linux-kernel - Re: [PATCH] linux/types.h: enable endian checks for all sparse builds

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Message-ID: <20161208075152-mutt-send-email-mst@kernel.org>
Date:   Thu, 8 Dec 2016 07:53:59 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Bart Van Assche <Bart.VanAssche@...disk.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Jason Wang <jasowang@...hat.com>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        Michal Marek <mmarek@...e.com>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Airlie <airlied@...ux.ie>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Cornelia Huck <cornelia.huck@...ibm.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "David S. Miller" <davem@...emloft.net>, Jens Axboe <axboe@...com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Asias He <asias@...hat.com>,
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        <v9fs-developer@...ts.sourceforge.net>
Subject: Re: [PATCH] linux/types.h: enable endian checks for all sparse builds

On Thu, Dec 08, 2016 at 05:21:47AM +0000, Bart Van Assche wrote:
> On 12/07/16 18:29, Michael S. Tsirkin wrote:
> > By now, linux is mostly endian-clean. Enabling endian-ness
> > checks for everyone produces about 200 new sparse warnings for me -
> > less than 10% over the 2000 sparse warnings already there.
> >
> > Not a big deal, OTOH enabling this helps people notice
> > they are introducing new bugs.
> >
> > So let's just drop __CHECK_ENDIAN__. Follow-up patches
> > can drop distinction between __bitwise and __bitwise__.
> 
> Hello Michael,
> 
> This patch makes a whole bunch of ccflags-y += -D__CHECK_ENDIAN__ 
> statements obsolete. Have you considered to remove these statements?

Absolutely. Just waiting for feedback on the idea.

> Additionally, there are notable exceptions to the rule that most drivers 
> are endian-clean, e.g. drivers/scsi/qla2xxx. I would appreciate it if it 
> would remain possible to check such drivers with sparse without enabling 
> endianness checks. Have you considered to change #ifdef __CHECK_ENDIAN__ 
> into e.g. #ifndef __DONT_CHECK_ENDIAN__?
> 
> Thanks,
> 
> Bart.

The right thing is probably just to fix these, isn't it?
Until then, why not just ignore the warnings?

-- 
MST