Ubuntu
libatomic-ops package

needs porting for SMP support on armel

Bug #726844 reported by Steve Langasek
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
libatomic-ops (Ubuntu)
Fix Released
Undecided
Unassigned

Bug Description

According to https://wiki.ubuntu.com/ARM/Thumb2PackageReviewList, libatomic-ops needs porting to gcc atomics (which seems unlikely :) or to have explicit memory barriers added in order to be SMP-safe on v6 and v7 ARM systems, because as of version 1.2+cvs20080819-1, libatomic-ops uses both the ldrex and the swp instructions in ARM assembly. An explanation of these issues is available at <https://wiki.ubuntu.com/ARM/Thumb2PackageReviewList#ldrex> and <https://wiki.ubuntu.com/ARM/Thumb2PackageReviewList#swp>.

Steve Langasek (vorlon)
tags: added: arm-porting-queue
Revision history for this message
Ivan Maidanski (ivmai) wrote :

As of libatomic_ops v7.6.6, arm, aarch64, x86, x64 use gcc atomics by default.

Changed in libatomic-ops (Ubuntu):
status: New → Fix Released
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