selftests/mm: skip hugevm test if kernel config file is not present

When running hugevm tests in a machine without kernel config present,
e.g., a VM running a kernel without CONFIG_IKCONFIG_PROC nor
/boot/config-*, skip hugevm tests, which reads kernel config to get page
table level information.

Link: https://lkml.kernel.org/r/20250516132938.356627-3-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Adam Sindelar <adam@wowsignal.io>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/tools/testing/selftests/mm/va_high_addr_switch.sh b/tools/testing/selftests/mm/va_high_addr_switch.sh
index 1f92e8caceaceb5544eaf2d4bda2916b79a09146..325de53966b6dca0a67aae6496bc5e18489a0ace 100755 (executable)
--- a/tools/testing/selftests/mm/va_high_addr_switch.sh
+++ b/tools/testing/selftests/mm/va_high_addr_switch.sh
@@ -7,23 +7,20 @@
 # real test to check that the kernel is configured to support at least 5
 # pagetable levels.
 
-# 1 means the test failed
-exitcode=1
-
 # Kselftest framework requirement - SKIP code is 4.
 ksft_skip=4
 
-fail()
+skip()
 {
        echo "$1"
-       exit $exitcode
+       exit $ksft_skip
 }
 
 check_supported_x86_64()
 {
        local config="/proc/config.gz"
        [[ -f "${config}" ]] || config="/boot/config-$(uname -r)"
-       [[ -f "${config}" ]] || fail "Cannot find kernel config in /proc or /boot"
+       [[ -f "${config}" ]] || skip "Cannot find kernel config in /proc or /boot"
 
        # gzip -dcfq automatically handles both compressed and plaintext input.
        # See man 1 gzip under '-f'.
@@ -33,11 +30,9 @@ check_supported_x86_64()
                else {print 1}; exit}' /proc/cpuinfo 2>/dev/null)
 
        if [[ "${pg_table_levels}" -lt 5 ]]; then
-               echo "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
-               exit $ksft_skip
+               skip "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
        elif [[ "${cpu_supports_pl5}" -ne 0 ]]; then
-               echo "$0: CPU does not have the necessary la57 flag to support page table level 5"
-               exit $ksft_skip
+               skip "$0: CPU does not have the necessary la57 flag to support page table level 5"
        fi
 }
 
@@ -45,24 +40,21 @@ check_supported_ppc64()
 {
        local config="/proc/config.gz"
        [[ -f "${config}" ]] || config="/boot/config-$(uname -r)"
-       [[ -f "${config}" ]] || fail "Cannot find kernel config in /proc or /boot"
+       [[ -f "${config}" ]] || skip "Cannot find kernel config in /proc or /boot"
 
        local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2)
        if [[ "${pg_table_levels}" -lt 5 ]]; then
-               echo "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
-               exit $ksft_skip
+               skip "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
        fi
 
        local mmu_support=$(grep -m1 "mmu" /proc/cpuinfo | awk '{print $3}')
        if [[ "$mmu_support" != "radix" ]]; then
-               echo "$0: System does not use Radix MMU, required for 5-level paging"
-               exit $ksft_skip
+               skip "$0: System does not use Radix MMU, required for 5-level paging"
        fi
 
        local hugepages_total=$(awk '/HugePages_Total/ {print $2}' /proc/meminfo)
        if [[ "${hugepages_total}" -eq 0 ]]; then
-               echo "$0: HugePages are not enabled, required for some tests"
-               exit $ksft_skip
+               skip "$0: HugePages are not enabled, required for some tests"
        fi
 }