linux-kernel - Re: [lkp] [gpio] 3c702e9987: kmsg.user_verbs:couldn't_register_device

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Date:	Sun, 14 Feb 2016 18:48:37 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Michael Welling <mwelling@...e.org>
Cc:	kernel test robot <ying.huang@...ux.intel.com>, lkp@...org,
	LKML <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Markus Pargmann <mpa@...gutronix.de>,
	Johan Hovold <johan@...nel.org>
Subject: Re: [lkp] [gpio] 3c702e9987: kmsg.user_verbs:couldn't_register_device_number

On Sun, Feb 14, 2016 at 9:06 AM, Michael Welling <mwelling@...e.org> wrote:

> enum {
>         IB_UVERBS_MAJOR       = 231,
>         IB_UVERBS_BASE_MINOR  = 192,
>         IB_UVERBS_MAX_DEVICES = 32
> };
>
> #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
>
> Something tells me that a new GPIO chardev is taking this spot.

I don't think so, since gpio is reserving it as a core_initcall() it
gets a high chardev major. It's likely the device that used to
be device 232 stealing the fingerprint sensor slot that got
pushed down and is now stealing device 231 infiniband.

Maybe I should make a patch making fs/char_dev.c emit a warning
or fail when it goes below 234... it doesn't currently. It just steals
more numbers. It's a serious archtectural issue if it persists.

Yours,
Linus Walleij