linux-toradex.git/arch/s390/kernel, branch v3.10.41

s390: fix kernel crash due to linkage stack instructions

2014-02-22T20:41:26+00:00

commit 8d7f6690cedb83456edd41c9bd583783f0703bf0 upstream.

The kernel currently crashes with a low-address-protection exception
if a user space process executes an instruction that tries to use the
linkage stack. Set the base-ASTE origin and the subspace-ASTE origin
of the dispatchable-unit-control-table to point to a dummy ASTE.
Set up control register 15 to point to an empty linkage stack with no
room left.

A user space process with a linkage stack instruction will still crash
but with a different exception which is correctly translated to a
segmentation fault instead of a kernel oops.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Greg Kroah-Hartman

s390/vtime: correct idle time calculation

2013-11-29T19:11:53+00:00

commit 4560e7c3317c7a2b370e36dadd3a3bac2ed70818 upstream.

Use the ACCESS_ONCE macro for both accesses to idle->sequence in the
loops to calculate the idle time. If only one access uses the macro,
the compiler is free to cache the value for the second access which
can cause endless loops.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Greg Kroah-Hartman

s390: fix system call restart after inferior call

2013-10-13T23:08:34+00:00

commit dbbfe487e5f3fc00c9fe5207d63309859704d12f upstream.

Git commit 616498813b11ffef "s390: system call path micro optimization"
introduced a regression in regard to system call restarting and inferior
function calls via the ptrace interface. The pointer to the system call
table needs to be loaded in sysc_sigpending if do_signal returns with
TIF_SYSCALl set after it restored a system call context.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Greg Kroah-Hartman

s390: add support for IBM zBC12 machine

2013-08-12T01:35:25+00:00

commit 594712276e737961d30e11eae80d403b2b3815df upstream.

Just add the new model number where appropiate.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky 
Signed-off-by: Greg Kroah-Hartman

s390/ipl: Fix FCP WWPN and LUN format strings for read

2013-06-24T09:16:34+00:00

The following git commit changed the behavior of sscanf:

commit 53809751ac230a3611b5cdd375f3389f3207d471
Author: Jan Beulich 
Date:   Mon Dec 17 16:01:31 2012 -0800
    sscanf: don't ignore field widths for numeric conversions

This broke the WWPN and LUN sysfs attributes for s390 reipl and dump
on panic.

Example:

$ echo 0x0123456701234567 > /sys/firmware/reipl/fcp/wwpn
$ cat /sys/firmware/reipl/fcp/wwpn
0x0001234567012345

So fix this and use format strings that work also with the
new sscanf implementation:

$ echo 0x012345670123456789 > /sys/firmware/reipl/fcp/wwpn
$ cat /sys/firmware/reipl/fcp/wwpn
0x0123456701234567

Cc: stable@vger.kernel.org # 3.8+
Reviewed-by: Steffen Maier 
Signed-off-by: Michael Holzheu 
Signed-off-by: Martin Schwidefsky

s390/irq: Only define synchronize_irq() on SMP

2013-06-19T07:25:41+00:00

In uniprocessor configurations, synchronize_irq() is defined in
 as a macro, and this function definition fails to
compile.

Reported-by: kbuild test robot 
Signed-off-by: Ben Hutchings 
Cc: stable@vger.kernel.org # 3.9
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/pci: Implement IRQ functions if !PCI

2013-06-10T14:06:04+00:00

All architectures must implement IRQ functions.  Since various
dependencies on !S390 were removed, there are various drivers that can
be selected but will fail to link.  Provide a dummy implementation of
these functions for the !PCI case.

Signed-off-by: Ben Hutchings 
Cc: stable@vger.kernel.org # 3.9
Acked-by: David S. Miller 
Signed-off-by: Martin Schwidefsky

s390/sclp: fix new line detection

2013-06-05T15:36:21+00:00

When printing multi-line text using sclp_print, line endings are not
correctly handled. The routine is expecting an EBCDIC new line character
as line terminator while the input text is encoded in ASCII format.

Fix this problem by modifying sclp_print to scan for ASCII new line
characters.

Signed-off-by: Peter Oberparleiter 
Signed-off-by: Martin Schwidefsky

s390/dumpstack: fix address ranges for asynchronous and panic stack

2013-06-05T15:36:20+00:00

git commit dc7ee00d4771b321 "s390: lowcore stack pointer offsets"
introduced a regression in regard to show_stack(). The stack pointer
for the asynchronous and the panic stack in the lowcore now have an
additional offset applied to them. This offset needs to be taken into
account in the calculation for the low and high address for the stacks.

Signed-off-by: Martin Schwidefsky

s390/smp: lost IPIs on cpu hotplug

2013-05-27T07:16:15+00:00

IPIs might be lost when a cpu gets brought offline:

When stop_machine executes its state machine there is a race window
for the state STOPMACHINE_DISABLE_IRQ where the to be brought offline
cpu might already have irqs disabled but a different cpu still may
have irqs enabled.
If the enabled cpu receives an interrupt and as a result sends an IPI
to the to be offlined cpu in its bottom halve context, the IPI won't
be noticed before the cpu is offline.

In fact the race window is much larger since there is no guarantee
when an IPI will be received.

To fix this check for enqueued but not yet received IPIs in the
cpu_disable() path and call the respective handlers before the cpu
is marked offline.

Reported-by: Juergen Doelle 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky