linux-kernel - Re: [PATCH v2] kthread: Export kthread functions

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Date:	Fri, 31 Jul 2015 16:14:14 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	yalin wang <yalin.wang2010@...il.com>
cc:	Neil Horman <nhorman@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Kershner <david.kershner@...sys.com>, tj@...nel.org,
	laijs@...fujitsu.com, nacc@...ux.vnet.ibm.com, mingo@...hat.com,
	open list <linux-kernel@...r.kernel.org>,
	jes.sorensen@...hat.com, sparmaintainer@...sys.com
Subject: Re: [PATCH v2] kthread: Export kthread functions


On Fri, 31 Jul 2015, Thomas Gleixner wrote:

> On Fri, 31 Jul 2015, yalin wang wrote:
> > it is optimised to 2 instructions ,
> > 
> > this is my patch, hope can be merged :
> 
> We are not exposing the internals of kthread management. Period.

And your 'optimization' is completely bogus:

Before your modification:

size kernel/built-in.o

   text	   data	    bss	    dec	    hex	filename
1091514	 141498  341928 1574940  18081c	../build/kernel/built-in.o

After:

   text	   data	    bss	    dec	    hex	filename
1091664  141498  341928 1575090  1808b2	../build/kernel/built-in.o

That's an increase of text size by 150 byte. Interesting optimization.

Thanks,

	tglx


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