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Commit059342d1dd("mm/damon/reclaim: fix the timer always stays active") made DAMON_RECLAIM's 'enabled' parameter store callback, 'enabled_store()', to schedule 'damon_reclaim_timer'. The scheduling uses 'system_wq', which is initialized in 'workqueue_init_early()'. As kernel parameters parsing function ('parse_args()') is called before 'workqueue_init_early()', 'enabled_store()' can be executed before 'workqueue_init_early()' and end up accessing the uninitialized 'system_wq'. As a result, the booting hang[1]. This commit fixes the issue by checking if the initialization is done before scheduling the timer. [1] https://lkml.kernel.org/20220604192222.1488-1-sj@kernel.org/ Link: https://lkml.kernel.org/r/20220604195051.1589-1-sj@kernel.org Fixes:059342d1dd("mm/damon/reclaim: fix the timer always stays active") Signed-off-by: SeongJae Park <sj@kernel.org> Reported-by: Greg White <gwhite@kupulau.com> Cc: Hailong Tu <tuhailong@gmail.com> 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 Restructured Text 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.