mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-27 06:50:37 +00:00
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>
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_RCUWAIT_H_
|
|
#define _LINUX_RCUWAIT_H_
|
|
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/sched/signal.h>
|
|
#include <linux/types.h>
|
|
|
|
#define __RCUWAIT_INITIALIZER(name) \
|
|
{ .task = NULL, }
|
|
|
|
static inline void rcuwait_init(struct rcuwait *w)
|
|
{
|
|
w->task = NULL;
|
|
}
|
|
|
|
/*
|
|
* Note: this provides no serialization and, just as with waitqueues,
|
|
* requires care to estimate as to whether or not the wait is active.
|
|
*/
|
|
static inline int rcuwait_active(struct rcuwait *w)
|
|
{
|
|
return !!rcu_access_pointer(w->task);
|
|
}
|
|
|
|
extern int rcuwait_wake_up(struct rcuwait *w);
|
|
|
|
/*
|
|
* The caller is responsible for locking around rcuwait_wait_event(),
|
|
* and [prepare_to/finish]_rcuwait() such that writes to @task are
|
|
* properly serialized.
|
|
*/
|
|
|
|
static inline void prepare_to_rcuwait(struct rcuwait *w)
|
|
{
|
|
rcu_assign_pointer(w->task, current);
|
|
}
|
|
|
|
extern void finish_rcuwait(struct rcuwait *w);
|
|
|
|
#define ___rcuwait_wait_event(w, condition, state, ret, cmd) \
|
|
({ \
|
|
long __ret = ret; \
|
|
prepare_to_rcuwait(w); \
|
|
for (;;) { \
|
|
/* \
|
|
* Implicit barrier (A) pairs with (B) in \
|
|
* rcuwait_wake_up(). \
|
|
*/ \
|
|
set_current_state(state); \
|
|
if (condition) \
|
|
break; \
|
|
\
|
|
if (signal_pending_state(state, current)) { \
|
|
__ret = -EINTR; \
|
|
break; \
|
|
} \
|
|
\
|
|
cmd; \
|
|
} \
|
|
finish_rcuwait(w); \
|
|
__ret; \
|
|
})
|
|
|
|
#define rcuwait_wait_event(w, condition, state) \
|
|
___rcuwait_wait_event(w, condition, state, 0, schedule())
|
|
|
|
#define __rcuwait_wait_event_timeout(w, condition, state, timeout) \
|
|
___rcuwait_wait_event(w, ___wait_cond_timeout(condition), \
|
|
state, timeout, \
|
|
__ret = schedule_timeout(__ret))
|
|
|
|
#define rcuwait_wait_event_timeout(w, condition, state, timeout) \
|
|
({ \
|
|
long __ret = timeout; \
|
|
if (!___wait_cond_timeout(condition)) \
|
|
__ret = __rcuwait_wait_event_timeout(w, condition, \
|
|
state, timeout); \
|
|
__ret; \
|
|
})
|
|
|
|
#endif /* _LINUX_RCUWAIT_H_ */
|