diff options
| -rw-r--r-- | arch/x86/mm/ioremap.c | 3 | ||||
| -rw-r--r-- | arch/x86/mm/pat.c | 35 |
2 files changed, 15 insertions, 23 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 329387eca12..d4c4b2c4dbb 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -375,7 +375,8 @@ static void __iomem *ioremap_default(resource_size_t phys_addr, * - UC_MINUS for non-WB-able memory with no other conflicting mappings * - Inherit from confliting mappings otherwise */ - err = reserve_memtype(phys_addr, phys_addr + size, -1, &flags); + err = reserve_memtype(phys_addr, phys_addr + size, + _PAGE_CACHE_WB, &flags); if (err < 0) return NULL; diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index 640339ee4fb..8d3de958050 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -182,10 +182,10 @@ static unsigned long pat_x_mtrr_type(u64 start, u64 end, unsigned long req_type) u8 mtrr_type; mtrr_type = mtrr_type_lookup(start, end); - if (mtrr_type == MTRR_TYPE_UNCACHABLE) - return _PAGE_CACHE_UC; - if (mtrr_type == MTRR_TYPE_WRCOMB) - return _PAGE_CACHE_WC; + if (mtrr_type != MTRR_TYPE_WRBACK) + return _PAGE_CACHE_UC_MINUS; + + return _PAGE_CACHE_WB; } return req_type; @@ -352,23 +352,13 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type, return 0; } - if (req_type == -1) { - /* - * Call mtrr_lookup to get the type hint. This is an - * optimization for /dev/mem mmap'ers into WB memory (BIOS - * tools and ACPI tools). Use WB request for WB memory and use - * UC_MINUS otherwise. - */ - u8 mtrr_type = mtrr_type_lookup(start, end); - - if (mtrr_type == MTRR_TYPE_WRBACK) - actual_type = _PAGE_CACHE_WB; - else - actual_type = _PAGE_CACHE_UC_MINUS; - } else { - actual_type = pat_x_mtrr_type(start, end, - req_type & _PAGE_CACHE_MASK); - } + /* + * Call mtrr_lookup to get the type hint. This is an + * optimization for /dev/mem mmap'ers into WB memory (BIOS + * tools and ACPI tools). Use WB request for WB memory and use + * UC_MINUS otherwise. + */ + actual_type = pat_x_mtrr_type(start, end, req_type & _PAGE_CACHE_MASK); if (new_type) *new_type = actual_type; @@ -587,7 +577,8 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, if (flags != -1) { retval = reserve_memtype(offset, offset + size, flags, NULL); } else { - retval = reserve_memtype(offset, offset + size, -1, &flags); + retval = reserve_memtype(offset, offset + size, + _PAGE_CACHE_WB, &flags); } if (retval < 0) |