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Message-Id: <20220221084908.832464802@linuxfoundation.org>
Date: Mon, 21 Feb 2022 09:49:01 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Yang Xu <xuyang2018.jy@...itsu.com>,
Shuah Khan <skhan@...uxfoundation.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 08/33] selftests/zram: Skip max_comp_streams interface on newer kernel
From: Yang Xu <xuyang2018.jy@...itsu.com>
[ Upstream commit fc4eb486a59d70bd35cf1209f0e68c2d8b979193 ]
Since commit 43209ea2d17a ("zram: remove max_comp_streams internals"), zram
has switched to per-cpu streams. Even kernel still keep this interface for
some reasons, but writing to max_comp_stream doesn't take any effect. So
skip it on newer kernel ie 4.7.
The code that comparing kernel version is from xfstests testsuite ext4/053.
Signed-off-by: Yang Xu <xuyang2018.jy@...itsu.com>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
tools/testing/selftests/zram/zram_lib.sh | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/tools/testing/selftests/zram/zram_lib.sh b/tools/testing/selftests/zram/zram_lib.sh
index 9e73a4fb9b0aa..2c1d1c567f854 100755
--- a/tools/testing/selftests/zram/zram_lib.sh
+++ b/tools/testing/selftests/zram/zram_lib.sh
@@ -20,6 +20,9 @@ dev_mounted=-1
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
+kernel_version=`uname -r | cut -d'.' -f1,2`
+kernel_major=${kernel_version%.*}
+kernel_minor=${kernel_version#*.}
trap INT
@@ -34,6 +37,20 @@ check_prereqs()
fi
}
+kernel_gte()
+{
+ major=${1%.*}
+ minor=${1#*.}
+
+ if [ $kernel_major -gt $major ]; then
+ return 0
+ elif [[ $kernel_major -eq $major && $kernel_minor -ge $minor ]]; then
+ return 0
+ fi
+
+ return 1
+}
+
zram_cleanup()
{
echo "zram cleanup"
@@ -95,6 +112,13 @@ zram_max_streams()
{
echo "set max_comp_streams to zram device(s)"
+ kernel_gte 4.7
+ if [ $? -eq 0 ]; then
+ echo "The device attribute max_comp_streams was"\
+ "deprecated in 4.7"
+ return 0
+ fi
+
local i=0
for max_s in $zram_max_streams; do
local sys_path="/sys/block/zram${i}/max_comp_streams"
--
2.34.1
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