target/linux/brcm47xx/patches-3.18/160-kmap_coherent.patch

   1 --- a/arch/mips/include/asm/cpu-features.h
   2 +++ b/arch/mips/include/asm/cpu-features.h
   3 @@ -151,6 +151,9 @@
   4  #ifndef cpu_has_local_ebase
   5  #define cpu_has_local_ebase    1
   6  #endif
   7 +#ifndef cpu_use_kmap_coherent
   8 +#define cpu_use_kmap_coherent 1
   9 +#endif
  10
  11  /*
  12   * I-Cache snoops remote store.         This only matters on SMP.  Some multiprocessors
  13 --- a/arch/mips/include/asm/mach-bcm47xx/cpu-feature-overrides.h
  14 +++ b/arch/mips/include/asm/mach-bcm47xx/cpu-feature-overrides.h
  15 @@ -79,4 +79,6 @@
  16  #define cpu_scache_line_size()         0
  17  #define cpu_has_vz                     0
  18
  19 +#define cpu_use_kmap_coherent          0
  20 +
  21  #endif /* __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H */
  22 --- a/arch/mips/mm/c-r4k.c
  23 +++ b/arch/mips/mm/c-r4k.c
  24 @@ -591,7 +591,7 @@ static inline void local_r4k_flush_cache
  25                  */
  26                 map_coherent = (cpu_has_dc_aliases &&
  27                                 page_mapped(page) && !Page_dcache_dirty(page));
  28 -               if (map_coherent)
  29 +               if (map_coherent && cpu_use_kmap_coherent)
  30                         vaddr = kmap_coherent(page, addr);
  31                 else
  32                         vaddr = kmap_atomic(page);
  33 @@ -616,7 +616,7 @@ static inline void local_r4k_flush_cache
  34         }
  35
  36         if (vaddr) {
  37 -               if (map_coherent)
  38 +               if (map_coherent && cpu_use_kmap_coherent)
  39                         kunmap_coherent();
  40                 else
  41                         kunmap_atomic(vaddr);
  42 --- a/arch/mips/mm/init.c
  43 +++ b/arch/mips/mm/init.c
  44 @@ -155,7 +155,7 @@ void copy_user_highpage(struct page *to,
  45         void *vfrom, *vto;
  46
  47         vto = kmap_atomic(to);
  48 -       if (cpu_has_dc_aliases &&
  49 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  50             page_mapped(from) && !Page_dcache_dirty(from)) {
  51                 vfrom = kmap_coherent(from, vaddr);
  52                 copy_page(vto, vfrom);
  53 @@ -177,7 +177,7 @@ void copy_to_user_page(struct vm_area_st
  54         struct page *page, unsigned long vaddr, void *dst, const void *src,
  55         unsigned long len)
  56  {
  57 -       if (cpu_has_dc_aliases &&
  58 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  59             page_mapped(page) && !Page_dcache_dirty(page)) {
  60                 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  61                 memcpy(vto, src, len);
  62 @@ -195,7 +195,7 @@ void copy_from_user_page(struct vm_area_
  63         struct page *page, unsigned long vaddr, void *dst, const void *src,
  64         unsigned long len)
  65  {
  66 -       if (cpu_has_dc_aliases &&
  67 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  68             page_mapped(page) && !Page_dcache_dirty(page)) {
  69                 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  70                 memcpy(dst, vfrom, len);