CVS commit: src/sys/arch/sh3/sh3

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

Module Name:    src
Committed By:   rin
Date:           Thu Sep  2 07:55:56 UTC 2021

Modified Files:
        src/sys/arch/sh3/sh3: pmap.c

Log Message:
PR port-sh3/56381

pmap_enter() returns ENOMEM if __pmap_pte_alloc() fails and PMAP_CANFAIL
flag is specified. In this case, remove pv via __pmap_pv_remove() if it is
added to p-v map list via __pmap_pv_enter().

Otherwise, pmap becomes an inconsistent state, which results in an infinite
loop in pmap_page_protect(), as reported in the PR.

Also, KASSERT's are added for sure, in order to detect the infinite loops.

Great thanks to chs@ for finding out this bug!!


To generate a diff of this commit:
cvs rdiff -u -r1.85 -r1.86 src/sys/arch/sh3/sh3/pmap.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.