From: Yang Xu xuyang2018.jy@fujitsu.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@fujitsu.com Signed-off-by: Shuah Khan skhan@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.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"