Add build system

[zfs.git] / config / kernel-blk-end-request.m4

diff --git a/config/kernel-blk-end-request.m4 b/config/kernel-blk-end-request.m4
new file mode 100644 (file)
index 0000000..20ad1a9
--- /dev/null
+++ b/config/kernel-blk-end-request.m4
@@ -0,0 +1,37 @@
+dnl #
+dnl # 2.6.31 API change
+dnl # In 2.6.29 kernels blk_end_request() was a GPL-only symbol, this was
+dnl # changed in 2.6.31 so it may be used by non-GPL modules.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BLK_END_REQUEST], [
+       AC_MSG_CHECKING([whether blk_end_request() is available])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/blkdev.h>
+       ],[
+               struct request *req = NULL;
+               (void) blk_end_request(req, 0, 0);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_BLK_END_REQUEST, 1,
+                         [blk_end_request() is available])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+
+       AC_MSG_CHECKING([whether blk_end_request() is GPL-only])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/module.h>
+               #include <linux/blkdev.h>
+               
+               MODULE_LICENSE("CDDL");
+       ],[
+               struct request *req = NULL;
+               (void) blk_end_request(req, 0, 0);
+       ],[
+               AC_MSG_RESULT(no)
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_BLK_END_REQUEST_GPL_ONLY, 1,
+                         [blk_end_request() is GPL-only])
+       ])
+])