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Commit 69e26be9 authored by Andreas Herrmann's avatar Andreas Herrmann Committed by Ingo Molnar
Browse files

x86: pat.c more trivial changes 



 - add BUG statement to catch invalid start and end parameters
 - No need to track the actual type in both req_type and actual_type --
   keep req_type unchanged.
 - removed (IMHO) superfluous comments

Signed-off-by: default avatarAndreas Herrmann <andreas.herrmann3@amd.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Suresh B Siddha <suresh.b.siddha@intel.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ac97991e

arch/x86/mm/pat.c

+8 −13
Original line number Diff line number Diff line
@@ -200,7 +200,8 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type, 
	unsigned long actual_type;

	int err = 0;



	/* Only track when pat_enabled */

 	BUG_ON(start >= end); /* end is exclusive */



	if (!pat_enabled) {

		/* This is identical to page table setting without PAT */

		if (new_type) {
@@ -228,17 +229,13 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type, 
		 */

		u8 mtrr_type = mtrr_type_lookup(start, end);



		if (mtrr_type == MTRR_TYPE_WRBACK) {

			req_type = _PAGE_CACHE_WB;

		if (mtrr_type == MTRR_TYPE_WRBACK)

			actual_type = _PAGE_CACHE_WB;

		} else {

			req_type = _PAGE_CACHE_UC_MINUS;

		else

			actual_type = _PAGE_CACHE_UC_MINUS;

		}

	} else {

		req_type &= _PAGE_CACHE_MASK;

		actual_type = pat_x_mtrr_type(start, end, req_type);

	}

	} else

		actual_type = pat_x_mtrr_type(start, end,

					      req_type & _PAGE_CACHE_MASK);



	new  = kmalloc(sizeof(struct memtype), GFP_KERNEL);

	if (!new)
@@ -406,10 +403,8 @@ int free_memtype(u64 start, u64 end) 
	struct memtype *entry;

	int err = -EINVAL;



	/* Only track when pat_enabled */

	if (!pat_enabled) {

	if (!pat_enabled)

		return 0;

	}



	/* Low ISA region is always mapped WB. No need to track */

	if (is_ISA_range(start, end - 1))