Do not do torn writes to active LDTs.
ClosedPublic
Actions

Authored by kib on Sep 19 2017, 12:33 PM.

Tags

None

Referenced Files

	Unknown Object (File)
	Tue, Oct 14, 3:35 PM

	Unknown Object (File)
	Tue, Oct 14, 11:35 AM

	Unknown Object (File)
	Sat, Oct 11, 6:35 PM

	Unknown Object (File)
	Thu, Oct 9, 2:41 PM

	Unknown Object (File)
	Sep 14 2025, 1:57 PM

	Unknown Object (File)
	Sep 12 2025, 8:54 AM

	Unknown Object (File)
	Sep 2 2025, 11:35 AM

	Unknown Object (File)
	Aug 17 2025, 4:53 PM

View All 62 Files

Subscribers

imp

Details

Reviewers

jhb

Commits

rS323772: Do not do torn writes to active LDTs.

Summary

Care must be taken when updating the active LDT, since parallel threads might try to load a segment descriptor which is currently updated. Since the results are undefined, this cannot be ignored by claiming to be an application race.

Diff Detail

Repository

rS FreeBSD src repository - subversion

Lint

Lint Not Applicable

Unit

Tests Not Applicable

Event Timeline

kib created this revision.Sep 19 2017, 12:33 PM

Herald added a subscriber: imp. · View Herald TranscriptSep 19 2017, 12:33 PM

jhb accepted this revision.Sep 19 2017, 4:59 PM

This revision is now accepted and ready to land.Sep 19 2017, 4:59 PM

Closed by commit rS323772: Do not do torn writes to active LDTs. (authored by kib). · Explain WhySep 19 2017, 5:57 PM

This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

Path

Size

head/

sys/

amd64/

sys_machdep.c

35 lines

i386/

sys_machdep.c

34 lines

Diff 33227

View Options

head/sys/amd64/amd64/sys_machdep.c