diff options
Diffstat (limited to 'arch/ia64/include/asm/uaccess.h')
| -rw-r--r-- | arch/ia64/include/asm/uaccess.h | 26 |
1 files changed, 8 insertions, 18 deletions
diff --git a/arch/ia64/include/asm/uaccess.h b/arch/ia64/include/asm/uaccess.h index e19d2dcc0ced..60adadeb3e9e 100644 --- a/arch/ia64/include/asm/uaccess.h +++ b/arch/ia64/include/asm/uaccess.h @@ -42,30 +42,20 @@ #include <asm/extable.h> /* - * For historical reasons, the following macros are grossly misnamed: - */ -#define KERNEL_DS ((mm_segment_t) { ~0UL }) /* cf. access_ok() */ -#define USER_DS ((mm_segment_t) { TASK_SIZE-1 }) /* cf. access_ok() */ - -#define get_fs() (current_thread_info()->addr_limit) -#define set_fs(x) (current_thread_info()->addr_limit = (x)) - -#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg) - -/* - * When accessing user memory, we need to make sure the entire area really is in - * user-level space. In order to do this efficiently, we make sure that the page at - * address TASK_SIZE is never valid. We also need to make sure that the address doesn't + * When accessing user memory, we need to make sure the entire area really is + * in user-level space. We also need to make sure that the address doesn't * point inside the virtually mapped linear page table. */ static inline int __access_ok(const void __user *p, unsigned long size) { + unsigned long limit = TASK_SIZE; unsigned long addr = (unsigned long)p; - unsigned long seg = get_fs().seg; - return likely(addr <= seg) && - (seg == KERNEL_DS.seg || likely(REGION_OFFSET(addr) < RGN_MAP_LIMIT)); + + return likely((size <= limit) && (addr <= (limit - size)) && + likely(REGION_OFFSET(addr) < RGN_MAP_LIMIT)); } -#define access_ok(addr, size) __access_ok((addr), (size)) +#define __access_ok __access_ok +#include <asm-generic/access_ok.h> /* * These are the main single-value transfer routines. They automatically |