Author: kib Date: Sun Sep 5 14:47:46 2010 New Revision: 212233 URL: http://svn.freebsd.org/changeset/base/212233
Log: Document MAKEDEV_ETERNAL. MFC after: 3 days Modified: head/share/man/man9/make_dev.9 Modified: head/share/man/man9/make_dev.9 ============================================================================== --- head/share/man/man9/make_dev.9 Sun Sep 5 14:37:29 2010 (r212232) +++ head/share/man/man9/make_dev.9 Sun Sep 5 14:47:46 2010 (r212233) @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd May 6, 2010 +.Dd September 5, 2010 .Dt MAKE_DEV 9 .Os .Sh NAME @@ -135,6 +135,7 @@ The following values are currently accep MAKEDEV_REF reference the created device MAKEDEV_NOWAIT do not sleep, may return NULL MAKEDEV_WAITOK allow the function to sleep to satisfy malloc +MAKEDEV_ETERNAL created device will be never destroyed .Ed .Pp The @@ -154,6 +155,18 @@ the device created is destroyed immediat drops his reference to cdev. .Pp The +.Dv MAKEDEV_ETERNAL +flag allows the kernel to not acquire some locks when translating system +calls into the cdevsw methods calls. +It is responsibility of the driver author to make sure that +.Fn destroy_dev +is never called on the returned cdev. +For the convenience, use the +.Dv MAKEDEV_ETERNAL_KLD +flag for the code that can be compiled into kernel or loaded +(and unloaded) as loadable module. +.Pp +The .Fn make_dev_cred function is equivalent to the call .Bd -literal -offset indent _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"