x86/mm/pat: Extend set_page_memtype() to support Write-Through type

As set_memory_wb() calls free_ram_pages_type(), which then calls
set_page_memtype() with -1, _PGMT_DEFAULT is used for tracking
the WB type. _PGMT_WB is defined but unused. Thus, rename
_PGMT_DEFAULT to _PGMT_WB to clarify the usage, and release the
slot used by _PGMT_WB.

Furthermore, change free_ram_pages_type() to call
set_page_memtype() with _PGMT_WB, and get_page_memtype() to
return _PAGE_CACHE_MODE_WB for _PGMT_WB.

Then, define _PGMT_WT in the freed slot. This allows
set_page_memtype() to track the WT type.

Signed-off-by: Toshi Kani <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: [email protected]
Cc: H. Peter Anvin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Luis R. Rodriguez <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: linux-mm <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions