PR/55467 CVS commit: src/sys/uvm

["Rin Okuyama" <rin%netbsd.org@localhost>]

The following reply was made to PR kern/55467; it has been noted by GNATS.

From: "Rin Okuyama" <rin%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/55467 CVS commit: src/sys/uvm
Date: Thu, 9 Jul 2020 09:24:33 +0000

 Module Name:	src
 Committed By:	rin
 Date:		Thu Jul  9 09:24:33 UTC 2020
 
 Modified Files:
 	src/sys/uvm: uvm_bio.c
 
 Log Message:
 PR kern/55467
 tmpfs calls pmap_kenter_pa(9) with virtual address with page offset
 
 Bisectioning revealed that the failure starts with this commit:
 
 sys/fs/tmpfs/tmpfs_vnops.c rev 1.142:
 http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/fs/tmpfs/tmpfs_vnops.c#rev1.142
 
 by which tmpfs became to use UBC_FAULTBUSY flag for ubc_uiomove(9).
 If this flag is specified, pmap_kenter_pa(9) is called with virtual
 address with page offset via ubc_alloc(9):
 
 https://nxr.netbsd.org/xref/src/sys/uvm/uvm_bio.c#616
 
 Most ports seem to neglect silently page offset of va argument for
 pmap_kenter_pa(9). However, it causes KASSERT failure correctly for
 powerpc/booke. So, truncate page offset there.
 
 Now, tmpfs works just fine on evbppc-booke, and I've confirmed that
 no new failures are detected by ATF.
 
 Discussed with chs@. Thanks!
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.120 -r1.121 src/sys/uvm/uvm_bio.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.