mirror_zfs/config/kernel-blk-fetch-request.m4
Brian Behlendorf c9c0d073da Add build system
Add autoconf style build infrastructure to the ZFS tree.  This
includes autogen.sh, configure.ac, m4 macros, some scripts/*,
and makefiles for all the core ZFS components.
2010-08-31 13:41:27 -07:00

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dnl #
dnl # 2.6.31 API change
dnl # Request queue peek/retrieval interface cleanup, the blk_fetch_request()
dnl # function replaces the elv_next_request() and blk_fetch_request()
dnl # functions. The updated blk_fetch_request() function returns the
dnl # next available request and removed it from the request queue.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BLK_FETCH_REQUEST], [
AC_MSG_CHECKING([whether blk_fetch_request() is available])
ZFS_LINUX_TRY_COMPILE([
#include <linux/blkdev.h>
],[
struct request_queue *q = NULL;
(void) blk_fetch_request(q);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BLK_FETCH_REQUEST, 1,
[blk_fetch_request() is available])
],[
AC_MSG_RESULT(no)
])
])