Merge commit 'v2.6.28-rc7' into core/locking

[sfrench/cifs-2.6.git] / include / linux / uaccess.h

diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 76c3fe325101cc90660af3ee05902a02359633c7..6b58367d145e8735eaebbf16bfec0733406389fb 100644 (file)
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -78,10 +78,32 @@ static inline unsigned long __copy_from_user_nocache(void *to,
                                                        \
                set_fs(KERNEL_DS);                      \
                pagefault_disable();                    \
-               ret = __get_user(retval, addr);         \
+               ret = __copy_from_user_inatomic(&(retval), (__force typeof(retval) __user *)(addr), sizeof(retval));            \
                pagefault_enable();                     \
                set_fs(old_fs);                         \
                ret;                                    \
        })
 
+/*
+ * probe_kernel_read(): safely attempt to read from a location
+ * @dst: pointer to the buffer that shall take the data
+ * @src: address to read from
+ * @size: size of the data chunk
+ *
+ * Safely read from address @src to the buffer at @dst.  If a kernel fault
+ * happens, handle that and return -EFAULT.
+ */
+extern long probe_kernel_read(void *dst, void *src, size_t size);
+
+/*
+ * probe_kernel_write(): safely attempt to write to a location
+ * @dst: address to write to
+ * @src: pointer to the data that shall be written
+ * @size: size of the data chunk
+ *
+ * Safely write to address @dst from the buffer at @src.  If a kernel fault
+ * happens, handle that and return -EFAULT.
+ */
+extern long probe_kernel_write(void *dst, void *src, size_t size);
+
 #endif         /* __LINUX_UACCESS_H__ */