Re: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card

From: Adrian Hunter
Date: Tue Oct 03 2017 - 02:34:21 EST

On 02/10/17 16:03, Pavel Machek wrote:
> On Mon 2017-10-02 14:06:03, Linus Walleij wrote:
>> On Mon, Oct 2, 2017 at 10:41 AM, Pavel Machek <pavel@xxxxxx> wrote:
>>>> Bounce buffers are being removed from v4.15
>> As Adrian states, this would make any last bugs go away. I would
>> even consider putting this patch this into fixes if it solves the problem.
>>> although you may experience
>>>> performance regression with that:
>>> Hmm. The performance of this is already pretty bad, I really hope it
>>> does not get any worse.
>> Did you use bounce buffers? Those were improving performance on
>> some laptops with TI or Ricoh host controllers and nothing else was
>> ever really using it (as can be seen from the commit).
> Thinkpad X220... how do I tell if I was using them? I believe so,
> because I uncovered bug in them before.

You are certainly using bounce buffers. What does lspci -knn show?