linux-kernel - [PATCH -tip 1/2] x86: PAT cleanup req_type special case for pat reserve

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Date:	Tue, 10 Nov 2009 17:23:07 +0800
From:	Xiaotian Feng <dfeng@...hat.com>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, Xiaotian Feng <dfeng@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: [PATCH -tip 1/2] x86: PAT cleanup req_type special case for pat reserve_memtype

commit b6ff32 consolidates code in pat_x_mtrr_type and reserve_memtype,
which removes the special case (req_type is -1) for pat enabled part.
We should also change comments and pat disabled part.

Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com> 
---
 arch/x86/mm/pat.c |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index e78cd0e..81fb753 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -355,9 +355,6 @@ 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
@@ -377,9 +374,7 @@ 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;
-- 
1.6.2.5

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