
[<000000000065b310>] __qeth_l2_set_online+0x170/0xaa8
[<000000000060ebb6>] ccwgroup_set_online+0x56/0x90
[<000000000060ef96>] ccwgroup_online_store+0xd6/0xe0
[<000000000033d11a>] kernfs_fop_write+0x10a/0x188
[<00000000002bbd00>] vfs_write+0x98/0x1c0
[<00000000002bc8a0>] SyS_write+0x60/0xd0
[<00000000007cee3a>] sysc_nr_ok+0x22/0x28
[<000003fffd0c3f28>] 0x3fffd0c3f28

Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/qdio: replace shift loop by ilog2

account_sbals is called by get_inbound_buffer_frontier and
get_outbound_buffer_frontier with 'count' value > 0 so we can safely
convert shift loop to ilog2.

Cc: Joe Perches <joe@perches.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/sclp_vt220: Enable ASCII console per default

When you want to use the HMC's ASCII console as console device for
a z/VM guest you have to specify console=ttyS1 on the kernel command
line. But it won't work until you specify conmode=sclp as well.

This behavior is inconsistent with the use of the ASCII console as
TTY device which works on z/VM without the need to specify a conmode.

Fix this inconsistency by removing the check for conmode=sclp in the
ASCII console registration function.

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/watchdog: use watchdog API

Converted the vmwatchdog driver to use the kernel's watchdog API.

Signed-off-by: Philipp Hachtmann <phacht@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/watchdog: add support for LPAR operation (diag288)

Add the LPAR variant of the diag 288 watchdog to the driver.
The only available action on timeout for LPAR is a PSW restart.

Signed-off-by: Philipp Hachtmann <phacht@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/airq: silence lockdep warning

airq_iv_(alloc|free) is called by some users with interrupts enabled
and by some with interrupts disabled which leads to the following
lockdep warning:

[ INFO: possible irq lock inversion dependency detected ]
3.14.0-15249-gbf29b7b-dirty #25 Not tainted
---------------------------------------------------------
insmod/2108 just changed the state of lock:
 (&(&iv->lock)->rlock){+.....}, at: [<000000000046ee3e>] airq_iv_alloc+0x62/0x228
but this lock was taken by another, HARDIRQ-READ-safe lock in the past:
 (&info->lock){.-.-..}

and interrupts could create inverse lock ordering between them.

other info that might help us debug this:
 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&(&iv->lock)->rlock);
                               local_irq_disable();
                               lock(&info->lock);
                               lock(&(&iv->lock)->rlock);
  <Interrupt>
    lock(&info->lock);

 *** DEADLOCK ***

Although this is a false alarm (since each airq user consistently
calls these functions from the same context) fix this by ensuring
that interrupts are disabled when the airq lock is held.

Reported-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390: avoid format strings leaking into names

This makes sure format strings can't accidentally leak into kernel
interface names.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390: update default configuration

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/cio: set device name as early as possible

Currently we set the device name at the time we call device_add after
we receive the interrupt for the first I/O. When something is not working
as expected during that first I/O (e.g. we don't receive an interrupt) we
print a message including the device name which has not yet been
initialized.

Set the device name after calling device_initialize (prior to starting
the first I/O) so that we have the name present if some unexpected error
occurs during that first I/O.

Reported-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reported-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/compat: correct ucontext layout for high gprs

The uc_sigmask definition in the kernel differs from the one in the
glibc, the kernel uc_sigmask has 64 bits while the glibc verison
is 1024 bits. The extension of the ucontext structure for 64-bit
register support for 31-bit compat processes added a new field
uc_gprs_high which starts 8 bytes after the uc_sigmask field.
As the glibc view of the ucontext assumes a size of 128 bytes for
uc_sigmask add a 120 byte padding to the kernel structure
ucontext_extended after the 8 byte uc_sigmask.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
qdio: Keep device-specific dbf entries

Keep the per-device dbf entries until module is removed, with
proper error checking for debug feature setup.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Reviewed-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/ccwgroup: obtain extra reference for asynchronous processing

Commit 0b60f9ead5d4816e7e3d6e28f4a0d22d4a1b2513
"s390: use device_remove_file_self() instead of device_schedule_callback()"
changed ccwgroup to use an extra work queue instead of
device_schedule_callback. This function obtained an extra device
reference for its async work which is missing in the new implementation
and results in a "freeing memory with a lock still held" BUG. Fix
this by obtaining an extra reference for the async work.

