target/linux/brcm47xx/patches-2.6.25/160-kmap_coherent.patch

   1 --- a/arch/mips/mm/init.c
   2 +++ b/arch/mips/mm/init.c
   3 @@ -211,7 +211,7 @@
   4         void *vfrom, *vto;
   5
   6         vto = kmap_atomic(to, KM_USER1);
   7 -       if (cpu_has_dc_aliases &&
   8 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
   9             page_mapped(from) && !Page_dcache_dirty(from)) {
  10                 vfrom = kmap_coherent(from, vaddr);
  11                 copy_page(vto, vfrom);
  12 @@ -235,7 +235,7 @@
  13         struct page *page, unsigned long vaddr, void *dst, const void *src,
  14         unsigned long len)
  15  {
  16 -       if (cpu_has_dc_aliases &&
  17 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  18             page_mapped(page) && !Page_dcache_dirty(page)) {
  19                 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  20                 memcpy(vto, src, len);
  21 @@ -255,7 +255,7 @@
  22         struct page *page, unsigned long vaddr, void *dst, const void *src,
  23         unsigned long len)
  24  {
  25 -       if (cpu_has_dc_aliases &&
  26 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  27             page_mapped(page) && !Page_dcache_dirty(page)) {
  28                 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  29                 memcpy(dst, vfrom, len);
  30 --- /dev/null
  31 +++ b/include/asm-mips/mach-bcm47xx/cpu-feature-overrides.h
  32 @@ -0,0 +1,13 @@
  33 +/*
  34 + * This file is subject to the terms and conditions of the GNU General Public
  35 + * License.  See the file "COPYING" in the main directory of this archive
  36 + * for more details.
  37 + *
  38 + * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
  39 + */
  40 +#ifndef __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H
  41 +#define __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H
  42 +
  43 +#define cpu_use_kmap_coherent  0
  44 +
  45 +#endif /* __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H */
  46 --- a/include/asm-mips/cpu-features.h
  47 +++ b/include/asm-mips/cpu-features.h
  48 @@ -101,6 +101,9 @@
  49  #ifndef cpu_has_pindexed_dcache
  50  #define cpu_has_pindexed_dcache        (cpu_data[0].dcache.flags & MIPS_CACHE_PINDEX)
  51  #endif
  52 +#ifndef cpu_use_kmap_coherent
  53 +#define cpu_use_kmap_coherent 1
  54 +#endif
  55
  56  /*
  57   * I-Cache snoops remote store.  This only matters on SMP.  Some multiprocessors
  58 --- a/arch/mips/mm/c-r4k.c
  59 +++ b/arch/mips/mm/c-r4k.c
  60 @@ -484,7 +484,7 @@
  61                  * Use kmap_coherent or kmap_atomic to do flushes for
  62                  * another ASID than the current one.
  63                  */
  64 -               if (cpu_has_dc_aliases)
  65 +               if (cpu_has_dc_aliases && cpu_use_kmap_coherent)
  66                         vaddr = kmap_coherent(page, addr);
  67                 else
  68                         vaddr = kmap_atomic(page, KM_USER0);
  69 @@ -505,7 +505,7 @@
  70         }
  71
  72         if (vaddr) {
  73 -               if (cpu_has_dc_aliases)
  74 +               if (cpu_has_dc_aliases && cpu_use_kmap_coherent)
  75                         kunmap_coherent();
  76                 else
  77                         kunmap_atomic(vaddr, KM_USER0);