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https://github.com/torvalds/linux
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fd12a0d69a
GRU space is always mapped as WB in the page table. There is no need to track the mappings in the PAT. This also eliminates the "freeing invalid memtype" messages when the GRU space is unmapped. Signed-off-by: Jack Steiner <steiner@sgi.com> LKML-Reference: <20091119202341.GA4420@sgi.com> [ v2: fix build failure ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
29 lines
702 B
C
29 lines
702 B
C
#ifndef _ASM_X86_PAT_H
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#define _ASM_X86_PAT_H
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#include <linux/types.h>
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#include <asm/pgtable_types.h>
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#ifdef CONFIG_X86_PAT
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extern int pat_enabled;
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#else
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static const int pat_enabled;
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#endif
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extern void pat_init(void);
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extern int reserve_memtype(u64 start, u64 end,
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unsigned long req_type, unsigned long *ret_type);
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extern int free_memtype(u64 start, u64 end);
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extern int kernel_map_sync_memtype(u64 base, unsigned long size,
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unsigned long flag);
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int io_reserve_memtype(resource_size_t start, resource_size_t end,
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unsigned long *type);
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void io_free_memtype(resource_size_t start, resource_size_t end);
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int default_is_untracked_pat_range(u64 start, u64 end);
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#endif /* _ASM_X86_PAT_H */
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