Hello Christoph Hellwig,
The patch 27b642b07a4a: "blk-cgroup: simplify blkg freeing from
initialization failure paths" from Feb 3, 2023, leads to the
following Smatch static checker warning:
block/blk-cgroup.c:762 blkg_conf_prep() warn: sleeping in atomic context
block/blk-cgroup.c:769 blkg_conf_prep() warn: sleeping in atomic context
blkg_conf_prep()
[ takes a lock and calls blkg_free() in the same function. ]
block/blk-cgroup.c:387 blkg_create() warn: sleeping in atomic context
blkg_lookup_create() <- disables preempt
blkg_conf_prep() <- disables preempt
blkcg_init_disk() <- disables preempt
-> blkg_create()
[ The first call tree is a false positive but blkg_conf_prep()
and blkcg_init_disk() have issues. ]
regards,
dan carpenter
