linux-toradex.git/arch/s390/Kconfig, branch v3.2

[S390] Kconfig: Select CONFIG_KEXEC for CONFIG_CRASH_DUMP

2011-11-14T10:19:08+00:00

The kdump infrastructure is built on top of kexec. Therefore
CONFIG_KEXEC has to be enabled when CONFIG_CRASH_DUMP is selected.

Signed-off-by: Michael Holzheu 
Signed-off-by: Martin Schwidefsky

[S390] kdump backend code

2011-10-30T14:16:42+00:00

This patch provides the architecture specific part of the s390 kdump
support.

Signed-off-by: Michael Holzheu 
Signed-off-by: Martin Schwidefsky

PM / Hibernate: Include storage keys in hibernation image on s390

2011-10-16T21:27:46+00:00

For s390 there is one additional byte associated with each page,
the storage key. This byte contains the referenced and changed
bits and needs to be included into the hibernation image.
If the storage keys are not restored to their previous state all
original pages would appear to be dirty. This can cause
inconsistencies e.g. with read-only filesystems.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Rafael J. Wysocki

Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6

2011-08-04T16:35:51+00:00

* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
  [S390] signal: use set_restore_sigmask() helper
  [S390] smp: remove pointless comments in startup_secondary()
  [S390] qdio: Use kstrtoul_from_user
  [S390] sclp_async: Use kstrtoul_from_user
  [S390] exec: remove redundant set_fs(USER_DS)
  [S390] cpu hotplug: on cpu start wait until being marked active
  [S390] signal: convert to use set_current_blocked()
  [S390] asm offsets: fix coding style
  [S390] Add support for IBM zEnterprise 114
  [S390] dasd: check if raw track access is supported
  [S390] Use diagnose 308 for system reset
  [S390] Export store_status() function
  [S390] dasd: use vmalloc for statistics input buffer
  [S390] Add PSW restart shutdown trigger
  [S390] missing return in page_table_alloc_pgste
  [S390] qdio: 2nd stage retry on SIGA-W busy conditions

Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHG

2011-08-03T15:12:37+00:00

cmpxchg() is widely used by lockless code, including NMI-safe lockless
code.  But on some architectures, the cmpxchg() implementation is not
NMI-safe, on these architectures the lockless code may need a
spin_trylock_irqsave() based implementation.

This patch adds a Kconfig option: ARCH_HAVE_NMI_SAFE_CMPXCHG, so that
NMI-safe lockless code can depend on it or provide different
implementation according to it.

On many architectures, cmpxchg is only NMI-safe for several specific
operand sizes. So, ARCH_HAVE_NMI_SAFE_CMPXCHG define in this patch
only guarantees cmpxchg is NMI-safe for sizeof(unsigned long).

Signed-off-by: Huang Ying 
Acked-by: Mike Frysinger 
Acked-by: Paul Mundt 
Acked-by: Hans-Christian Egtvedt 
Acked-by: Benjamin Herrenschmidt 
Acked-by: Chris Metcalf 
Acked-by: Richard Henderson 
CC: Mikael Starvik 
Acked-by: David Howells 
CC: Yoshinori Sato 
CC: Tony Luck 
CC: Hirokazu Takata 
CC: Geert Uytterhoeven 
CC: Michal Simek 
Acked-by: Ralf Baechle 
CC: Kyle McMartin 
CC: Martin Schwidefsky 
CC: Chen Liqin 
CC: "David S. Miller" 
CC: Ingo Molnar 
CC: Chris Zankel 
Signed-off-by: Len Brown

[S390] Add support for IBM zEnterprise 114

2011-08-03T14:44:20+00:00

Just fix up the Kconfig description and the elf platform.

Signed-off-by: Heiko Carstens

[S390] kvm-s390: fix kconfig dependencies

2011-06-22T14:24:19+00:00

A user can create the Kconfig combination !VIRTUALIZATION, S390_GUEST
which results in the following warnings:

warning: (S390_GUEST) selects VIRTIO which has unmet direct dependencies (VIRTUALIZATION)
warning: (S390_GUEST && VIRTIO_PCI && VIRTIO_BALLOON) selects VIRTIO_RING which has unmet direct dependencies (VIRTUALIZATION && VIRTIO)
warning: (S390_GUEST) selects VIRTIO which has unmet direct dependencies (VIRTUALIZATION)
warning: (S390_GUEST && VIRTIO_PCI && VIRTIO_BALLOON) selects VIRTIO_RING which has unmet direct dependencies (VIRTUALIZATION && VIRTIO)

S390_GUEST has to select VIRTUALIZATION before selecting VIRTIO and
friends.

Reported-by: Jan Glauber 
Signed-off-by: Christian Borntraeger 
Signed-off-by: Martin Schwidefsky

[S390] use generic RCU page-table freeing code

2011-06-06T12:14:56+00:00

Replace the s390 specific rcu page-table freeing code with the
generic variant. This requires to duplicate the definition for the
struct mmu_table_batch as s390 does not use the generic tlb flush
code.

While we are at it remove the restriction that page table fragments
can not be reused after a single fragment has been freed with rcu
and split out allocation and freeing of page tables with pgstes.

Signed-off-by: Martin Schwidefsky

[S390] mm: add ZONE_DMA to 31-bit config again

2011-05-26T07:48:25+00:00

Add ZONE_DMA to 31-bit config again. The performance gain is minimal
and hardly anybody cares anymore about a 31-bit kernel.
So add ZONE_DMA again to help with SLAB_CACHE_DMA removal for
!CONFIG_ZONE_DMA configurations.

Acked-by: David Rientjes 
Signed-off-by: Heiko Carstens

[S390] Remove data execution protection

2011-05-23T08:24:28+00:00

The noexec support on s390 does not rely on a bit in the page table
entry but utilizes the secondary space mode to distinguish between
memory accesses for instructions vs. data. The noexec code relies
on the assumption that the cpu will always use the secondary space
page table for data accesses while it is running in the secondary
space mode. Up to the z9-109 class machines this has been the case.
Unfortunately this is not true anymore with z10 and later machines.
The load-relative-long instructions lrl, lgrl and lgfrl access the
memory operand using the same addressing-space mode that has been
used to fetch the instruction.
This breaks the noexec mode for all user space binaries compiled
with march=z10 or later. The only option is to remove the current
noexec support.

Signed-off-by: Martin Schwidefsky