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Create deprecation management functions.

Browse source 
gone_in(majar, msg);	If we're running in FreeBSD major, tell
			the user this code may be deleted soon.
			If we're running in FreeBSD major - 1,
			the the user is deprecated and will
			be gone in major.
			Otherwise say nothing.

gone_in_dev(dev, major, msg) Just like gone_in, except use device_printf.

New tunable / sysctl debug.oboslete_panic: 0 - don't panic,
	1 - panic in major or newer , 2 - panic in major - 1 or newer
	default: 0

if NO_OBSOLETE_CODE is defined, then both of these turn into compile
time errors when building for major. Add options NO_OBSOLETE_CODE to
kernel build system.

This lets us tag code that's going away so users know it will be gone,
as well as automatically manage things.

Differential Review: https://reviews.freebsd.org/D13818
This commit is contained in:
Warner Losh 2018-01-29 00:14:39 +00:00
parent 29077eb456
commit 7faed6e3e9
3 changed files with 67 additions and 0 deletions
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1
sys/conf/options
View file

@ -177,6 +177,7 @@ NO_ADAPTIVE_MUTEXES opt_adaptive_mutexes.h
NO_ADAPTIVE_RWLOCKS
NO_ADAPTIVE_SX
NO_EVENTTIMERS opt_timer.h
NO_OBSOLETE_CODE opt_global.h
NO_SYSCTL_DESCR opt_global.h
NSWBUF_MIN opt_swap.h
MBUF_PACKET_ZONE_DISABLE opt_global.h

50
sys/kern/subr_bus.c
View file

@ -5605,6 +5605,56 @@ devctl2_init(void)
UID_ROOT, GID_WHEEL, 0600, "devctl2");
}
/*
* APIs to manage deprecation and obsolescence.
*/
static int obsolete_panic = 0;
SYSCTL_INT(_debug, OID_AUTO, obsolete_panic, CTLFLAG_RWTUN, &obsolete_panic, 0,
"Bus debug level");
/* 0 - don't panic, 1 - panic if already obsolete, 2 - panic if deprecated */
static void
gone_panic(int major, int running, const char *msg)
{
switch (obsolete_panic)
{
case 0:
return;
case 1:
if (running < major)
return;
/* FALLTHROUGH */
default:
panic("%s", msg);
}
}
void
_gone_in(int major, const char *msg)
{
gone_panic(major, P_OSREL_MAJOR(__FreeBSD_version), msg);
if (P_OSREL_MAJOR(__FreeBSD_version) >= major)
printf("Obsolete code will removed soon: %s\n", msg);
else if (P_OSREL_MAJOR(__FreeBSD_version) + 1 == major)
printf("Deprecated code (to be removed in FreeBSD %d): %s\n",
major, msg);
}
void
_gone_in_dev(device_t dev, int major, const char *msg)
{
gone_panic(major, P_OSREL_MAJOR(__FreeBSD_version), msg);
if (P_OSREL_MAJOR(__FreeBSD_version) >= major)
device_printf(dev,
"Obsolete code will removed soon: %s\n", msg);
else if (P_OSREL_MAJOR(__FreeBSD_version) + 1 == major)
device_printf(dev,
"Deprecated code (to be removed in FreeBSD %d): %s\n",
major, msg);
}
#ifdef DDB
DB_SHOW_COMMAND(device, db_show_device)
{

16
sys/sys/systm.h
View file

@ -464,6 +464,22 @@ void intr_prof_stack_use(struct thread *td, struct trapframe *frame);
void counted_warning(unsigned *counter, const char *msg);
/*
* APIs to manage deprecation and obsolescence.
*/
struct device;
void _gone_in(int major, const char *msg);
void _gone_in_dev(struct device *dev, int major, const char *msg);
#ifdef NO_OBSOLETE_CODE
#define __gone_ok(m, msg) \
_Static_assert(m < P_OSREL_MAJOR(__FreeBSD_version)), \
"Obsolete code" msg);
#else
#define __gone_ok(m, msg)
#endif
#define gone_in(major, msg) __gone_ok(major, msg) _gone_in(major, msg)
#define gone_in_dev(dev, major, msg) __gone_ok(major, msg) _gone_in_dev(dev, major, msg)
__NULLABILITY_PRAGMA_POP
#endif /* !_SYS_SYSTM_H_ */