bit fields && data tearing

[Peter Hurley]

On 09/08/2014 03:17 PM, One Thousand Gnomes wrote:
>>> I think the whole "removing Alpha EV5" support is basically bonkers. Just
>>> use set_bit in the tty layer. Alpha will continue to work as well as it
>>> always has done and you won't design out support for any future processor
>>> that turns out not to do byte aligned stores.
>>>
>>> Alan
>>>
>>
>> Is *that* what we are talking about?  I was added to this conversation
>> in the middle where it had already generalized, so I had no idea.
>>
>> 	-hpa
> 
> Yes there are some flags in the tty layer that are vulnerable to this
> (although they've been vulnerable to it and missing a lock since last
> century with no known ill effects).

That observation cuts both ways; I'm willing to leave it vulnerable with
'no known ill effects' on the Alpha.