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From:   youling 257 <youling257@gmail.com>
Date:   Sat, 8 Feb 2020 04:02:19 +0800
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Subject: Re: [PATCH v2 20/27] compat_ioctl: simplify the implementation
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Jens Axboe <axboe@kernel.dk>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        linux-scsi <linux-scsi@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        linux-block <linux-block@vger.kernel.org>,
        Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>
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Test [PATCH] compat_ioctl: fix FIONREAD on devices, fixed my problem.

2020-02-08 1:06 GMT+08:00, Arnd Bergmann <arnd@arndb.de>:
> On Fri, Feb 7, 2020 at 8:22 AM youling257 <youling257@gmail.com> wrote:
>>
>> This patch cause a problem on 64bit kernel 32bit userspace.
>> My 32bit Androidx86 userspace run on 64bit mainline kernel, this patch
>> caused some app not detect root permission.
>
> Thanks for you work in bisecting the issue to my patch, sorry to have
> caused you trouble. After Christian Zigotzky
> also reported a problem in this file, I have been able to find a
> specific bug and just submitted a patch for it.
>
> Please have a look if that fix addresses your problem, as it's
> possible that there was more than one bug introduced
> by the original patch.
>
>        Arnd
>