[ndctl PATCH] ndctl, test: make btt-pad-compat dynamically detect a patched kernel

From: Vishal Verma <vishal.l.verma@intel.com>
To: linux-nvdimm@lists.01.org
Subject: [ndctl PATCH] ndctl, test: make btt-pad-compat dynamically detect a patched kernel
Date: Fri,  2 Feb 2018 15:36:59 -0700	[thread overview]
Message-ID: <20180202223659.28413-1-vishal.l.verma@intel.com> (raw)

The btt-pad-compat test can detect whether it is running on a patched
kernel by checking for the two newly added debugfs files in the fix for
this bug. Use that instead of hard coding a kernel version dependency.

Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
 test/btt-pad-compat.sh | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/test/btt-pad-compat.sh b/test/btt-pad-compat.sh
index d10efe3..faa773c 100755
--- a/test/btt-pad-compat.sh
+++ b/test/btt-pad-compat.sh
@@ -41,17 +41,6 @@ err()
 	exit "$rc"
 }
 
-check_min_kver()
-{
-	local ver="$1"
-	: "${KVER:=$(uname -r)}"
-
-	[ -n "$ver" ] || return 1
-	[[ "$ver" == "$(echo -e "$ver\n$KVER" | sort -V | head -1)" ]]
-}
-
-check_min_kver "4.15" || { echo "kernel $KVER may not have btt padding compat fixes"; exit "$rc"; }
-
 check_prereq()
 {
 	if ! command -v "$1" >/dev/null; then
@@ -70,6 +59,10 @@ create()
 	[ $size -gt 0 ] || err "$LINENO" 2
 	bttdev=$(cat /sys/bus/nd/devices/$dev/holder)
 	[ -n "$bttdev" ] || err "$LINENO" 2
+	if [ ! -e /sys/kernel/debug/btt/$bttdev/arena0/log_index_0 ]; then
+		echo "kernel $(uname -r) seems to be missing the BTT compatibility fixes, skipping"
+		exit 77
+	fi
 }
 
 reset()
-- 
2.14.3

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