Linux 5.0 compat: access_ok() drops 'type' parameter

[mirror_zfs.git] / config / kernel-access-ok-type.m4

diff --git a/config/kernel-access-ok-type.m4 b/config/kernel-access-ok-type.m4
new file mode 100644 (file)
index 0000000..3b2878a
--- /dev/null
+++ b/config/kernel-access-ok-type.m4
@@ -0,0 +1,21 @@
+dnl #
+dnl # Linux 5.0: access_ok() drops 'type' parameter:
+dnl #
+dnl # - access_ok(type, addr, size)
+dnl # + access_ok(addr, size)
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_ACCESS_OK_TYPE], [
+       AC_MSG_CHECKING([whether access_ok() has 'type' parameter])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/uaccess.h>
+       ],[
+               const void __user __attribute__((unused)) *addr = (void *) 0xdeadbeef;
+               unsigned long __attribute__((unused)) size = 1;
+               int error __attribute__((unused)) = access_ok(0, addr, size);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_ACCESS_OK_TYPE, 1, [kernel has access_ok with 'type' parameter])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])