linux-kernel - Re: [PATCH][trivial] crypto: tcrypt

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Date:	Wed, 25 Feb 2009 15:44:02 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Frank Seidel <fseidel@...e.de>
cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	linux kernel <linux-kernel@...r.kernel.org>,
	linux-crypto@...r.kernel.org, Frank Seidel <frank@...eidel.de>,
	akpm@...ux-foundation.org, "David S. Miller" <davem@...emloft.net>,
	nhorman@...driver.com, lho@...c.com, kaber@...sh.net,
	darrenrjenkins@...il.com, Greg KH <gregkh@...e.de>
Subject: Re: [PATCH][trivial] crypto: tcrypt - reduce stack size

On Wed, 25 Feb 2009, Frank Seidel wrote:
> Geert Uytterhoeven wrote:
> > Probably people should be reminded tcrypt can only be a module, not built-in,
> > so it won't waste precious unswappable kernel memory if it's static.
> 
> Thats right, but it also doesn't hurt to simply use kmalloc, does it? :-)

Wel...

Using kmalloc() increases code size, makes the code more complex, and increases
the risk of introducing a memory leak now or later.

> I just stumbled over tcrypt on the make checkstack output and as also
> the kerneljanitors todo advises to reduce this footprint where possible
> i just wanted to help out here.

Reducing stack usage is fine. However, for a loadable test module without
concurrency issues it's far easier to do that by just making the data static.

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone:    +32 (0)2 700 8453
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E-mail:   Geert.Uytterhoeven@...ycom.com
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