linux-kernel - Re: Process to push changes to include/linux/types.h

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Date:	Thu, 14 Oct 2010 12:54:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Eric Paris <eparis@...hat.com>
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	agruen@...e.de, jengelh@...ozas.de, davem@...emloft.net,
	andi@...stfloor.org
Subject: Re: Process to push changes to include/linux/types.h

On Thu, 14 Oct 2010 15:34:52 -0400
Eric Paris <eparis@...hat.com> wrote:

> A patch was posted a bit ago by agruen which made a change to
> include/linux/types.h changing aligned_u64 to __aligned_u64 and exposing
> this new type to userspace.
> 
> http://marc.info/?l=linux-kernel&m=128316627912457&w=2
> 
> Everyone seemed to agree the patch was a good idea and was correct.  At
> the moment this change only really affects network code, but I would
> very much like to make use of this change in the notification tree.
> Dave Miller did not apply the patch because "Someone has to first add
> the types to linux/types.h, and that doesn't go through my tree."
> 
> http://marc.info/?l=linux-kernel&m=128634544524035&w=2
> 
> I'm a little stuck as to the right path forward.  I normally would have
> had no qualms about adding __aligned_u64 to types.h in the notification
> tree and pushing it to Linus next go-round and then the net tree could
> convert and potentially drop the old aligned_u64 type (but again that
> would be outside the net tree).  Since Dave isn't willing to add the
> type and I don't want to get called too many bad names, I figured I
> should try to find if there is some better way, maintainer, or tree who
> should be adding this new type.
> 
> Who needs to sign off on a new type in types.h?  Who should add it?
> Should I just ram it on in there myself, take any flames that come
> along, and then let net finish their cleanups after I've been charred?
> Any suggestions on the best course of action would be appreciated.
> 

The usual approach here is someone sends it to me and I send it to
Linus ;)

If the change is simple, obviously safe and is needed in two or more
subsystem trees then I'll usually sneak it into mainline late in -rc,
simply to make everyone's life easier.  Of course, you could both agree
to merge the same patch into local trees and I assume that git will
sort it all out.

For this particular patch I'd suggest it be split into two: one adds
the new __aligned_u64 and friends.  The second patch kills off
aligned_u64 and friends.  I'd say the first four-liner would then be
safe for immediate merge and the cleanup patch can go in any old time.

Regarding the patch itself: it uses open-coded
__attribute__((aligned(...))), however we have the __aligned(...)
helpers in compiler.h.

I'm always a bit ambivalent about those helpers (__packed, etc). 
They're not a very kernely thing to do, but the gcc __attribute__
syntax really is a mouthful.

And adding a compiler.h dependency to the shared-with-userspace types.h
may not be practical or safe, dunno.

So if this works, I'd suggest preparing the simple four-liner with the
intention of an immediate merge.

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