[fedora-arm] ARMv5 and atomic operations

Brendan Conoboy blc at redhat.com
Mon Apr 23 01:16:02 UTC 2012

As we get closer to having 100% package coverage in F17-ARM we're 
running into harder build failures due to the limitations of the chips 
we're building for.  The problem I've noticed on many of the recent 
failures is due to the lack of atomic operations (These didn't arrive 
until ARMv6).  How do we want to handle this?  I see a few options:

1. Abandon armv5 and move to armv6 where some of the operations we need 
are available.  This will still support the raspberry pi- what about 
kirkwood *plugs?

2. Excludearch armv5tel from the affected packages since they'll never 
work atomically.

3. Accept that these packages simply won't be available to 32 bit Fedora 
systems (this is the result of inaction).

4. Pretend operations are atomic when they are not.

5. Create magic patch that implements atomic operations through software.

Would appreciate feedback, especially if one of these options is a 
terrible idea that would impact you or the way you use Fedora adversely.

Brendan Conoboy / Red Hat, Inc. / blc at redhat.com

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