1. 18 Oct, 2016 1 commit
  2. 16 Feb, 2016 1 commit
    • Dave Hansen's avatar
      mm/gup: Switch all callers of get_user_pages() to not pass tsk/mm · d4edcf0d
      Dave Hansen authored
      We will soon modify the vanilla get_user_pages() so it can no
      longer be used on mm/tasks other than 'current/current->mm',
      which is by far the most common way it is called.  For now,
      we allow the old-style calls, but warn when they are used.
      (implemented in previous patch)
      
      This patch switches all callers of:
      
      	get_user_pages()
      	get_user_pages_unlocked()
      	get_user_pages_locked()
      
      to stop passing tsk/mm so they will no longer see the warnings.
      Signed-off-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Dave Hansen <dave@sr71.net>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: jack@suse.cz
      Cc: linux-mm@kvack.org
      Link: http://lkml.kernel.org/r/20160212210156.113E9407@viggo.jf.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      d4edcf0d
  3. 16 Jan, 2016 2 commits
  4. 12 Feb, 2015 1 commit
  5. 24 Oct, 2014 1 commit
    • David S. Miller's avatar
      sparc64: Implement __get_user_pages_fast(). · 06090e8e
      David S. Miller authored
      It is not sufficient to only implement get_user_pages_fast(), you
      must also implement the atomic version __get_user_pages_fast()
      otherwise you end up using the weak symbol fallback implementation
      which simply returns zero.
      
      This is dangerous, because it causes the futex code to loop forever
      if transparent hugepages are supported (see get_futex_key()).
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      06090e8e
  6. 04 May, 2014 1 commit
  7. 13 Nov, 2013 1 commit
    • David S. Miller's avatar
      sparc64: Encode huge PMDs using PTE encoding. · a7b9403f
      David S. Miller authored
      Now that we have 64-bits for PMDs we can stop using special encodings
      for the huge PMD values, and just put real PTEs in there.
      
      We allocate a _PAGE_PMD_HUGE bit to distinguish between plain PMDs and
      huge ones.  It is the same for both 4U and 4V PTE layouts.
      
      We also use _PAGE_SPECIAL to indicate the splitting state, since a
      huge PMD cannot also be special.
      
      All of the PMD --> PTE translation code disappears, and most of the
      huge PMD bit modifications and tests just degenerate into the PTE
      operations.  In particular USER_PGTABLE_CHECK_PMD_HUGE becomes
      trivial.
      
      As a side effect, normal PMDs don't shift the physical address around.
      This also speeds up the page table walks in the TLB miss paths since
      they don't have to do the shifts any more.
      
      Another non-trivial aspect is that pte_modify() has to be changed
      to preserve the _PAGE_PMD_HUGE bits as well as the page size field
      of the pte.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a7b9403f
  8. 13 Feb, 2013 1 commit
  9. 02 Nov, 2011 2 commits
  10. 26 Jul, 2011 1 commit
  11. 14 Jan, 2011 1 commit
  12. 30 Oct, 2009 1 commit
    • David Gibson's avatar
      powerpc/mm: Allow more flexible layouts for hugepage pagetables · a4fe3ce7
      David Gibson authored
      Currently each available hugepage size uses a slightly different
      pagetable layout: that is, the bottem level table of pointers to
      hugepages is a different size, and may branch off from the normal page
      tables at a different level.  Every hugepage aware path that needs to
      walk the pagetables must therefore look up the hugepage size from the
      slice info first, and work out the correct way to walk the pagetables
      accordingly.  Future hardware is likely to add more possible hugepage
      sizes, more layout options and more mess.
      
      This patch, therefore reworks the handling of hugepage pagetables to
      reduce this complexity.  In the new scheme, instead of having to
      consult the slice mask, pagetable walking code can check a flag in the
      PGD/PUD/PMD entries to see where to branch off to hugepage pagetables,
      and the entry also contains the information (eseentially hugepage
      shift) necessary to then interpret that table without recourse to the
      slice mask.  This scheme can be extended neatly to handle multiple
      levels of self-describing "special" hugepage pagetables, although for
      now we assume only one level exists.
      
      This approach means that only the pagetable allocation path needs to
      know how the pagetables should be set out.  All other (hugepage)
      pagetable walking paths can just interpret the structure as they go.
      
      There already was a flag bit in PGD/PUD/PMD entries for hugepage
      directory pointers, but it was only used for debug.  We alter that
      flag bit to instead be a 0 in the MSB to indicate a hugepage pagetable
      pointer (normally it would be 1 since the pointer lies in the linear
      mapping).  This means that asm pagetable walking can test for (and
      punt on) hugepage pointers with the same test that checks for
      unpopulated page directory entries (beq becomes bge), since hugepage
      pointers will always be positive, and normal pointers always negative.
      
      While we're at it, we get rid of the confusing (and grep defeating)
      #defining of hugepte_shift to be the same thing as mmu_huge_psizes.
      Signed-off-by: default avatarDavid Gibson <dwg@au1.ibm.com>
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      a4fe3ce7
  13. 08 Jul, 2009 1 commit
  14. 11 Mar, 2009 1 commit
  15. 13 Oct, 2008 1 commit
  16. 30 Jul, 2008 1 commit