mm: do not call mem_cgroup_free() from within mem_cgroup_alloc()
mem_cgroup_free() indirectly calls wb_domain_exit() which is not
prepared to deal with a struct wb_domain object that hasn't executed
wb_domain_init(). For instance, the following warning message is
printed by lockdep if alloc_percpu() fails in mem_cgroup_alloc():
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 1 PID: 1950 Comm: mkdir Not tainted 4.10.0+ #151
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
dump_stack+0x67/0x99
register_lock_class+0x36d/0x540
__lock_acquire+0x7f/0x1a30
lock_acquire+0xcc/0x200
del_timer_sync+0x3c/0xc0
wb_domain_exit+0x14/0x20
mem_cgroup_free+0x14/0x40
mem_cgroup_css_alloc+0x3f9/0x620
cgroup_apply_control_enable+0x190/0x390
cgroup_mkdir+0x290/0x3d0
kernfs_iop_mkdir+0x58/0x80
vfs_mkdir+0x10e/0x1a0
SyS_mkdirat+0xa8/0xd0
SyS_mkdir+0x14/0x20
entry_SYSCALL_64_fastpath+0x18/0xad
Add __mem_cgroup_free() which skips wb_domain_exit(). This is used by
both mem_cgroup_free() and mem_cgroup_alloc() clean up.
Fixes: 0b8f73e104
("mm: memcontrol: clean up alloc, online, offline, free functions")
Link: http://lkml.kernel.org/r/20170306192122.24262-1-tahsin@google.com
Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
6ebb4a1b84
commit
40e952f9d6
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@ -4138,17 +4138,22 @@ static void free_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
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kfree(memcg->nodeinfo[node]);
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kfree(memcg->nodeinfo[node]);
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}
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}
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static void mem_cgroup_free(struct mem_cgroup *memcg)
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static void __mem_cgroup_free(struct mem_cgroup *memcg)
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{
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{
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int node;
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int node;
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memcg_wb_domain_exit(memcg);
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for_each_node(node)
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for_each_node(node)
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free_mem_cgroup_per_node_info(memcg, node);
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free_mem_cgroup_per_node_info(memcg, node);
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free_percpu(memcg->stat);
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free_percpu(memcg->stat);
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kfree(memcg);
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kfree(memcg);
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}
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}
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static void mem_cgroup_free(struct mem_cgroup *memcg)
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{
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memcg_wb_domain_exit(memcg);
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__mem_cgroup_free(memcg);
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}
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static struct mem_cgroup *mem_cgroup_alloc(void)
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static struct mem_cgroup *mem_cgroup_alloc(void)
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{
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{
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struct mem_cgroup *memcg;
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struct mem_cgroup *memcg;
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@ -4199,7 +4204,7 @@ static struct mem_cgroup *mem_cgroup_alloc(void)
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fail:
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fail:
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if (memcg->id.id > 0)
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if (memcg->id.id > 0)
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idr_remove(&mem_cgroup_idr, memcg->id.id);
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idr_remove(&mem_cgroup_idr, memcg->id.id);
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mem_cgroup_free(memcg);
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__mem_cgroup_free(memcg);
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return NULL;
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return NULL;
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}
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}
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