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

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

Module Name:    src
Committed By:   thorpej
Date:           Thu Jun 24 16:41:16 UTC 2021

Modified Files:
        src/sys/arch/alpha/common: sgmap_typedep.c

Log Message:
Deal with a scenario where:
- DMA map has a boundary constraint.
- Caller asks us to map a buffer that's exactly the same size as the
  boundary constraint, but is not page-aligned.

This results in the size being larger than the boundary constraint after
page-rounding, and and vmem_xalloc() fires a KASSERT for it.  This is
easy to trigger by running fsck.

We handle this by detecting the condition and creating an extra DMA
segment for it the spill-over.


To generate a diff of this commit:
cvs rdiff -u -r1.41 -r1.42 src/sys/arch/alpha/common/sgmap_typedep.c

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