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selftests/livepatch: Use "comm" instead of "diff" for dmesg

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BusyBox diff doesn't support the GNU diff '--LTYPE-line-format' options
that were used in the selftests to filter older kernel log messages from
dmesg output.

Use "comm" which is more available in smaller boot environments.

Reported-by: Naresh Kamboju <[email protected]>
Signed-off-by: Joe Lawrence <[email protected]>
Reviewed-by: Yannick Cote <[email protected]>
Reviewed-by: Kamalesh Babulal <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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Joe Lawrence authored and Petr Mladek committed 2020-07-14 09:32:27 +02:00
1 parent 3fd9bd8b7e
commit 2f3f651f37
1 file changed
+1 -1
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tools/testing/selftests/livepatch/functions.sh
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@@ -277,7 +277,7 @@ function check_result {
# help differentiate repeated testing runs. Remove them with a
# post-comparison sed filter.
result=$(dmesg | diff --changed-group-format='%>' --unchanged-group-format='' "$SAVED_DMESG" - | \
result=$(dmesg | comm -13 "$SAVED_DMESG" - | \
grep -e 'livepatch:' -e 'test_klp' | \
grep -v '\(tainting\|taints\) kernel' | \
sed 's/^\[[ 0-9.]*\] //')