linux-toradex.git/arch/parisc/kernel, branch v3.9.6

parisc: use long branch in fork_like macro

2013-05-19T18:38:46+00:00

commit bbbfde782084b4f0d85ddffb88f1cf4650ff40e4 upstream.

The "b" branch instruction used in the fork_like macro only can handle
17-bit pc-relative offsets.
This fails with an out of range offset with some .config files.
Rewrite to use the "be" instruction which
can branch to any address in a space.

Signed-off-by: John David Anglin  
Signed-off-by: Helge Deller 
Signed-off-by: Greg Kroah-Hartman

parisc: fix SMP races when updating PTE and TLB entries in entry.S

2013-05-19T18:38:45+00:00

commit f0a18819e261afc5fdbd8c5c6f9943123c5461ba upstream.

Currently, race conditions exist in the handling of TLB interruptions in
entry.S.  In particular, dirty bit updates can be lost if an accessed
interruption occurs just after the dirty bit interruption on a different
cpu.  Lost dirty bit updates result in user pages not being flushed and
general system instability.  This change adds lock and unlock macros to
synchronize all PTE and TLB updates done in entry.S.  As a result,
userspace stability is significantly improved.

Signed-off-by: John David Anglin  
Signed-off-by: Helge Deller 
Signed-off-by: Greg Kroah-Hartman

parisc: only re-enable interrupts if we need to schedule or deliver signals when returning to userspace

2013-05-19T18:38:45+00:00

commit c207a76bf155cb5cf24cf849c08f6555e9180594 upstream.

Helge and I have found that we have a kernel stack overflow problem
which causes a variety of random failures.
Currently, we re-enable interrupts when returning from an external
interrupt incase we need to schedule or delivery
signals.  As a result, a potentially unlimited number of interrupts
can occur while we are running on the kernel
stack.  It is very limited in space (currently, 16k).  This change
defers enabling interrupts until we have
actually decided to schedule or delivery signals.  This only occurs
when we about to return to userspace.  This
limits the number of interrupts on the kernel stack to one.  In other
cases, interrupts remain disabled until the
final return from interrupt (rfi).

Signed-off-by: John David Anglin  
Signed-off-by: Helge Deller 
Signed-off-by: Greg Kroah-Hartman

parisc: use spin_lock_irqsave/spin_unlock_irqrestore for PTE updates

2013-04-25T20:37:00+00:00

User applications running on SMP kernels have long suffered from instability
and random segmentation faults.  This patch improves the situation although
there is more work to be done.

One of the problems is the various routines in pgtable.h that update page table
entries use different locking mechanisms, or no lock at all (set_pte_at).  This
change modifies the routines to all use the same lock pa_dbit_lock.  This lock
is used for dirty bit updates in the interruption code. The patch also purges
the TLB entries associated with the PTE to ensure that inconsistent values are
not used after the page table entry is updated.  The UP and SMP code are now
identical.

The change also includes a minor update to the purge_tlb_entries function in
cache.c to improve its efficiency.

Signed-off-by: John David Anglin 
Cc: Helge Deller 
Signed-off-by: Helge Deller

parisc: Provide __ucmpdi2 to resolve undefined references in 32 bit builds.

2013-04-25T20:36:15+00:00

The Debian experimental linux source package (3.8.5-1) build fails
with the following errors:
...
MODPOST 2016 modules
ERROR: "__ucmpdi2" [fs/btrfs/btrfs.ko] undefined!
ERROR: "__ucmpdi2" [drivers/md/dm-verity.ko] undefined!

The attached patch resolves this problem.  It is based on the s390
implementation of ucmpdi2.c.

Signed-off-by: John David Anglin 
Cc: "James E.J. Bottomley" 
Signed-off-by: Helge Deller

Merge branch 'fixes-for-3.9-latest' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2013-03-03T20:57:38+00:00

Pull second round of PARISC updates from Helge Deller:
 "The most important fix in this branch is the switch of io_setup,
  io_getevents and io_submit syscalls to use the available compat
  syscalls when running 32bit userspace on 64bit kernel.  Other than
  that it's mostly removal of compile warnings."

* 'fixes-for-3.9-latest' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: fix redefinition of SET_PERSONALITY
  parisc: do not install modules when installing kernel
  parisc: fix compile warnings triggered by atomic_sub(sizeof(),v)
  parisc: check return value of down_interruptible() in hp_sdc_rtc.c
  parisc: avoid unitialized variable warning in pa_memcpy()
  parisc: remove unused variable 'compat_val'
  parisc: switch to compat_functions of io_setup, io_getevents and io_submit
  parisc: select ARCH_WANT_FRAME_POINTERS

parisc: fix redefinition of SET_PERSONALITY

2013-03-02T19:15:28+00:00

commit e72837e3e7bae3f182c4ac63c9424e86f1158dd0 introduced
a default SET_PERSONALITY() in include/linux/elf.h.
This breaks with our own SET_PERSONALITY define for
32bit userspace on 64bit kernel.

Signed-off-by: Helge Deller

parisc: remove unused variable 'compat_val'

2013-03-02T18:56:18+00:00

clean up after commit 6e26aab98ce8a818fb1ec47f8f727a8480a9011b
(switch to generic sigaltstack)

Signed-off-by: Helge Deller

parisc: switch to compat_functions of io_setup, io_getevents and io_submit

2013-03-02T18:56:08+00:00

Signed-off-by: Helge Deller

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-03-02T16:34:06+00:00

Pull signal/compat fixes from Al Viro:
 "Fixes for several regressions introduced in the last signal.git pile,
  along with fixing bugs in truncate and ftruncate compat (on just about
  anything biarch at least one of those two had been done wrong)."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal:
  compat: restore timerfd settime and gettime compat syscalls
  [regression] braino in "sparc: convert to ksignal"
  fix compat truncate/ftruncate
  switch lseek to COMPAT_SYSCALL_DEFINE
  lseek() and truncate() on sparc really need sign extension