Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

[linux-2.6-microblaze.git] / arch / powerpc / include / asm / uaccess.h

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 604d705..916daa4 100644 (file)
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -8,62 +8,21 @@
 #include <asm/extable.h>
 #include <asm/kup.h>
 
-/*
- * The fs value determines whether argument validity checking should be
- * performed or not.  If get_fs() == USER_DS, checking is performed, with
- * get_fs() == KERNEL_DS, checking is bypassed.
- *
- * For historical reasons, these macros are grossly misnamed.
- *
- * The fs/ds values are now the highest legal address in the "segment".
- * This simplifies the checking in the routines below.
- */
-
-#define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
-
-#define KERNEL_DS      MAKE_MM_SEG(~0UL)
 #ifdef __powerpc64__
 /* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
-#define USER_DS                MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
+#define TASK_SIZE_MAX          TASK_SIZE_USER64
 #else
-#define USER_DS                MAKE_MM_SEG(TASK_SIZE - 1)
+#define TASK_SIZE_MAX          TASK_SIZE
 #endif
 
-#define get_fs()       (current->thread.addr_limit)
-
-static inline void set_fs(mm_segment_t fs)
+static inline bool __access_ok(unsigned long addr, unsigned long size)
 {
-       current->thread.addr_limit = fs;
-       /* On user-mode return check addr_limit (fs) is correct */
-       set_thread_flag(TIF_FSCHECK);
+       return addr < TASK_SIZE_MAX && size <= TASK_SIZE_MAX - addr;
 }
 
-#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
-#define user_addr_max()        (get_fs().seg)
-
-#ifdef __powerpc64__
-/*
- * This check is sufficient because there is a large enough
- * gap between user addresses and the kernel addresses
- */
-#define __access_ok(addr, size, segment)       \
-       (((addr) <= (segment).seg) && ((size) <= (segment).seg))
-
-#else
-
-static inline int __access_ok(unsigned long addr, unsigned long size,
-                       mm_segment_t seg)
-{
-       if (addr > seg.seg)
-               return 0;
-       return (size == 0 || size - 1 <= seg.seg - addr);
-}
-
-#endif
-
 #define access_ok(addr, size)          \
        (__chk_user_ptr(addr),          \
-        __access_ok((__force unsigned long)(addr), (size), get_fs()))
+        __access_ok((unsigned long)(addr), (size)))
 
 /*
  * These are the main single-value transfer routines.  They automatically
@@ -604,4 +563,20 @@ do {                                                                       \
                __put_user_goto(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e);\
 } while (0)
 
+#define HAVE_GET_KERNEL_NOFAULT
+
+#define __get_kernel_nofault(dst, src, type, err_label)                        \
+do {                                                                   \
+       int __kr_err;                                                   \
+                                                                       \
+       __get_user_size_allowed(*((type *)(dst)), (__force type __user *)(src),\
+                       sizeof(type), __kr_err);                        \
+       if (unlikely(__kr_err))                                         \
+               goto err_label;                                         \
+} while (0)
+
+#define __put_kernel_nofault(dst, src, type, err_label)                        \
+       __put_user_size_goto(*((type *)(src)),                          \
+               (__force type __user *)(dst), sizeof(type), err_label)
+
 #endif /* _ARCH_POWERPC_UACCESS_H */