linux-kernel - Re: vmalloced stacks on x86

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Message-ID: <20141025091537.GA11433@gmail.com>
Date:	Sat, 25 Oct 2014 11:15:37 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: vmalloced stacks on x86_64?


* Andy Lutomirski <luto@...capital.net> wrote:

> Is there any good reason not to use vmalloc for x86_64 stacks?

In addition to what hpa mentioned, __pa()/__va() on-kstack DMA 
gets tricky, for legacy drivers. (Not sure how many of these are 
left though.)

Thanks,

	Ingo
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