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A couple of new macros to make implementing tunable values slightly easier.

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This commit is contained in:
Mike Smith 1999-07-05 08:45:14 +00:00
parent f667e26eed
commit 9f6f6f715c
1 changed files with 21 additions and 1 deletions
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22
sys/sys/kernel.h
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@ -39,7 +39,7 @@
* SUCH DAMAGE.
*
* @(#)kernel.h 8.3 (Berkeley) 1/21/94
* $Id: kernel.h,v 1.56 1999/07/01 13:21:43 peter Exp $
* $Id: kernel.h,v 1.57 1999/07/04 00:25:33 mckusick Exp $
*/
#ifndef _SYS_KERNEL_H_
@ -106,6 +106,7 @@ enum sysinit_sub_id {
SI_SUB_DONE = 0x0000001, /* processed*/
SI_SUB_CONSOLE = 0x0800000, /* console*/
SI_SUB_COPYRIGHT = 0x0800001, /* first use of console*/
SI_SUB_TUNABLES = 0x0700000, /* establish tunable values */
SI_SUB_VM = 0x1000000, /* virtual memory system init*/
SI_SUB_KMEM = 0x1800000, /* kernel memory*/
SI_SUB_CPU = 0x2000000, /* CPU resource(s)*/
@ -238,6 +239,25 @@ struct sysinit {
void sysinit_add __P((struct sysinit **set));
/*
* Infrastructure for tunable 'constants'. Value may be specified at compile
* time or kernel load time. Rules relating tunables together can be placed
* in a SYSINIT function at SI_SUB_TUNABLES with SI_ORDER_LAST.
*/
#define TUNABLE_INT_DECL(path, defval, var) \
static void __Tunable_ ## var (void *ignored) \
{ \
if (!getenv_int((path), &(var))) \
(var) = (defval); \
} \
SYSINIT(__Tunable_init_ ## var, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, __Tunable_ ## var , NULL);
#define TUNABLE_INT_FETCH(path, defval, var) \
if (!getenv_int((path), &(var))) \
(var) = (defval);
/*
* Compatibility. To be deprecated after LKM is removed.
*/