On 05/18/2014 12:23 AM, Tom Lane wrote:
A larger issue is that we evidently have no buildfarm animals that are picky about alignment, or at least none that are running a modern-enough buildfarm script to be running the contrib/logical_decoding test. That seems like a significant gap. I don't want to volunteer to run a critter on my HPPA box: it's old enough, and eats enough electricity, that I no longer want to leave it on 24x7. Plus a lot of the time its response to a bus error is to lock up in a tight loop rather than report an error, so a failure wouldn't get reported usefully by the buildfarm anyway. Does anyone have an ARM or PPC box where they can configure the kernel not to mask misaligned fetches?
I did "echo 4 > /proc/cpu/alignment" on chipmunk - let's see what it crops up.
In quick testing with a little test program, it looks like an unaligned access to a 32-bit int still works without error. But an unaligned access to a 64-bit "long long" causes a SIGBUS now.
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