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LinuxKPI: Add write_seqcount_invalidate() and seqprop_sequence()

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functions to linux/seqlock.h

Sponsored by:	Serenity Cyber Security, LLC
Reviewed by:	manu
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D42810
This commit is contained in:
Vladimir Kondratyev 2023-12-24 11:19:59 +03:00
parent a39ed121ea
commit 64e30cba3f
1 changed files with 16 additions and 0 deletions
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16
sys/compat/linuxkpi/common/include/linux/seqlock.h
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@ -31,6 +31,7 @@
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cdefs.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/rwlock.h>
@ -84,9 +85,24 @@ seqcount_mutex_init(struct seqcount_mutex *seqcount, void *mutex __unused)
struct seqcount_mutex: seqc_write_end \
)(&(s)->seqc)
static inline void
lkpi_write_seqcount_invalidate(seqc_t *seqcp)
{
atomic_thread_fence_rel();
*seqcp += SEQC_MOD * 2;
}
#define write_seqcount_invalidate(s) lkpi_write_seqcount_invalidate(&(s)->seqc)
#define read_seqcount_begin(s) seqc_read(&(s)->seqc)
#define raw_read_seqcount(s) seqc_read_any(&(s)->seqc)
static inline seqc_t
lkpi_seqprop_sequence(const seqc_t *seqcp)
{
return (atomic_load_int(__DECONST(seqc_t *, seqcp)));
}
#define seqprop_sequence(s) lkpi_seqprop_sequence(&(s)->seqc)
/*
* XXX: Are predicts from inline functions still not honored by clang?
*/