Reported-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/ccwgroup: fix an uninitialized return code

Since commit 0b60f9ead5d4816e7e3d6e28f4a0d22d4a1b2513
"s390: use device_remove_file_self() instead of device_schedule_callback()"
the return code of ccwgroup_ungroup_store is uninitialized. Make
sure the rc is always initialized.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
s390/ccwgroup: use ccwgroup_ungroup wrapper

To ungroup and deregister the group device always use the
ccwgroup_ungroup wrapper.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/unicore32/kernel/ksyms.c: remove several undefined exported symbols

For 'csum_partial_copy_nocheck()', it has default definition in
'asm-generic'.

For '__raw_reads?()' and '__raw_writes?()' are used by the drivers
which no relationship with allmodconfig for unicode32, the related
modules are:

  drivers/mmc/host/omap.c
  drivers/mtd/nand/atmel_nand.c
  drivers/mtd/nand/pxa3xx_nand.c
  drivers/usb/gadget/at91_udc.c

Others are only within some architectures (not kernel wide).

The related error with allmodconfig for unicode32:

    CC      arch/unicore32/kernel/ksyms.o
  arch/unicore32/kernel/ksyms.c:29: error: ._backtrace. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:29: error: type defaults to .nt. in declaration of ._backtrace.
  arch/unicore32/kernel/ksyms.c:38: error: .sum_partial_copy_nocheck. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:38: error: type defaults to .nt. in declaration of .sum_partial_copy_nocheck.
  arch/unicore32/kernel/ksyms.c:39: error: ._csum_ipv6_magic. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:39: error: type defaults to .nt. in declaration of ._csum_ipv6_magic.
  arch/unicore32/kernel/ksyms.c:43: error: ._raw_readsb. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:43: error: type defaults to .nt. in declaration of ._raw_readsb.
  arch/unicore32/kernel/ksyms.c:46: error: ._raw_readsw. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:46: error: type defaults to .nt. in declaration of ._raw_readsw.
  arch/unicore32/kernel/ksyms.c:49: error: ._raw_readsl. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:49: error: type defaults to .nt. in declaration of ._raw_readsl.
  arch/unicore32/kernel/ksyms.c:52: error: ._raw_writesb. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:52: error: type defaults to .nt. in declaration of ._raw_writesb.
  arch/unicore32/kernel/ksyms.c:55: error: ._raw_writesw. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:55: error: type defaults to .nt. in declaration of ._raw_writesw.
  arch/unicore32/kernel/ksyms.c:58: error: ._raw_writesl. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:58: error: type defaults to .nt. in declaration of ._raw_writesl.
  arch/unicore32/kernel/ksyms.c:79: error: ._get_user_1. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:79: error: type defaults to .nt. in declaration of ._get_user_1.
  arch/unicore32/kernel/ksyms.c:80: error: ._get_user_2. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:80: error: type defaults to .nt. in declaration of ._get_user_2.
  arch/unicore32/kernel/ksyms.c:81: error: ._get_user_4. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:81: error: type defaults to .nt. in declaration of ._get_user_4.
  arch/unicore32/kernel/ksyms.c:83: error: ._put_user_1. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:83: error: type defaults to .nt. in declaration of ._put_user_1.
  arch/unicore32/kernel/ksyms.c:84: error: ._put_user_2. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:84: error: type defaults to .nt. in declaration of ._put_user_2.
  arch/unicore32/kernel/ksyms.c:85: error: ._put_user_4. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:85: error: type defaults to .nt. in declaration of ._put_user_4.
  arch/unicore32/kernel/ksyms.c:86: error: ._put_user_8. undeclared here (not in a function)
  arch/unicore32/kernel/ksyms.c:86: error: type defaults to .nt. in declaration of ._put_user_8.

