.\" Copyright (c) 2021 The FreeBSD Foundation
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.\" This document was written by Ed Maste under sponsorhip from
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.Dd August 16, 2021
.Dt GONE_IN 9
.Os
.Sh NAME
.Nm gone_in ,
.Nm gone_in_dev
.Nd deprecation notice functions
.Sh SYNOPSIS
.In sys/systm.h
.Ft void
.Fn gone_in "int major" "const char *msg"
.Ft void
.Fn gone_in_dev "device_t dev" "int major" "const char *msg"
.Sh DESCRIPTION
The
.Fn gone_in
functions are used to provide a notice that the kernel is using a driver or
some other functionality that is deprecated, and will be removed in a future
.Fx
release.
The notice is sent to the kernel
.Xr dmesg 8
log and will appear on the console.
The
.Fa major
argument specifies the major version of the
.Fx
release that will remove the deprecated functionality.
.Pp
In releases before
.Fa major
the deprecation notice states
.Do
Deprecated code (to be removed in FreeBSD
.Fa major Ns ):
.Fa msg
.Dc .
In releases equal to and after
.Fa major
the notice states
.Do
Obsolete code will be removed soon:
.Fa msg
.Dc .
.Sh EXAMPLES
.Bd -literal -offset indent
void
sample_init(void)
{
	/* Initializaiton code omitted. */

	gone_in(14, "Giant-locked filesystem");
}

int
example_driver_attach(struct example_driver_softc *sc)
{
	/* Attach code omitted. */

        gone_in_dev(sc->dev, 14, "Giant-locked driver");
}
.Ed
.Sh HISTORY
The
.Nm
functions first appeared in
.Fx 11 .