linux.git/arch/s390/include/asm/setup.h, branch v3.11

s390/mem_detect: remove artificial kdump memory types

2013-05-03T12:21:15+00:00

Simplify the memory detection code a bit by removing the CHUNK_OLDMEM
and CHUNK_CRASHK memory types.
They are not needed. Everything that is needed is a mechanism to
insert holes into the detected memory.

Reviewed-by: Michael Holzheu 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/mem_detect: limit memory detection loop to "mem=" parameter

2013-05-02T13:50:26+00:00

The current memory detection loop will detect all present memory of
a machine. This is true even if the user specified the "mem=" parameter
on the kernel command line.
This can be a problem since the memory detection may cause a fully
populated host page table for the guest, even for those parts of the
memory that the guest will never use afterwards.

So fix this and only detect memory up to a user supplied "mem=" limit
if specified.

Reported-by: Michael Johanssen 
Reviewed-by: Michael Holzheu 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390: get rid of odd global real_memory_size

2013-05-02T13:50:25+00:00

The variable real_memory_size has odd semantics and has been used in
a broken way by e.g. the old kvm code.
Therefore get rid of it before anybody else makes use of it.

Reviewed-by: Michael Holzheu 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/cleanup: rename SPP to LPP

2013-02-14T14:55:24+00:00

The set-program-parameter (SPP) instruction has been renamed to
load-program-parameter (LPP) (see SA23-2260).  Reflect this change
and rename all macro/instruction references.

Also remove the duplicate SPP/LPP entry in the kernel disassembler
instruction list.

Signed-off-by: Hendrik Brueckner 
Signed-off-by: Martin Schwidefsky

s390/mm: implement software dirty bits

2013-02-14T14:55:23+00:00

The s390 architecture is unique in respect to dirty page detection,
it uses the change bit in the per-page storage key to track page
modifications. All other architectures track dirty bits by means
of page table entries. This property of s390 has caused numerous
problems in the past, e.g. see git commit ef5d437f71afdf4a
"mm: fix XFS oops due to dirty pages without buffers on s390".

To avoid future issues in regard to per-page dirty bits convert
s390 to a fault based software dirty bit detection mechanism. All
user page table entries which are marked as clean will be hardware
read-only, even if the pte is supposed to be writable. A write by
the user process will trigger a protection fault which will cause
the user pte to be marked as dirty and the hardware read-only bit
is removed.

With this change the dirty bit in the storage key is irrelevant
for Linux as a host, but the storage key is still required for
KVM guests. The effect is that page_test_and_clear_dirty and the
related code can be removed. The referenced bit in the storage
key is still used by the page_test_and_clear_young primitive to
provide page age information.

For page cache pages of mappings with mapping_cap_account_dirty
there will not be any change in behavior as the dirty bit tracking
already uses read-only ptes to control the amount of dirty pages.
Only for swap cache pages and pages of mappings without
mapping_cap_account_dirty there can be additional protection faults.
To avoid an excessive number of additional faults the mk_pte
primitive checks for PageDirty if the pgprot value allows for writes
and pre-dirties the pte. That avoids all additional faults for
tmpfs and shmem pages until these pages are added to the swap cache.

Signed-off-by: Martin Schwidefsky

Merge tag 'disintegrate-s390-20121009' of

2012-10-09T12:18:10+00:00

git://git.infradead.org/users/dhowells/linux-headers

Pull UAPI patchset from David Howells:
 "Can you merge the following branch into the s390 tree please.
  This is to complete part of the UAPI disintegration for which the
  preparatory patches were pulled recently."

Conflicts:
	arch/s390/include/asm/chpid.h

s390/mm: use pfmf instruction to initialize storage keys

2012-10-09T12:16:55+00:00

Make use of the pfmf instruction, if available, to initialize storage keys
of whole 1MB or 2GB frames instead of initializing every single page with
the sske instruction.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/facilities: cleanup PFMF and HPAGE machine facility detection

2012-10-09T12:16:55+00:00

MACHINE_HAS_PFMF and MACHINE_HAS_HPAGE actually have the same semantics:
the cpu has the EDAT1 facility installed in zArch mode. So remove one
of the feature flags in machine_flags and rename the other one to EDAT1.

The two old macros simply get mapped to MACHINE_HAS_EDAT1.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

UAPI: (Scripted) Disintegrate arch/s390/include/asm

2012-10-09T08:47:31+00:00

Signed-off-by: David Howells 
Acked-by: Arnd Bergmann 
Acked-by: Thomas Gleixner 
Acked-by: Michael Kerrisk 
Acked-by: Paul E. McKenney 
Acked-by: Dave Jones

thp, s390: architecture backend for thp on s390

2012-10-09T07:22:31+00:00

This implements the architecture backend for transparent hugepages
on s390.

Signed-off-by: Gerald Schaefer 
Cc: Andrea Arcangeli 
Cc: Andi Kleen 
Cc: Hugh Dickins 
Cc: Hillf Danton 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds