selftests/damon: test debugfs file reads/writes with huge count

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DAMON debugfs interface users were able to trigger warning by writing
some files with arbitrarily large 'count' parameter.  The issue is fixed
with commit db7a347b26 ("mm/damon/dbgfs: use '__GFP_NOWARN' for
user-specified size buffer allocation").  This commit adds a test case
for the issue in DAMON selftests to avoid future regressions.

Link: https://lkml.kernel.org/r/20211201150440.1088-11-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

...

This commit is contained in:

SeongJae Park 2021-12-10 14:46:55 -08:00 • committed by Linus Torvalds

parent d85570c655

commit b4a002889d

4 changed files with 61 additions and 0 deletions

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2

tools/testing/selftests/damon/.gitignore vendored

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tools/testing/selftests/damon/Makefile

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tools/testing/selftests/damon/debugfs_attrs.sh

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39

tools/testing/selftests/damon/huge_count_read_write.c

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