linux-kernel - Re: [PATCH] staging: android: binder: move to the "real" part of the kernel

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Date:	Tue, 21 Oct 2014 22:05:22 +0200
From:	Pavel Machek <pavel@....cz>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	viro@...iv.linux.org.uk, John Stultz <john.stultz@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>, devel@...verdev.osuosl.org,
	Linux API <linux-api@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Anup Patel <anup.patel@...aro.org>
Subject: Re: [PATCH] staging: android: binder: move to the "real" part of the
 kernel

On Tue 2014-10-21 16:12:24, Arnd Bergmann wrote:
> On Tuesday 21 October 2014 12:36:22 Pavel Machek wrote:
> > On Fri 2014-10-17 01:12:21, Greg Kroah-Hartman wrote:
> > > On Thu, Oct 16, 2014 at 10:09:04AM -0700, John Stultz wrote:
> > > > On Thu, Oct 16, 2014 at 5:47 AM, Greg Kroah-Hartman
> > > > <gregkh@...uxfoundation.org> wrote:
> > > > > From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > 
> > > > Are the Android guys comfortable with the ABI stability rules they'll
> > > > now face?
> > > 
> > > Just because something is in staging, doesn't mean you don't have to
> > > follow the same ABI stability rules as the rest of the kernel.  If a
> > > change had happened to this code that broke userspace in the past, I
> > > would have reverted it.  So this should not be anything different from
> > > what has been happening inthe past.
> > 
> > Actually, there's big difference.
> > 
> > If Al Viro changes core filesystem in a way that breaks
> > staging/binder, binder is broken, and if it can't be fixed... well it
> > can't be fixed.
> > 
> > If Al Viro changes core filesystem in a way that breaks
> > drivers/binder, Al's change is going to be reverted.
> 
> One might have argued that we'd have to do that already, but the reasons
> for doing that with binder in the main kernel are certainly stronger.
> 
> > It is really hard to review without API documentation. Normally, API
> > documentation is required for stuff like this.
> > 
> > For example: does it add new files in /proc?
> > 
> > Given that it is stable, can we get rid of binder_debug() and
> > especially BINDER_DEBUG_ENTRY stuff?
> 
> Good point. We require documentation for every single sysfs attribute
> that gets added to a driver (some escape the review, but that doesn't
> change the rule), so we should not make an exception for a new procfs
> file here.

Actually, it looked like it is debugfs file. Code was messy enough
that I was not sure.

> > Could binder_transcation() be split to smaller functions according to
> > CodingStyle? 17 goto targets at the end of function are not exactly
> > easy to read.
> > 
> > ginder_thread_read/write also needs splitting.
> 
> Yes, in principle, but this is still a detail that would mainly serve
> to simplify review. The problem is more the lack of review and
> documentation of the API.

Yes, the problem is that code is impossible to review without API
documentation.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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