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

[Linus Walleij]

On Mon, Oct 23, 2017 at 11:31 AM, Pavel Machek <pavel@xxxxxx> wrote:

>> > 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?
>
> Here is the output:
> 0d:00.0 System peripheral [0880]: Ricoh Co Ltd PCIe SDXC/MMC Host Controller [1180:e823] (rev 07)
>         Subsystem: Lenovo Device [17aa:21da]
>         Kernel driver in use: sdhci-pci

So that is a Ricoh driver, one of the few that was supposed to benefit
from bounce buffers.

Except that if you actually turned it on:
> [10994.302196] kworker/2:1: page allocation failure: order:4,
so it doesn't have enough memory to use these bounce buffers
anyway.

I'm now feel it was the right thing to delete them.

I assume the problem doesn't appear in later -rc:s am I right?

Yours,
Linus Walleij