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selftests/livepatch: wait for atomic replace to occur

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On some machines with a large number of CPUs there is a sizable delay
between an atomic replace occurring and when sysfs updates accordingly.
This fix uses 'loop_until' to wait for the atomic replace to unload all
previous livepatches.

Reported-by: CKI Project <cki-project@redhat.com>
Closes: https://datawarehouse.cki-project.org/kcidb/tests/redhat:1413102084-x86_64-kernel_upt_28
Signed-off-by: Ryan Sullivan <rysulliv@redhat.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Link: https://lore.kernel.org/r/20240822173122.14760-1-rysulliv@redhat.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Ryan Sullivan 2024-08-22 13:31:22 -04:00 committed by Petr Mladek
parent d2d721e2eb
commit 052f395164
1 changed files with 2 additions and 5 deletions
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7
tools/testing/selftests/livepatch/test-livepatch.sh
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@ -139,11 +139,8 @@ load_lp $MOD_REPLACE replace=1
grep 'live patched' /proc/cmdline > /dev/kmsg
grep 'live patched' /proc/meminfo > /dev/kmsg
mods=(/sys/kernel/livepatch/*)
nmods=${#mods[@]}
if [ "$nmods" -ne 1 ]; then
die "Expecting only one moduled listed, found $nmods"
fi
loop_until 'mods=(/sys/kernel/livepatch/*); nmods=${#mods[@]}; [[ "$nmods" -eq 1 ]]' ||
die "Expecting only one moduled listed, found $nmods"
# These modules were disabled by the atomic replace
for mod in $MOD_LIVEPATCH3 $MOD_LIVEPATCH2 $MOD_LIVEPATCH1; do