These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / include / linux / uaccess.h

diff --git a/kernel/include/linux/uaccess.h b/kernel/include/linux/uaccess.h
index 941b2da..cf5c472 100644 (file)
--- a/kernel/include/linux/uaccess.h
+++ b/kernel/include/linux/uaccess.h
@@ -77,36 +77,6 @@ static inline unsigned long __copy_from_user_nocache(void *to,
 
 #endif         /* ARCH_HAS_NOCACHE_UACCESS */
 
-/**
- * probe_kernel_address(): safely attempt to read from a location
- * @addr: address to read from - its type is type typeof(retval)*
- * @retval: read into this variable
- *
- * Safely read from address @addr into variable @revtal.  If a kernel fault
- * happens, handle that and return -EFAULT.
- * We ensure that the __get_user() is executed in atomic context so that
- * do_page_fault() doesn't attempt to take mmap_sem.  This makes
- * probe_kernel_address() suitable for use within regions where the caller
- * already holds mmap_sem, or other locks which nest inside mmap_sem.
- * This must be a macro because __get_user() needs to know the types of the
- * args.
- *
- * We don't include enough header files to be able to do the set_fs().  We
- * require that the probe_kernel_address() caller will do that.
- */
-#define probe_kernel_address(addr, retval)             \
-       ({                                              \
-               long ret;                               \
-               mm_segment_t old_fs = get_fs();         \
-                                                       \
-               set_fs(KERNEL_DS);                      \
-               pagefault_disable();                    \
-               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
@@ -131,4 +101,16 @@ extern long __probe_kernel_read(void *dst, const void *src, size_t size);
 extern long notrace probe_kernel_write(void *dst, const void *src, size_t size);
 extern long notrace __probe_kernel_write(void *dst, const void *src, size_t size);
 
+extern long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count);
+
+/**
+ * probe_kernel_address(): safely attempt to read from a location
+ * @addr: address to read from
+ * @retval: read into this variable
+ *
+ * Returns 0 on success, or -EFAULT.
+ */
+#define probe_kernel_address(addr, retval)             \
+       probe_kernel_read(&retval, addr, sizeof(retval))
+
 #endif         /* __LINUX_UACCESS_H__ */