diff options
| author | msmith <msmith@FreeBSD.org> | 1999-07-05 08:45:14 +0000 |
|---|---|---|
| committer | msmith <msmith@FreeBSD.org> | 1999-07-05 08:45:14 +0000 |
| commit | 9269cbe34a195665937c08188152618d66fcbe5c (patch) | |
| tree | 00e0eaea572c81ff62f4284c22098d82f4d3cd17 /sys | |
| parent | 66cc15851233a7645c2ad04a64f5a1cdbee1cd46 (diff) | |
| download | FreeBSD-src-9269cbe34a195665937c08188152618d66fcbe5c.zip FreeBSD-src-9269cbe34a195665937c08188152618d66fcbe5c.tar.gz | |
A couple of new macros to make implementing tunable values slightly easier.
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/sys/kernel.h | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/sys/sys/kernel.h b/sys/sys/kernel.h index 5d41ccf..5a2b617 100644 --- a/sys/sys/kernel.h +++ b/sys/sys/kernel.h @@ -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)*/ @@ -239,6 +240,25 @@ 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. */ #include <sys/module.h> |
