CVS commit: src/sys/arch/alpha/alpha

["Jason R Thorpe" <thorpej%netbsd.org@localhost>]

Module Name:    src
Committed By:   thorpej
Date:           Mon Jul  5 10:00:22 UTC 2021

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

Log Message:
Fix a bug introduced in pmap.c,v 1.287 where, when creating the PTE
in pmap_enter(), we would erroneously disregard MOD/REF attributes
already present on the page, thus causing FOW/FOR to be set incorrectly.
Normally this is not a big problem (an extra page fault will be taken
to resolve it), but if you access the mapping in interrupt context
(such as during IDE PIO, for example), a KASSERT can fire due to
acquiring an rwlock in interrupt context while servicing that fault.

Reported and bisected-to-commit by rin@.


To generate a diff of this commit:
cvs rdiff -u -r1.294 -r1.295 src/sys/arch/alpha/alpha/pmap.c

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