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

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Message-ID: <BLUPR02MB168304F8FBA50C916A6A4E6081840@BLUPR02MB1683.namprd02.prod.outlook.com>
Date:   Thu, 8 Dec 2016 06:38:11 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "Michael S. Tsirkin" <mst@...hat.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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        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
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        <virtualization@...ts.linux-foundation.org>,
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        <v9fs-developer@...ts.sourceforge.net>
Subject: Re: [PATCH] linux/types.h: enable endian checks for all sparse builds

On 12/07/16 21:54, Michael S. Tsirkin wrote:
> On Thu, Dec 08, 2016 at 05:21:47AM +0000, Bart Van Assche wrote:
>> 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__?
>
> The right thing is probably just to fix these, isn't it?
> Until then, why not just ignore the warnings?

Neither option is realistic. With endian-checking enabled the qla2xxx 
driver triggers so many warnings that it becomes a real challenge to 
filter the non-endian warnings out manually:

$ for f in "" CF=-D__CHECK_ENDIAN__; do make M=drivers/scsi/qla2xxx C=2\
     $f | &grep -c ': warning:'; done
4
752

If you think it would be easy to fix the endian warnings triggered by 
the qla2xxx driver, you are welcome to try to fix these.

Bart.