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Filtering decisions are made in filters evaluation order. Once a decision
is made by a filter, filters that scheduled to be evaluated after the
decision-made filter should just respect it. This is the intended and
documented behavior. Since core layer-handled filters are evaluated
before operations layer-handled filters, decisions made on core layer
should respected by ops layer.
In case of reject filters, the decision is respected, since core
layer-rejected regions are not passed to ops layer. But in case of allow
filters, ops layer filters don't know if the region has passed to them
because it was allowed by core filters or just because it didn't match to
any core layer. The current wrong implementation assumes it was due to
not matched by any core filters. As a reuslt, the decision is not
respected. Pass the missing information to ops layer using a new filed in
'struct damos', and make the ops layer filters respect it.
Link: https://lkml.kernel.org/r/20250228175336.42781-1-sj@kernel.org
Fixes: 491fee286e ("mm/damon/core: support damos_filter->allow")
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.