Date: Sun, 30 Aug 1998 08:34:37 -0700 (PDT) From: kkennawa@physics.adelaide.edu.au To: freebsd-gnats-submit@FreeBSD.ORG Subject: kern/7782: Kernel rebuild not correctly responding to change in NSWAPDEV Message-ID: <199808301534.IAA00883@hub.freebsd.org>
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>Number: 7782 >Category: kern >Synopsis: Kernel rebuild not correctly responding to change in NSWAPDEV >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Aug 30 08:40:01 PDT 1998 >Last-Modified: >Originator: Kris Kennaway >Organization: >Release: 3.0-CURRENT >Environment: FreeBSD morden.rebel.net.au 3.0-CURRENT FreeBSD 3.0-CURRENT #50: Sun Aug 30 22:28:42 CST 1998 kkenn@morden.rebel.net.au:/usr2/src/sys/compile/MORDEN i386 >Description: When changing the value of NSWAPDEV in the kernel config and rebuilding the kernel (cd /usr/src/sys/compile/MORDEN;make depend;make all), it doesnt seem to correctly rebuild all necessary parts of the source. After rebooting with the new kernel, I was unable to add new swap devices until I did a 'make clean' and rebuilt the kernel from scratch. >How-To-Repeat: Following the instructions in the FAQ, I tried to add an extra swap partition using /dev/vn0b My kernel config has the necessary pseudo-device vn 1 #Vnode driver (turns a file into a device) and I changed NSWAPDEV from 2 to 3 options NSWAPDEV=3 Upon doing a `config MORDEN`, re-making and re-installing the kernel, and rebooting, or thereafter trying the vnconfig command manually: vnconfig -ce /dev/vn0c /usr/swap0 swap I got the error from swapon: swapon: /dev/vn0c: Invalid argument as though the NSWAPDEV parameter had not been updated. http://www.freebsd.org/cgi/getmsg.cgi?fetch=136472+138452+ /usr/local/www/db/text/1997/freebsd-current/19971019.freebsd-current (URL is one line) gives another documented case of this problem. Following that advice, I did a `make clean` of my kernel and rebuilt it; upon rebooting again the swap device appeared. It is as if there's some missing dependencies in the kernel config for this parameter. >Fix: Re-making a kernel from scratch fixes this problem, but the fact that under most circumstances we can just make depend;make all and only recompile the changed bits of the kernel is misleading. >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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