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A non-default huge page size can be encoded in the flags argument of the mmap system call. The definitions for these encodings are in arch specific header files. However, all architectures use the same values. Consolidate all the definitions in the primary user header file (uapi/linux/mman.h). Include definitions for all known huge page sizes. Use the generic encoding definitions in hugetlb_encode.h as the basis for these definitions. Link: http://lkml.kernel.org/r/1501527386-10736-3-git-send-email-mike.kravetz@oracle.com Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
30 lines
939 B
C
30 lines
939 B
C
#ifndef _ASM_X86_MMAN_H
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#define _ASM_X86_MMAN_H
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#define MAP_32BIT 0x40 /* only give out 32bit addresses */
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#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
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/*
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* Take the 4 protection key bits out of the vma->vm_flags
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* value and turn them in to the bits that we can put in
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* to a pte.
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*
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* Only override these if Protection Keys are available
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* (which is only on 64-bit).
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*/
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#define arch_vm_get_page_prot(vm_flags) __pgprot( \
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((vm_flags) & VM_PKEY_BIT0 ? _PAGE_PKEY_BIT0 : 0) | \
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((vm_flags) & VM_PKEY_BIT1 ? _PAGE_PKEY_BIT1 : 0) | \
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((vm_flags) & VM_PKEY_BIT2 ? _PAGE_PKEY_BIT2 : 0) | \
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((vm_flags) & VM_PKEY_BIT3 ? _PAGE_PKEY_BIT3 : 0))
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#define arch_calc_vm_prot_bits(prot, key) ( \
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((key) & 0x1 ? VM_PKEY_BIT0 : 0) | \
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((key) & 0x2 ? VM_PKEY_BIT1 : 0) | \
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((key) & 0x4 ? VM_PKEY_BIT2 : 0) | \
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((key) & 0x8 ? VM_PKEY_BIT3 : 0))
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#endif
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#include <asm-generic/mman.h>
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#endif /* _ASM_X86_MMAN_H */
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