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Commit 8d1c50c8 authored by Yang Xu's avatar Yang Xu Committed by Greg Kroah-Hartman
Browse files

selftests/zram: Skip max_comp_streams interface on newer kernel 



[ Upstream commit fc4eb486a59d70bd35cf1209f0e68c2d8b979193 ]

Since commit 43209ea2 ("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: default avatarYang Xu <xuyang2018.jy@fujitsu.com>
Signed-off-by: default avatarShuah Khan <skhan@linuxfoundation.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 455ef08d

tools/testing/selftests/zram/zram_lib.sh

+24 −0
Original line number Diff line number Diff line
@@ -11,6 +11,9 @@ 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
@@ -25,6 +28,20 @@ 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"
@@ -86,6 +103,13 @@ 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"