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SubjectRe: [PATCH v2 20/27] compat_ioctl: simplify the implementation
Test [PATCH] compat_ioctl: fix FIONREAD on devices, fixed my problem.

2020-02-08 1:06 GMT+08:00, Arnd Bergmann <>:
> On Fri, Feb 7, 2020 at 8:22 AM youling257 <> 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

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