mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-28 21:02:43 +01:00
Suren Baghdasaryan
2c2bd11cab
Move rcuwait struct definition into types.h so that rcuwait can be used without including rcuwait.h which includes other headers. Without this change mm_types.h can't use rcuwait due to a the following circular dependency: mm_types.h -> rcuwait.h -> signal.h -> mm_types.h Link: https://lkml.kernel.org/r/[email protected] Suggested-by: Matthew Wilcox <[email protected]> Signed-off-by: Suren Baghdasaryan <[email protected]> Acked-by: Davidlohr Bueso <[email protected]> Acked-by: Liam R. Howlett <[email protected]> Acked-by: Lorenzo Stoakes <[email protected]> Tested-by: Shivank Garg <[email protected]> Link: https://lkml.kernel.org/r/[email protected] Cc: Christian Brauner <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: David Howells <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Jann Horn <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: Klara Modin <[email protected]> Cc: Lokesh Gidra <[email protected]> Cc: Mateusz Guzik <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Minchan Kim <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Pasha Tatashin <[email protected]> Cc: "Paul E . McKenney" <[email protected]> Cc: Peter Xu <[email protected]> Cc: Peter Zijlstra (Intel) <[email protected]> Cc: Shakeel Butt <[email protected]> Cc: Sourav Panda <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Wei Yang <[email protected]> Cc: Will Deacon <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Stephen Rothwell <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_RCUWAIT_H_
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#define _LINUX_RCUWAIT_H_
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#include <linux/rcupdate.h>
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#include <linux/sched/signal.h>
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#include <linux/types.h>
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#define __RCUWAIT_INITIALIZER(name) \
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{ .task = NULL, }
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static inline void rcuwait_init(struct rcuwait *w)
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{
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w->task = NULL;
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}
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/*
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* Note: this provides no serialization and, just as with waitqueues,
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* requires care to estimate as to whether or not the wait is active.
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*/
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static inline int rcuwait_active(struct rcuwait *w)
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{
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return !!rcu_access_pointer(w->task);
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}
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extern int rcuwait_wake_up(struct rcuwait *w);
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/*
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* The caller is responsible for locking around rcuwait_wait_event(),
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* and [prepare_to/finish]_rcuwait() such that writes to @task are
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* properly serialized.
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*/
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static inline void prepare_to_rcuwait(struct rcuwait *w)
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{
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rcu_assign_pointer(w->task, current);
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}
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extern void finish_rcuwait(struct rcuwait *w);
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#define ___rcuwait_wait_event(w, condition, state, ret, cmd) \
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({ \
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long __ret = ret; \
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prepare_to_rcuwait(w); \
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for (;;) { \
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/* \
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* Implicit barrier (A) pairs with (B) in \
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* rcuwait_wake_up(). \
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*/ \
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set_current_state(state); \
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if (condition) \
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break; \
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\
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if (signal_pending_state(state, current)) { \
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__ret = -EINTR; \
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break; \
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} \
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\
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cmd; \
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} \
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finish_rcuwait(w); \
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__ret; \
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})
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#define rcuwait_wait_event(w, condition, state) \
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___rcuwait_wait_event(w, condition, state, 0, schedule())
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#define __rcuwait_wait_event_timeout(w, condition, state, timeout) \
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___rcuwait_wait_event(w, ___wait_cond_timeout(condition), \
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state, timeout, \
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__ret = schedule_timeout(__ret))
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#define rcuwait_wait_event_timeout(w, condition, state, timeout) \
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({ \
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long __ret = timeout; \
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if (!___wait_cond_timeout(condition)) \
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__ret = __rcuwait_wait_event_timeout(w, condition, \
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state, timeout); \
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__ret; \
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})
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#endif /* _LINUX_RCUWAIT_H_ */
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