Messages in this thread | | | Date | Wed, 20 May 2015 09:21:16 +0200 | Subject | Re: [PATCH] gpiolib: debugfs: display gpios requested as irq only | From | Linus Walleij <> |
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On Tue, May 19, 2015 at 5:39 PM, Johan Hovold <johan@kernel.org> wrote: > On Tue, May 19, 2015 at 04:12:35PM +0200, Linus Walleij wrote:
>> What? If I wanted a stable interface I would use sysfs and document >> the ABI in Documentation/ABI/*. >> >> debugfs is not ABI. > > As I mentioned in my response to Grygorii, not everyone -- and most > notably apparently not even Linus Torvalds -- agrees on this:
Yeah I was sloppy I guess.
What I mean, precisely is that sysfs is ABI, whether documented or not.
Even debugfs is actually blurry, as per Documentation/filesystems/debugfs.txt:
"The debugfs filesystem is also intended to not serve as a stable ABI to user space; in theory, there are no stability constraints placed on files exported there. The real world is not always so simple, though [1]; even debugfs interfaces are best designed with the idea that they will need to be maintained forever."
But I haven't been bitten by it yet so that's why I allow some poetic license.
Yours, Linus Walleij
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