[PATCH 0/6] ksm changes (v2)

[Izik Eidus <ieidus@redhat.com>]

Following patchs touch 4 diffrent areas inside ksm:

1) Patchs 1 - 3: Change the api to be more robust and make more sense.
                 This include:
                     * Limiting the number of memory regions user can
                       register inside ksm per file descriptor that
                       he open.

                     * Reject overlap memory addresses registrations.

                     * change KSM_REMOVE_MEMORY_REGION ioctl to make
                       more sense, untill this patchs user was able
                       to register servel memory regions per file
                       descriptor, but when he called to
                       KSM_REMOVE_MEMORY_REGION, he had no way to tell
                       what memory region he want to remove, as a
                       result each call to KSM_REMOVE_MEMORY_REGION
                       nuked all the regions inside the fd.
                       Now KSM_REMOVE_MEMORY_REGION is working on
                       specific addresses.

2) Patch 4: Use generic helper functions to deal with the vma prot.
            
3) Patch 5: Return ksm to be build on all archs (Now after patch 4,
            ksm shouldnt break any arch).

4) Patch 6: change the miscdevice minor number - lets wait to Alan
            saying he is happy with this change before we apply.

>From V1 to V2:

Patch 3 (ksm: change the KSM_REMOVE_MEMORY_REGION ioctl.) was changed:

- Fixed bug found by Hugh.

- Make ksm_sma_ioctl_remove_memory_region return -EFAULT in case there
  is no such memory. (up untill now it was just return 0)


Thanks.


Izik Eidus (6):
  ksm: limiting the num of mem regions user can register per fd.
  ksm: dont allow overlap memory addresses registrations.
  ksm: change the KSM_REMOVE_MEMORY_REGION ioctl.
  ksm: change the prot handling to use the generic helper functions
  ksm: build system make it compile for all archs
  ksm: use another miscdevice minor number.

 Documentation/devices.txt  |    1 +
 include/linux/miscdevice.h |    2 +-
 mm/Kconfig                 |    1 -
 mm/ksm.c                   |  126 ++++++++++++++++++++++++++++++++++---------
 4 files changed, 101 insertions(+), 29 deletions(-)

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