linux-kernel - Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is not enough ram for it

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Message-ID: <CAE9FiQVgMK=CK5BvfOkGF3Pp4kOqBEg2mxX2zDuhW8zZXSVXzg@mail.gmail.com>
Date:	Tue, 8 Jan 2013 17:07:14 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Shuah Khan <shuahkhan@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>, Jan Kiszka <jan.kiszka@....de>,
	Jason Wessel <jason.wessel@...driver.com>,
	linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is not
 enough ram for it

On Tue, Jan 8, 2013 at 4:58 PM, Eric W. Biederman <ebiederm@...ssion.com> wrote:

>
> So instead we need to say?
>
> +       if (no_iotlb_memory)
> +               panic("Cannot allocate SWIOTLB buffer");
> +
>
> Which is just making the panic a little later than it used to be and
> seems completely reasonable.

yes, looks some driver just use map_single without checking results.
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