linux-kernel - Re: [PATCH] arm: get rid of hardcoded assumptions about kernel stack size

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Message-ID: <20140618143145.GH2186@arm.com>
Date:	Wed, 18 Jun 2014 15:31:45 +0100
From:	Will Deacon <will.deacon@....com>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Nicolas Pitre <nico@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm: get rid of hardcoded assumptions about kernel stack
 size

On Wed, Jun 18, 2014 at 02:50:22PM +0100, Andrey Ryabinin wrote:
> Changing kernel stack size on arm is not as simple as it should be:
> 1) THRED_SIZE macro doen't respect PAGE_SIZE and THREAD_SIZE_ORDER

THREAD_SIZE

> 2) stack size is hardcoded in get_thread_info macro
> 
> This patch fixes it by caculating THREAD_SIZE and thread_info address
> taking into account PAGE_SIZE and THREAD_SIZE_ORDER.
> 
> Now changing stack size becomes simply changing THREAD_SIZE_ORDER.

Curious: is this just a cleanup, or are you actually running out of kernel
stack on an ARM platform?

Will
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