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Merge branch 'x86-pat-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

Browse source 
* 'x86-pat-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: pat: Remove ioremap_default()
  x86: pat: Clean up req_type special case for reserve_memtype()
  x86: Relegate CONFIG_PAT and CONFIG_MTRR configurability to EMBEDDED
This commit is contained in:
Linus Torvalds 2009-12-08 13:34:17 -08:00
commit b391738bd1
3 changed files with 7 additions and 33 deletions
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7
arch/x86/Kconfig
View file

@ -1332,7 +1332,9 @@ config MATH_EMULATION
kernel, it won't hurt.
config MTRR
bool "MTRR (Memory Type Range Register) support"
bool
default y
prompt "MTRR (Memory Type Range Register) support" if EMBEDDED
---help---
On Intel P6 family processors (Pentium Pro, Pentium II and later)
the Memory Type Range Registers (MTRRs) may be used to control
@ -1398,7 +1400,8 @@ config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
config X86_PAT
bool
prompt "x86 PAT support"
default y
prompt "x86 PAT support" if EMBEDDED
depends on MTRR
---help---
Use PAT attributes to setup page level cache control.

26
arch/x86/mm/ioremap.c
View file

@ -281,30 +281,6 @@ void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size)
}
EXPORT_SYMBOL(ioremap_cache);
static void __iomem *ioremap_default(resource_size_t phys_addr,
unsigned long size)
{
unsigned long flags;
void __iomem *ret;
int err;
/*
* - WB for WB-able memory and no other conflicting mappings
* - 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,
_PAGE_CACHE_WB, &flags);
if (err < 0)
return NULL;
ret = __ioremap_caller(phys_addr, size, flags,
__builtin_return_address(0));
free_memtype(phys_addr, phys_addr + size);
return ret;
}
void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size,
unsigned long prot_val)
{
@ -380,7 +356,7 @@ void *xlate_dev_mem_ptr(unsigned long phys)
if (page_is_ram(start >> PAGE_SHIFT))
return __va(phys);
addr = (void __force *)ioremap_default(start, PAGE_SIZE);
addr = (void __force *)ioremap_cache(start, PAGE_SIZE);
if (addr)
addr = (void *)((unsigned long)addr | (phys & ~PAGE_MASK));

7
arch/x86/mm/pat.c
View file

@ -356,9 +356,6 @@ static int free_ram_pages_type(u64 start, u64 end)
* - _PAGE_CACHE_UC_MINUS
* - _PAGE_CACHE_UC
*
* req_type will have a special case value '-1', when requester want to inherit
* the memory type from mtrr (if WB), existing PAT, defaulting to UC_MINUS.
*
* If new_type is NULL, function will return an error if it cannot reserve the
* region with req_type. If new_type is non-NULL, function will return
* available type in new_type in case of no error. In case of any error
@ -378,9 +375,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
if (!pat_enabled) {
/* This is identical to page table setting without PAT */
if (new_type) {
if (req_type == -1)
*new_type = _PAGE_CACHE_WB;
else if (req_type == _PAGE_CACHE_WC)
if (req_type == _PAGE_CACHE_WC)
*new_type = _PAGE_CACHE_UC_MINUS;
else
*new_type = req_type & _PAGE_CACHE_MASK;