[fedora-arm] Fedora 20 for Raspberry Pi????
steveu at coppice.org
Fri Dec 27 03:22:17 UTC 2013
On 12/27/2013 03:49 AM, Gordan Bobic wrote:
> On 12/26/2013 02:20 PM, Derek Atkins wrote:
>> Gordan Bobic <gordan at bobich.net> writes:
>>> (e.g. (but not limited to) a large number of packages make little or
>>> no effort to ensure memory accesses are aligned - including the likes
>>> of e2fsprogs, and transparent alignment fixup in hardware is only
>>> available on armv7 and later).
>> I'm surprised that Ted isn't willing to fix issues in e2fsprogs.
>> If you can point me to the upstream bug reports I can ping him to see
>> what's up?
> Take a look here:
> As has been mentioned before, there is a whole shedload of packages
> that have similar issues - I have seen literally thousands of
> alignment faults get reported (I have the alignment set to fix+warn on
> my armv5tel builders) in various packages during build and test
> stages. Once upon a time I planned to collate the data and get the
> issue reported to all upstream maintainers, but that is a mammoth task
> just to report, let alone fix, and I have very little faith there is
> enough will among the developers to fix all the affected packages and
> ensure they write code that isn't affected by this problem going forward.
This is hardly surprising, as you can't really fix what you can't test.
15 years ago my Linux/Unix code was always clear of alignment issues, as
I developed on a mix of Alpha and x86 machines, and the Alphas didn't
like misalignment. I think enough people developed on a mixture of
machines to flush out most of the alignment issues back then.
We entered a period of such x86 dominance that few people saw alignment
issues any more, and I suspect the number of issues grew rapidly. Now,
non-x86 work is growing again, but its mostly on ARMv7 devices, so I
think its unlikely the frequency of alignment issues will ever go down
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