SeongJae Park 2949282938 mm/damon/reclaim: schedule 'damon_reclaim_timer' only after 'system_wq' is initialized ... Commit 059342d1dd ("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>		2022-06-16 19:11:30 -07:00
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Kconfig	mm/damon: implement a minimal stub for sysfs-based DAMON interface	2022-03-22 15:57:13 -07:00
Makefile	mm/damon: implement a minimal stub for sysfs-based DAMON interface	2022-03-22 15:57:13 -07:00
core-test.h	mm/damon/core-test: add a kunit test case for ops registration	2022-04-29 14:37:00 -07:00
core.c	mm/damon/vaddr: move 'damon_set_regions()' to core	2022-05-13 07:20:08 -07:00
dbgfs-test.h	mm/damon/dbgfs-test: fix is_target_id() change	2022-03-22 15:57:12 -07:00
dbgfs.c	mm/damon/core: allow non-exclusive DAMON start/stop	2022-03-22 15:57:13 -07:00
ops-common.c	mm: damon: use HPAGE_PMD_SIZE	2022-05-19 14:08:55 -07:00
ops-common.h	mm/damon: rename damon_primitives to damon_operations	2022-03-22 15:57:12 -07:00
paddr.c	mm: damon: use HPAGE_PMD_SIZE	2022-05-19 14:08:55 -07:00
reclaim.c	mm/damon/reclaim: schedule 'damon_reclaim_timer' only after 'system_wq' is initialized	2022-06-16 19:11:30 -07:00
sysfs.c	mm/damon/sysfs: support online inputs update	2022-05-13 07:20:09 -07:00
vaddr-test.h	mm/damon/vaddr: remove damon_va_apply_three_regions()	2022-05-13 07:20:08 -07:00
vaddr.c	mm: damon: use HPAGE_PMD_SIZE	2022-05-19 14:08:55 -07:00