target/linux/brcm47xx/patches-2.6.28/160-kmap_coherent.patch

   1 diff --git a/arch/mips/include/asm/cpu-features.h b/arch/mips/include/asm/cpu-features.h
   2 --- a/arch/mips/include/asm/cpu-features.h
   3 +++ b/arch/mips/include/asm/cpu-features.h
   4 @@ -101,6 +101,9 @@
   5  #ifndef cpu_has_pindexed_dcache
   6  #define cpu_has_pindexed_dcache        (cpu_data[0].dcache.flags & MIPS_CACHE_PINDEX)
   7  #endif
   8 +#ifndef cpu_use_kmap_coherent
   9 +#define cpu_use_kmap_coherent 1
  10 +#endif
  11
  12  /*
  13   * I-Cache snoops remote store.  This only matters on SMP.  Some multiprocessors
  14 diff --git a/arch/mips/include/asm/mach-bcm47xx/cpu-feature-overrides.h b/arch/mips/include/asm/mach-bcm47xx/cpu-feature-overrides.h
  15 --- /dev/null
  16 +++ b/arch/mips/include/asm/mach-bcm47xx/cpu-feature-overrides.h
  17 @@ -0,0 +1,13 @@
  18 +/*
  19 + * This file is subject to the terms and conditions of the GNU General Public
  20 + * License.  See the file "COPYING" in the main directory of this archive
  21 + * for more details.
  22 + *
  23 + * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
  24 + */
  25 +#ifndef __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H
  26 +#define __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H
  27 +
  28 +#define cpu_use_kmap_coherent  0
  29 +
  30 +#endif /* __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H */
  31 diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
  32 --- a/arch/mips/mm/c-r4k.c
  33 +++ b/arch/mips/mm/c-r4k.c
  34 @@ -494,7 +494,7 @@ static inline void local_r4k_flush_cache_page(void *args)
  35                  */
  36                 map_coherent = (cpu_has_dc_aliases &&
  37                                 page_mapped(page) && !Page_dcache_dirty(page));
  38 -               if (map_coherent)
  39 +               if (map_coherent && cpu_use_kmap_coherent)
  40                         vaddr = kmap_coherent(page, addr);
  41                 else
  42                         vaddr = kmap_atomic(page, KM_USER0);
  43 @@ -517,7 +517,7 @@ static inline void local_r4k_flush_cache_page(void *args)
  44         }
  45
  46         if (vaddr) {
  47 -               if (map_coherent)
  48 +               if (map_coherent && cpu_use_kmap_coherent)
  49                         kunmap_coherent();
  50                 else
  51                         kunmap_atomic(vaddr, KM_USER0);
  52 diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
  53 --- a/arch/mips/mm/init.c
  54 +++ b/arch/mips/mm/init.c
  55 @@ -212,7 +212,7 @@ void copy_user_highpage(struct page *to, struct page *from,
  56         void *vfrom, *vto;
  57
  58         vto = kmap_atomic(to, KM_USER1);
  59 -       if (cpu_has_dc_aliases &&
  60 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  61             page_mapped(from) && !Page_dcache_dirty(from)) {
  62                 vfrom = kmap_coherent(from, vaddr);
  63                 copy_page(vto, vfrom);
  64 @@ -234,7 +234,7 @@ void copy_to_user_page(struct vm_area_struct *vma,
  65         struct page *page, unsigned long vaddr, void *dst, const void *src,
  66         unsigned long len)
  67  {
  68 -       if (cpu_has_dc_aliases &&
  69 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  70             page_mapped(page) && !Page_dcache_dirty(page)) {
  71                 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  72                 memcpy(vto, src, len);
  73 @@ -252,7 +252,7 @@ void copy_from_user_page(struct vm_area_struct *vma,
  74         struct page *page, unsigned long vaddr, void *dst, const void *src,
  75         unsigned long len)
  76  {
  77 -       if (cpu_has_dc_aliases &&
  78 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  79             page_mapped(page) && !Page_dcache_dirty(page)) {
  80                 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  81                 memcpy(dst, vfrom, len);