kselftest: alloc_tag: add kselftest for ioctl interface

Introduce a kselftest to verify the new IOCTL-based interface for
/proc/allocinfo.  The test covers:

1. Validation of the filename filter.
2. Validation of the function filter.

The first test validates the functionality of the filename filter.  Using
"mm/memory.c" as the candidate filename filter, it retrieves filtered
entries from both procfs and ioctl and matches the first VEC_MAX_ENTRIES
entries.

The second test validates the functionality of the function filter.  It
uses "dup_mm" as the candidate function as we do not expect this function
name to change frequently and hence won't be needing to modify this test
often.

Note that both the tests match line no, function name and file name
fields.  Bytes allocated and calls are not matched as those values may
change in the time when the data is being read from procfs and ioctl and
hence can lead to false negatives.

[abhishekbapat@google.com: fix a typo in the selftest]
  Link: https://lore.kernel.org/e4e49ec4a5960292aeeb9e196526c18dc95228a2.1785867739.git.abhishekbapat@google.com
  Closes: https://sashiko.dev/#/patchset/cover.1783532853.git.abhishekbapat@google.com
Link: https://lore.kernel.org/e2a3795677a14aeab249758ba570cd5e98402032.1783532853.git.abhishekbapat@google.com
Signed-off-by: Abhishek Bapat <abhishekbapat@google.com>
Tested-by: Hao Ge <hao.ge@linux.dev>
Acked-by: Hao Ge <hao.ge@linux.dev>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Sourav Panda <souravpanda@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions