linux-kernel - [PATCH] selftests/mm: Update va_high_addr

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Date: Fri, 19 Jan 2024 15:58:01 -0500
From: Audra Mitchell <audra@...hat.com>
To: shuah@...nel.org
Cc: akpm@...ux-foundation.org,
	linux-kselftest@...r.kernel.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	raquini@...hat.com
Subject: [PATCH] selftests/mm: Update va_high_addr_switch.sh to check CPU for la57 flag

In order for the page table level 5 to be in use, the CPU must have the
setting enabled in addition to the CONFIG option. Check for the flag to be
set to avoid false test failures on systems that do not have this cpu flag
set.

Signed-off-by: Audra Mitchell <audra@...hat.com>
---
 tools/testing/selftests/mm/va_high_addr_switch.sh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/mm/va_high_addr_switch.sh b/tools/testing/selftests/mm/va_high_addr_switch.sh
index 45cae7cab27e..a0a75f302904 100755
--- a/tools/testing/selftests/mm/va_high_addr_switch.sh
+++ b/tools/testing/selftests/mm/va_high_addr_switch.sh
@@ -29,9 +29,15 @@ check_supported_x86_64()
 	# See man 1 gzip under '-f'.
 	local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2)
 
+	local cpu_supports_pl5=$(awk '/^flags/ {if (/la57/) {print 0;}
+		else {print 1}; exit}' /proc/cpuinfo 2>/dev/null)
+
 	if [[ "${pg_table_levels}" -lt 5 ]]; then
 		echo "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
 		exit $ksft_skip
+	elif [[ "${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
 	fi
 }
 
-- 
2.43.0