linux-kernel - Re: [Xen-devel] [PATCH v5 1/2] xenbus/backend: Add memory pressure handler callback

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Date:   Tue, 10 Dec 2019 11:21:49 +0100
From:   Roger Pau Monné <roger.pau@...rix.com>
To:     SeongJae Park <sj38.park@...il.com>
CC:     <axboe@...nel.dk>, <sjpark@...zon.com>, <konrad.wilk@...cle.com>,
        <pdurrant@...zon.com>, SeongJae Park <sjpark@...zon.de>,
        <linux-kernel@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <xen-devel@...ts.xenproject.org>
Subject: Re: [Xen-devel] [PATCH v5 1/2] xenbus/backend: Add memory pressure
 handler callback

On Tue, Dec 10, 2019 at 11:16:35AM +0100, Roger Pau Monné wrote:
> On Tue, Dec 10, 2019 at 08:06:27AM +0000, SeongJae Park wrote:
> > diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h
> > index 869c816d5f8c..cdb075e4182f 100644
> > --- a/include/xen/xenbus.h
> > +++ b/include/xen/xenbus.h
> > @@ -104,6 +104,7 @@ struct xenbus_driver {
> >  	struct device_driver driver;
> >  	int (*read_otherend_details)(struct xenbus_device *dev);
> >  	int (*is_ready)(struct xenbus_device *dev);
> > +	unsigned (*reclaim)(struct xenbus_device *dev);
> 
> ... hence I wonder why it's returning an unsigned when it's just
> ignored.
> 
> IMO it should return an int to signal errors, and the return should be
> ignored.

Meant to write 'shouldn't be ignored' sorry.

Roger.