diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/hugetlb.h | 7 | ||||
| -rw-r--r-- | include/linux/shm.h | 15 | ||||
| -rw-r--r-- | include/uapi/asm-generic/mman-common.h | 11 | ||||
| -rw-r--r-- | include/uapi/asm-generic/mman.h | 2 |
4 files changed, 33 insertions, 2 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 2251648..3e7fa1a 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -183,7 +183,8 @@ extern const struct file_operations hugetlbfs_file_operations; extern const struct vm_operations_struct hugetlb_vm_ops; struct file *hugetlb_file_setup(const char *name, unsigned long addr, size_t size, vm_flags_t acct, - struct user_struct **user, int creat_flags); + struct user_struct **user, int creat_flags, + int page_size_log); static inline int is_file_hugepages(struct file *file) { @@ -195,12 +196,14 @@ static inline int is_file_hugepages(struct file *file) return 0; } + #else /* !CONFIG_HUGETLBFS */ #define is_file_hugepages(file) 0 static inline struct file * hugetlb_file_setup(const char *name, unsigned long addr, size_t size, - vm_flags_t acctflag, struct user_struct **user, int creat_flags) + vm_flags_t acctflag, struct user_struct **user, int creat_flags, + int page_size_log) { return ERR_PTR(-ENOSYS); } diff --git a/include/linux/shm.h b/include/linux/shm.h index bcf8a6a..429c199 100644 --- a/include/linux/shm.h +++ b/include/linux/shm.h @@ -29,6 +29,21 @@ struct shmid_kernel /* private to the kernel */ #define SHM_HUGETLB 04000 /* segment will use huge TLB pages */ #define SHM_NORESERVE 010000 /* don't check for reservations */ +/* Bits [26:31] are reserved */ + +/* + * When SHM_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 SHM_HUGE_SHIFT 26 +#define SHM_HUGE_MASK 0x3f +#define SHM_HUGE_2MB (21 << SHM_HUGE_SHIFT) +#define SHM_HUGE_1GB (30 << SHM_HUGE_SHIFT) + #ifdef CONFIG_SYSVIPC long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr, unsigned long shmlba); diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h index d030d2c..4164529 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 32c8bd6..e9fe6fd 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 */ |