Start the arm64 pmap_pte at level 0
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Authored by andrew on Dec 20 2021, 10:10 AM.

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emaste

imp

Details

Reviewers

alc
kib
markj
manu

Group Reviewers

arm64

Summary

Return early when the level 0 page table is invalid. This will allows
us to skip over the entire memory range when walking the page tables.

Diff Detail

Repository

rS FreeBSD src repository - subversion

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Lint Passed

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No Test Coverage

Build Status

Buildable 43496
Build 40384: arc lint + arc unit

Event Timeline

andrew created this revision.Dec 20 2021, 10:10 AM

Herald added a reviewer: manu. · View Herald TranscriptDec 20 2021, 10:10 AM

Herald added subscribers: emaste, imp. · View Herald Transcript

Harbormaster completed remote builds in B43496: Diff 100335.Dec 20 2021, 10:10 AM

andrew requested review of this revision.Dec 20 2021, 10:10 AM

andrew mentioned this in D33459: Don't fail changing props for unmapped DMAP memory.

I'm confused. I don't see how this change makes any functional difference. The original code set *level == 0 and returned NULL when the L0 entry was not L0_TABLE, and only under those circumstances.

Revision Contents
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Path

Size

sys/

arm64/

pmap.c

9 lines

Diff 100335

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Start the arm64 pmap_pte at level 0Needs ReviewPublicActions