X-Git-Url: https://git.camperquake.de/gitweb.cgi?a=blobdiff_plain;f=config%2Fkernel-blk-queue-nonrot.m4;fp=config%2Fkernel-blk-queue-nonrot.m4;h=45d78f791f64b5ec0277b0f6fd3bbbf93820fdda;hb=34037afe24e0bff97cf5262f8f1a76f5e0815dc1;hp=0000000000000000000000000000000000000000;hpb=b18019d2d810585185493c62e9567fa85e51692c;p=zfs.git

diff --git a/config/kernel-blk-queue-nonrot.m4 b/config/kernel-blk-queue-nonrot.m4
new file mode 100644
index 0000000..45d78f7
--- /dev/null
+++ b/config/kernel-blk-queue-nonrot.m4
@@ -0,0 +1,25 @@
+dnl #
+dnl # 2.6.27 API change
+dnl # The blk_queue_nonrot() function and QUEUE_FLAG_NONROT flag were
+dnl # added so non-rotational devices could be identified.  These devices
+dnl # have no seek time which the higher level elevator uses to optimize
+dnl # how the I/O issued to the device.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_NONROT], [
+	AC_MSG_CHECKING([whether blk_queue_nonrot() is available])
+	tmp_flags="$EXTRA_KCFLAGS"
+	EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/blkdev.h>
+	],[
+		struct request_queue *q = NULL;
+		(void) blk_queue_nonrot(q);
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLK_QUEUE_NONROT, 1,
+		          [blk_queue_nonrot() is available])
+	],[
+		AC_MSG_RESULT(no)
+	])
+	EXTRA_KCFLAGS="$tmp_flags"
+])