linux-kernel - Re: [PATCH v2 1/4] android: binder: Don't get mm from task

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Message-ID: <CAMP5Xgch6=OBGz2qgNeJaRO+CFW0cUz99HZeEpanozB57bE-tw@mail.gmail.com>
Date:   Mon, 23 Oct 2017 11:18:52 -0700
From:   Arve Hjønnevåg <arve@...roid.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Sherry Yang <sherryy@...roid.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        Riley Andrews <riandrews@...roid.com>,
        Martijn Coenen <maco@...gle.com>, Todd Kjos <tkjos@...gle.com>
Subject: Re: [PATCH v2 1/4] android: binder: Don't get mm from task

On Sat, Oct 21, 2017 at 1:15 AM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Fri, Oct 20, 2017 at 08:58:58PM -0400, Sherry Yang wrote:
>> Use binder_alloc struct's mm_struct rather than getting
>> a reference to the mm struct through get_task_mm to
>> avoid a potential deadlock between lru lock, task lock and
>> dentry lock, since a thread can be holding the task lock
>> and the dentry lock while trying to acquire the lru lock.
>>
>> Acked-by: Arve Hjønnevåg <arve@...roid.com>
>> Signed-off-by: Sherry Yang <sherryy@...roid.com>
>> ---
>>  drivers/android/binder_alloc.c | 22 +++++++++-------------
>>  drivers/android/binder_alloc.h |  1 -
>>  2 files changed, 9 insertions(+), 14 deletions(-)
>
> I've applied these first 2 patches, but patches 3 and 4 I have already
> applied to my char-misc-next tree, right?
>
> thanks,
>
> greg k-h

I would expect you got a merge conflict from one of those. Using patch
3 and 4 in from this patchset should avoid that conflict if your
eventual 4.15 branch is not based on your current char-misc-next
branch.

-- 
Arve Hjønnevåg