PR/55366 CVS commit: src/sys/uvm

["Chuck Silvers" <chs%netbsd.org@localhost>]

The following reply was made to PR kern/55366; it has been noted by GNATS.

From: "Chuck Silvers" <chs%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/55366 CVS commit: src/sys/uvm
Date: Sun, 20 Sep 2020 23:03:01 +0000

 Module Name:	src
 Committed By:	chs
 Date:		Sun Sep 20 23:03:01 UTC 2020
 
 Modified Files:
 	src/sys/uvm: uvm_amap.c
 
 Log Message:
 Effectively disable the AMAP_REFALL flag because it is unsafe.
 This flag tells the amap code that it does not need to allocate ppref
 as part of adding or removing a reference, but that is only correct
 if the range of the reference being added or removed is the same
 as the range of all other references to the amap, and the point of
 this flag is exactly to try to optimize the case where the range is
 different and thus this flag would not be correct to use.
 Fixes PR 55366.
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.123 -r1.124 src/sys/uvm/uvm_amap.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.