PR/38989 CVS commit: [netbsd-5] src/sys/uvm

[Soren Jacobsen <snj%netbsd.org@localhost>]

The following reply was made to PR port-i386/38989; it has been noted by GNATS.

From: Soren Jacobsen <snj%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/38989 CVS commit: [netbsd-5] src/sys/uvm
Date: Mon, 2 Mar 2009 20:50:26 +0000

 Module Name:   src
 Committed By:  snj
 Date:          Mon Mar  2 20:50:26 UTC 2009
 
 Modified Files:
        src/sys/uvm [netbsd-5]: uvm_page.c
 
 Log Message:
 Pull up following revision(s) (requested by drochner in ticket #541):
        sys/uvm/uvm_page.c: revision 1.143
 -fix two conditions where PQ_FREE was still/already set while the page
  was not anymore/yet on the freelist and uvm_fpageqlock was not held
 -clear PQ_FREE while the page is in the works of pageidlezero
 This avoids that the DMA memory allocator (pglistalloc) grabs a page
 which is not on the freelist, leading to a diagnostic panic (with DEBUG)
 or freelist corruption. (mostly on X server activation after a VT
 switch or suspend/resume because this can allocate megabytes of AGP
 memory)
 This might fix PR port-i386/38989 by Alan Barrett (in case this was
 a multiprocessor).
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.140.6.1 -r1.140.6.2 src/sys/uvm/uvm_page.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.