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Acked-by: Xuetao Guan <gxt@mprc.pku.edu.cn>
Signed-off-by: Xuetao Guan <gxt@mprc.pku.edu.cn>
arch/unicore32/kernel/module.c: use __vmalloc_node_range() instead of __vmalloc_area()

__vmalloc_area() has already been removed from upstream kernel, need
use __vmalloc_node_range() instead of.

The related commit: "d0a2126 mm: unify module_alloc code for vmalloc".

The related error (allmodconfig for unicore32):

    CC      arch/unicore32/kernel/module.o
  arch/unicore32/kernel/module.c: In function 'module_alloc' :
  arch/unicore32/kernel/module.c:34: error: implicit declaration of function '__vmalloc_area'
  arch/unicore32/kernel/module.c:34: warning: return makes pointer from integer without a cast
  make[1]: *** [arch/unicore32/kernel/module.o] Error 1
  make: *** [arch/unicore32/kernel] Error 2

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Acked-by: Xuetao Guan <gxt@mprc.pku.edu.cn>
Signed-off-by: Xuetao Guan <gxt@mprc.pku.edu.cn>
arch/unicore32/kernel/clock.c: add readl() and writel() for 'PM_' macros

Add readl() and writel() for 'PM_' macros, just like another areas have
done within unicored32, or will cause compiling issue.

The related error (allmodconfig for unicored32):

    CC      arch/unicore32/kernel/clock.o
  arch/unicore32/kernel/clock.c: In function 'clk_set_rate':
  arch/unicore32/kernel/clock.c:182: warning: initialization makes integer from pointer without a cast
  arch/unicore32/kernel/clock.c:204: error: lvalue required as left operand of assignment
  arch/unicore32/kernel/clock.c:206: error: lvalue required as left operand of assignment
  arch/unicore32/kernel/clock.c:207: error: invalid operands to binary & (have 'void *' and 'long unsigned int')
  make[1]: *** [arch/unicore32/kernel/clock.o] Error 1
  make: *** [arch/unicore32/kernel] Error 2

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Acked-by: Xuetao Guan <gxt@mprc.pku.edu.cn>
Signed-off-by: Xuetao Guan <gxt@mprc.pku.edu.cn>
arch/unicore32/mm/alignment.c: include "asm/pgtable.h" to avoid compiling error

Need include "asm/pgtable.h" to include "asm-generic/pgtable-nopmd.h",
so can let 'pmd_t' defined. The related error with allmodconfig:

    CC      arch/unicore32/mm/alignment.o
  In file included from arch/unicore32/mm/alignment.c:24:
  arch/unicore32/include/asm/tlbflush.h:135: error: expected .). before .*. token
  arch/unicore32/include/asm/tlbflush.h:154: error: expected .). before .*. token
  In file included from arch/unicore32/mm/alignment.c:27:
  arch/unicore32/mm/mm.h:15: error: expected .=., .,., .;., .sm. or ._attribute__. before .*. token
  arch/unicore32/mm/mm.h:20: error: expected .=., .,., .;., .sm. or ._attribute__. before .*. token
  arch/unicore32/mm/mm.h:25: error: expected .=., .,., .;., .sm. or ._attribute__. before .*. token
  make[1]: *** [arch/unicore32/mm/alignment.o] Error 1
  make: *** [arch/unicore32/mm] Error 2

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Acked-by: Xuetao Guan <gxt@mprc.pku.edu.cn>
Signed-off-by: Xuetao Guan <gxt@mprc.pku.edu.cn>