src/patches/suse-2.6.27.39/patches.arch/s390-add-FREE_PTE_NR

   1 From: Jeff Mahoney <jeffm@suse.com>
   2 Subject: [PATCH] s390: Define FREE_PTE_NR
   3 Patch-mainline: Never, unless FREE_PTE_NR is used in generic code
   4
   5  Commit ba8a9229ab9e80278c28ad68b15053f65b2b0a7c from
   6  Martin Schwidefsky <schwidefsky@de.ibm.com> removed the
   7  #include <asm-generic/tlb.h> from asm-s390/tlb.h when he defined the
   8  s390-specific TLB operations.
   9
  10  FREE_PTR_NR is generally an internal-only value, but our unmap_vmas-lat
  11  patch uses it to make smarter decisions about dumping PTEs in chunks.
  12
  13  This patch restores the generic value in asm-s390/tlb.h. Since it's only
  14  used for an optimization, this should be safe.
  15
  16 Signed-off-by: Jeff Mahoney <jeffm@suse.com>
  17
  18 ---
  19  arch/s390/include/asm/tlb.h |   13 +++++++++++++
  20  1 file changed, 13 insertions(+)
  21
  22 --- a/arch/s390/include/asm/tlb.h
  23 +++ b/arch/s390/include/asm/tlb.h
  24 @@ -34,6 +34,19 @@
  25  #define TLB_NR_PTRS    508
  26  #endif
  27
  28 +/* Lifted from asm-generic/tlb.h; Is used by patches.suse/unmap_vmas-lat */
  29 +/*
  30 + * For UP we don't need to worry about TLB flush
  31 + * and page free order so much..
  32 + */
  33 +#ifdef CONFIG_SMP
  34 +  #define FREE_PTE_NR 506
  35 +  #define tlb_fast_mode(tlb) ((tlb)->nr == ~0U)
  36 +#else
  37 +  #define FREE_PTE_NR   1
  38 +  #define tlb_fast_mode(tlb) 1
  39 +#endif
  40 +
  41  struct mmu_gather {
  42         struct mm_struct *mm;
  43         unsigned int fullmm;