2 # SPDX-License-Identifier: GPL-2.0
4 # Copyright (C) 2022 Adam Sindelar (Meta) <adam@wowsignal.io>
6 # This is a test for mmap behavior with 5-level paging. This script wraps the
7 # real test to check that the kernel is configured to support at least 5
10 # 1 means the test failed
13 # Kselftest framework requirement - SKIP code is 4.
22 check_supported_x86_64()
24 local config="/proc/config.gz"
25 [[ -f "${config}" ]] || config="/boot/config-$(uname -r)"
26 [[ -f "${config}" ]] || fail "Cannot find kernel config in /proc or /boot"
28 # gzip -dcfq automatically handles both compressed and plaintext input.
29 # See man 1 gzip under '-f'.
30 local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2)
32 if [[ "${pg_table_levels}" -lt 5 ]]; then
33 echo "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
38 check_test_requirements()
40 # The test supports x86_64 and powerpc64. We currently have no useful
41 # eligibility check for powerpc64, and the test itself will reject other
45 check_supported_x86_64
53 check_test_requirements