linux-stable.git/arch/parisc/kernel, branch v4.5

parisc: Wire up copy_file_range syscall

2016-03-01T22:21:11+00:00

Signed-off-by: Helge Deller

parisc: Fix ptrace syscall number and return value modification

2016-03-01T22:06:07+00:00

Mike Frysinger reported that his ptrace testcase showed strange
behaviour on parisc: It was not possible to avoid a syscall and the
return value of a syscall couldn't be changed.

To modify a syscall number, we were missing to save the new syscall
number to gr20 which is then picked up later in assembly again.

The effect that the return value couldn't be changed is a side-effect of
another bug in the assembly code. When a process is ptraced, userspace
expects each syscall to report entrance and exit of a syscall.  If a
syscall number was given which doesn't exist, we jumped to the normal
syscall exit code instead of informing userspace that the (non-existant)
syscall exits. This unexpected behaviour confuses userspace and thus the
bug was misinterpreted as if we can't change the return value.

This patch fixes both problems and was tested on 64bit kernel with
32bit userspace.

Signed-off-by: Helge Deller 
Cc: Mike Frysinger 
Cc: stable@vger.kernel.org  # v4.0+
Tested-by: Mike Frysinger

parisc: convert to dma_map_ops

2016-01-21T01:09:18+00:00

Signed-off-by: Christoph Hellwig 
Tested-by: Helge Deller 
Acked-by: Helge Deller 
Cc: Christian Borntraeger 
Cc: Joerg Roedel 
Cc: Sebastian Ott 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'parisc-4.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2016-01-17T21:20:54+00:00

Pull parsic updates from Helge Deller:
 "This patchset includes two major fixes which are both scheduled for
  stable:

  First, __ARCH_SI_PREAMBLE_SIZE was defined with a wrong value.
  Second, huge page pte and TLB changes needed protection with a
  spinlock.  Other than that there are just some trivial optimizations
  and cleanups"

* 'parisc-4.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Protect huge page pte changes with spinlocks
  parisc: Imporove debug info about space registers and TLB configuration
  parisc: Drop parisc-specific NSIGTRAP define
  parisc: Fix __ARCH_SI_PREAMBLE_SIZE
  parisc: Reduce overhead of parisc_requires_coherency()
  parisc: Initialize PCI bridge cache line and default latency

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

2016-01-15T00:38:02+00:00

Pull livepatching updates from Jiri Kosina:

 - RO/NX attribute fixes for patch module relocations from Josh
   Poimboeuf.  As part of this effort, module.c has been cleaned up as
   well and livepatching is piggy-backing on this cleanup.  Rusty is OK
   with this whole lot going through livepatching tree.

 - symbol disambiguation support from Chris J Arges.  That series is
   also

        Reviewed-by: Miroslav Benes 

   but this came in only after I've alredy pushed out.  Didn't want to
   rebase because of that, hence I am mentioning it here.

 - symbol lookup fix from Miroslav Benes

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching:
  livepatch: Cleanup module page permission changes
  module: keep percpu symbols in module's symtab
  module: clean up RO/NX handling.
  module: use a structure to encapsulate layout.
  gcov: use within_module() helper.
  module: Use the same logic for setting and unsetting RO/NX
  livepatch: function,sympos scheme in livepatch sysfs directory
  livepatch: add sympos as disambiguator field to klp_reloc
  livepatch: add old_sympos as disambiguator field to klp_func

parisc: Imporove debug info about space registers and TLB configuration

2016-01-12T21:12:09+00:00

Signed-off-by: Helge Deller

parisc: Reduce overhead of parisc_requires_coherency()

2016-01-12T21:03:36+00:00

Signed-off-by: Helge Deller

parisc: Initialize PCI bridge cache line and default latency

2016-01-12T21:03:21+00:00

PCI controllers and pci-pci bridges may have not been fully initialized
regarding cache line and defaul latency.

This partly reverts
commit 5f0e9b4 ("parisc: Remove unused pcibios_init_bus()")

Signed-off-by: Helge Deller

parisc: Fix syscall restarts

2015-12-21T09:16:18+00:00

On parisc syscalls which are interrupted by signals sometimes failed to
restart and instead returned -ENOSYS which in the worst case lead to
userspace crashes.
A similiar problem existed on MIPS and was fixed by commit e967ef02
("MIPS: Fix restart of indirect syscalls").

On parisc the current syscall restart code assumes that all syscall
callers load the syscall number in the delay slot of the ble
instruction. That's how it is e.g. done in the unistd.h header file:
	ble 0x100(%sr2, %r0)
	ldi #syscall_nr, %r20
Because of that assumption the current code never restored %r20 before
returning to userspace.

This assumption is at least not true for code which uses the glibc
syscall() function, which instead uses this syntax:
	ble 0x100(%sr2, %r0)
	copy regX, %r20
where regX depend on how the compiler optimizes the code and register
usage.

This patch fixes this problem by adding code to analyze how the syscall
number is loaded in the delay branch and - if needed - copy the syscall
number to regX prior returning to userspace for the syscall restart.

Signed-off-by: Helge Deller 
Cc: stable@vger.kernel.org
Cc: Mathieu Desnoyers

parisc: Wire up mlock2 syscall

2015-12-12T15:07:44+00:00

Signed-off-by: Helge Deller