x86: PAT phys_mem_access_prot_allowed for dev/mem mmap

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Introduce phys_mem_access_prot_allowed(), which checks whether the mapping
is possible, without any conflicts and returns success or failure based on that.
phys_mem_access_prot() by itself does not allow failure case. This ability
to return error is needed for PAT where we may have aliasing conflicts.

x86 setup __HAVE_PHYS_MEM_ACCESS_PROT and move x86 specific code out of
/dev/mem into arch specific area.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

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venkatesh.pallipadi@intel.com 2008-03-18 17:00:20 -07:00 • committed by Ingo Molnar

parent e045fb2a98

commit f0970c13b6

3 changed files with 59 additions and 30 deletions

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39

arch/x86/mm/pat.c

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41

drivers/char/mem.c

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9

include/asm-x86/pgtable.h

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