Re: [PATCH v4 35/35] mm, slub: convert kmem_cpu_slab protection to local_lock
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: 2021-08-17 09:34:25
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On 2021-08-17 11:31:56 [+0200], Vlastimil Babka wrote:
On 8/17/21 11:12 AM, Sebastian Andrzej Siewior wrote:quoted
On 2021-08-17 10:37:48 [+0200], Vlastimil Babka wrote:quoted
OK reproduced. Thanks, will investigate.With the local_lock at the top, the needed alignment gets broken for dbl cmpxchg.Right. I wondered why the checks in __pcpu_double_call_return_bool didn't trigger. They are VM_BUG_ON() so they did trigger after enabling DEBUG_VM.
Without the right debugging enabled
| typedef struct {
| #ifdef CONFIG_DEBUG_LOCK_ALLOC
| struct lockdep_map dep_map;
| struct task_struct *owner;
| #endif
| } local_lock_t;
the struct is just empty.
Sebastian