linux/arch/xtensa
Laurent Dufour 2ae416b142 mm: new mm hook framework
CRIU is recreating the process memory layout by remapping the checkpointee
memory area on top of the current process (criu).  This includes remapping
the vDSO to the place it has at checkpoint time.

However some architectures like powerpc are keeping a reference to the
vDSO base address to build the signal return stack frame by calling the
vDSO sigreturn service.  So once the vDSO has been moved, this reference
is no more valid and the signal frame built later are not usable.

This patch serie is introducing a new mm hook framework, and a new
arch_remap hook which is called when mremap is done and the mm lock still
hold.  The next patch is adding the vDSO remap and unmap tracking to the
powerpc architecture.

This patch (of 3):

This patch introduces a new set of header file to manage mm hooks:
- per architecture empty header file (arch/x/include/asm/mm-arch-hooks.h)
- a generic header (include/linux/mm-arch-hooks.h)

The architecture which need to overwrite a hook as to redefine it in its
header file, while architecture which doesn't need have nothing to do.

The default hooks are defined in the generic header and are used in the
case the architecture is not defining it.

In a next step, mm hooks defined in include/asm-generic/mm_hooks.h should
be moved here.

Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-06-24 17:49:41 -07:00
..
boot xtensa: xtfpga: add audio card to xtfpga DTS 2015-02-07 11:21:39 +03:00
configs xtensa: xtfpga: provide defconfig with audio subsystem 2015-02-07 12:52:12 +03:00
include mm: new mm hook framework 2015-06-24 17:49:41 -07:00
kernel Xtensa changes and fixes for 4.1 2015-04-17 15:32:30 -04:00
lib xtensa: clean up files to make them code-style compliant 2012-12-18 21:10:25 -08:00
mm mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in the handler 2015-05-19 08:39:15 +02:00
oprofile xtensa: fix oprofile building as module 2013-05-09 01:07:09 -07:00
platforms Xtensa improvements for 4.1: 2015-04-14 04:47:53 +00:00
variants xtensa: remove s6000 variant and s6105 platform 2014-10-21 13:29:01 +04:00
Kconfig Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-06-23 14:08:54 -07:00
Kconfig.debug xtensa: disable link optimization 2014-12-15 23:47:24 -08:00
Makefile xtensa: remove s6000 variant and s6105 platform 2014-10-21 13:29:01 +04:00