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

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Date:   Mon, 23 Oct 2017 14:16:40 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        linux-mm@...ck.org
Subject: Re: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card

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