Re: [PATCH] Make EWOULDBLOCK be equal to EAGAIN on parisc.

[Helge Deller <deller@gmx.de>]

On 01/17/2014 04:11 PM, Guy Martin wrote:
> On 2014-01-17 15:08, Carlos O'Donell wrote:
>> On Fri, Jan 17, 2014 at 9:01 AM, John David Anglin
>> <dave.anglin@bell.net> wrote:
>>> 
>>> On 17-Jan-14, at 3:55 AM, Guy Martin wrote:
>>> 
>>>> So despite the fact that this will break the ABI, the breakage
>>>> should be minimal if non existent while it will fix a lot of
>>>> hard to find and identify issues.
>>> 
>>> 
>>> Have you tested the change?
>> 
>> This is a good point.
>> 
>> If you can make this change and still boot your system with a
>> rebuilt kernel, then there is hope that your claims are true.
>> 
>> The basic argument would be: * Change kernel header to make
>> EWOULDBLOCK == AGAIN. * Rebuild kernel. * Boot system. * Verify
>> system is semifunctional, networking, IO, disk, XVnc, etc.
>> 
>> That would go a long way to showing that most of the system works.
>> 
>> Then if you emerge the world against those changed headers and it
>> goes well, then we might be talking about it being a low-impact
>> change.
>> 
> 
> I've rebuilt the kernel with the change and I can't see any impact. 
> NFS/SSH works fine and upgrading a few packages doesn't show any
> issue. I don't have X on that box.


Just a comment:
If we do an ABI break, we maybe should take other topics into account at the same time as well, e.g.
- increasing number of signals for systemd
- dropping some HP-UX signals
- maybe something needed to better support 64bit userspace ?
- ...

Helge