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Differential D19835

for a cache-only zone the destructor tries to destroy a non-existent keg
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Authored by tychon on Apr 5 2019, 11:55 PM.
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glebius
markj
jeff
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rS346150: for a cache-only zone the destructor tries to destroy a non-existent keg
Summary

Pure cache zones have no kegs. However since uz_keg and uz_lockptr are shared members of struct uma_zone a pointer to a lock may masquerade as a pointer to a keg. Therefore it’s insufficient to test uz_keg to determine if a zone has a keg.

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rS FreeBSD src repository - subversion
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Event Timeline

tychon created this revision.Apr 5 2019, 11:55 PM
tychon added a reviewer: glebius.
tychon added reviewers: markj, jeff.Apr 9 2019, 7:04 PM
markj added inline comments.Apr 11 2019, 8:08 AM
sys/vm/uma_core.c
1921 ↗(On Diff #55868)

I believe you can test (uz_flags & UMA_ZFLAG_CACHE) == 0 instead.

tychon mentioned this in D19845: to be compatible with an IOMMU LinuxKPI should use bus_dma(9).Apr 11 2019, 1:30 PM
tychon updated this revision to Diff 56091.Apr 11 2019, 1:43 PM
tychon edited the summary of this revision. (Show Details)

Use markj@'s suggestion for a more overt/intuitive fix.

tychon marked an inline comment as done.Apr 11 2019, 1:45 PM
markj accepted this revision.Apr 11 2019, 5:16 PM
markj added inline comments.
sys/vm/uma_core.c
1922 ↗(On Diff #56091)

These tests can be combined into one.

This revision is now accepted and ready to land.Apr 11 2019, 5:16 PM
tychon updated this revision to Diff 56130.Apr 12 2019, 11:01 AM

Might a well make this as good as can be. I combined the tests into one.

This revision now requires review to proceed.Apr 12 2019, 11:01 AM
markj accepted this revision.Apr 12 2019, 11:57 AM
This revision is now accepted and ready to land.Apr 12 2019, 11:57 AM
Closed by commit rS346150: for a cache-only zone the destructor tries to destroy a non-existent keg (authored by tychon). · Explain WhyApr 12 2019, 12:46 PM
This revision was automatically updated to reflect the committed changes.
Herald added a subscriber: imp. · View Herald TranscriptApr 12 2019, 12:46 PM

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Diff 56133

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head/sys/vm/uma_core.c

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