forked from mirrors/linux
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/20250213224655.1680278-7-surenb@google.com Suggested-by: Matthew Wilcox <willy@infradead.org> Signed-off-by: Suren Baghdasaryan <surenb@google.com> Acked-by: Davidlohr Bueso <dave@stgolabs.net> Acked-by: Liam R. Howlett <Liam.Howlett@Oracle.com> Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Tested-by: Shivank Garg <shivankg@amd.com> Link: https://lkml.kernel.org/r/5e19ec93-8307-47c2-bb13-3ddf7150624e@amd.com Cc: Christian Brauner <brauner@kernel.org> Cc: David Hildenbrand <david@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jann Horn <jannh@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Klara Modin <klarasmodin@gmail.com> Cc: Lokesh Gidra <lokeshgidra@google.com> Cc: Mateusz Guzik <mjguzik@gmail.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@suse.com> Cc: Minchan Kim <minchan@google.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Pasha Tatashin <pasha.tatashin@soleen.com> Cc: "Paul E . McKenney" <paulmck@kernel.org> Cc: Peter Xu <peterx@redhat.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Shakeel Butt <shakeel.butt@linux.dev> Cc: Sourav Panda <souravpanda@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Wei Yang <richard.weiyang@gmail.com> Cc: Will Deacon <will@kernel.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
82 lines
2 KiB
C
82 lines
2 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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