From bdab18633a302c82b5e5d5dbc4e38b0baf9c0837 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 20 Sep 2026 08:15:23 -0700 Subject: Merge tag 'locking-urgent-2026-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull futex fix from Ingo Molnar: - Also allocate a default private futex hash on vfork() as well, to avoid races with (private) futex waiters (Peter Zijlstra) * tag 'locking-urgent-2026-09-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: futex: Also allocate private hash on vfork() --- drivers/dibs/dibs_loopback.h | 57 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 drivers/dibs/dibs_loopback.h (limited to 'drivers/dibs/dibs_loopback.h') diff --git a/drivers/dibs/dibs_loopback.h b/drivers/dibs/dibs_loopback.h new file mode 100644 index 000000000..0664f6a8e --- /dev/null +++ b/drivers/dibs/dibs_loopback.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * dibs loopback (aka loopback-ism) device structure definitions. + * + * Copyright (c) 2024, Alibaba Inc. + * + * Author: Wen Gu + * Tony Lu + * + */ + +#ifndef _DIBS_LOOPBACK_H +#define _DIBS_LOOPBACK_H + +#include +#include +#include +#include +#include + +#if IS_ENABLED(CONFIG_DIBS_LO) +#define DIBS_LO_DMBS_HASH_BITS 12 +#define DIBS_LO_MAX_DMBS 5000 + +struct dibs_lo_dmb_node { + struct hlist_node list; + u64 token; + u32 len; + u32 sba_idx; + void *cpu_addr; + dma_addr_t dma_addr; + refcount_t refcnt; +}; + +struct dibs_lo_dev { + struct dibs_dev *dibs; + atomic_t dmb_cnt; + rwlock_t dmb_ht_lock; + DECLARE_BITMAP(sba_idx_mask, DIBS_LO_MAX_DMBS); + DECLARE_HASHTABLE(dmb_ht, DIBS_LO_DMBS_HASH_BITS); + wait_queue_head_t ldev_release; +}; + +int dibs_loopback_init(void); +void dibs_loopback_exit(void); +#else +static inline int dibs_loopback_init(void) +{ + return 0; +} + +static inline void dibs_loopback_exit(void) +{ +} +#endif + +#endif /* _DIBS_LOOPBACK_H */ -- cgit v1.3.1