Bug 197227 - [PATCH] Fix mutexes in databases/db5 on ARMv6 and later
Summary: [PATCH] Fix mutexes in databases/db5 on ARMv6 and later
Status: Closed FIXED
Alias: None
Product: Ports & Packages
Classification: Unclassified
Component: Individual Port(s) (show other bugs)
Version: Latest
Hardware: arm Any
: --- Affects Some People
Assignee: Andrew Turner
Depends on:
Reported: 2015-01-31 16:20 UTC by Andrew Turner
Modified: 2015-12-04 08:56 UTC (History)
2 users (show)

See Also:
mandree: maintainer-feedback+

Patch to fix mutexes on armv6 (458 bytes, patch)
2015-01-31 16:20 UTC, Andrew Turner
no flags Details | Diff

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Description Andrew Turner freebsd_committer 2015-01-31 16:20:01 UTC
Created attachment 152418 [details]
Patch to fix mutexes on armv6

The databases/db5 port uses it's own mutex implementation. Unfortunately on ARM it uses the deprecated swp instruction for these. On some hardware supported by the armv6 FreeBSD target architecture this instruction is unavailable so we disallow it here where possible.

The attached patch fixes this by using POSIX mutexes in this case.
Comment 1 Bugzilla Automation freebsd_committer 2015-01-31 16:20:01 UTC
Auto-assigned to maintainer mandree@FreeBSD.org
Comment 2 Matthias Andree freebsd_committer 2015-02-02 00:26:56 UTC
Hi Andrew,

I approve of the patch - be sure to commit a version you have tested though.

Do we need this on db48 and db6, too?
Comment 3 Sean Bruno freebsd_committer 2015-02-13 21:54:00 UTC
(In reply to Matthias Andree from comment #2)
unpatched armv6 builds running here:


db48, db5 and db6.
Comment 4 Sean Bruno freebsd_committer 2015-02-14 00:49:08 UTC
Hrm.  All three built with no error.  I assume that this is a runtime, not a compile issue then?
Comment 5 Andrew Turner freebsd_committer 2015-02-14 11:10:03 UTC
I have a local patch to llvm to not allow the bad instructions, unfortunately it's not able to be sent upstream as it breaks using them on earlier arm platforms where they are valid. I can test the other ports with these patches when I've cleared out my current patch queue.
Comment 6 Sean Bruno freebsd_committer 2015-05-07 17:06:21 UTC
(In reply to Andrew Turner from comment #5)

Should I commit this to the db ports?
Comment 7 Sean Bruno freebsd_committer 2015-05-07 17:08:59 UTC
Wait ... db48/db5/db6 all build for armv6 now.  This patch isn't needed anymore apparently.
Comment 8 Sean Bruno freebsd_committer 2015-05-07 17:21:22 UTC
(In reply to Sean Bruno from comment #7)
No, this is a runtime not a buildtime failure.  Still needed and should be committed.
Comment 9 commit-hook freebsd_committer 2015-05-07 17:36:33 UTC
A commit references this bug:

Author: sbruno
Date: Thu May  7 17:35:35 UTC 2015
New revision: 385644
URL: https://svnweb.freebsd.org/changeset/ports/385644

  enable posix-mutexes by default for armv6 targets as db will crash and burn
  when using the internal mutex implementation via unsupported instructions.

  PR:		197227
  Submitted by:	andrew@
  Approved by:	mandree@