diff options
Diffstat (limited to 'include/uapi/asm-generic')
| -rw-r--r-- | include/uapi/asm-generic/mman-common.h | 11 | ||||
| -rw-r--r-- | include/uapi/asm-generic/mman.h | 2 |
2 files changed, 13 insertions, 0 deletions
diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h index d030d2c2647a..4164529a94f9 100644 --- a/include/uapi/asm-generic/mman-common.h +++ b/include/uapi/asm-generic/mman-common.h @@ -55,4 +55,15 @@ /* compatibility flags */ #define MAP_FILE 0 +/* + * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. + * This gives us 6 bits, which is enough until someone invents 128 bit address + * spaces. + * + * Assume these are all power of twos. + * When 0 use the default page size. + */ +#define MAP_HUGE_SHIFT 26 +#define MAP_HUGE_MASK 0x3f + #endif /* __ASM_GENERIC_MMAN_COMMON_H */ diff --git a/include/uapi/asm-generic/mman.h b/include/uapi/asm-generic/mman.h index 32c8bd6a196d..e9fe6fd2a074 100644 --- a/include/uapi/asm-generic/mman.h +++ b/include/uapi/asm-generic/mman.h @@ -13,6 +13,8 @@ #define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */ #define MAP_HUGETLB 0x40000 /* create a huge page mapping */ +/* Bits [26:31] are reserved, see mman-common.h for MAP_HUGETLB usage */ + #define MCL_CURRENT 1 /* lock all current mappings */ #define MCL_FUTURE 2 /* lock all future mappings */ |