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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Pavel Roskin <proski@gnu.org>
Cc: Johannes Berg <johannes@sipsolutions.net>, linux-sparse@vger.kernel.org
Subject: Re: sparse using insane amounts of memory
Date: Thu, 8 Mar 2007 09:43:23 -0800 (PST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0703080935120.10832@woody.linux-foundation.org> (raw)
In-Reply-To: <1173374010.15842.13.camel@dv>



On Thu, 8 Mar 2007, Pavel Roskin wrote:
> 
> Reducing the file may be tricky, since there is no definite way to say
> if the problem exists once the code becomes shorter.  But I'll try.

I would guess at

	static inline __attribute__((always_inline)) void device_rate_entry(..)

because while that function *looks* really simple ("Hey, it's just ten 
lines"), those lines expand to some nested compile-time constant macros 
from hell, and the end result is hundreds and hundreds of lines of really 
dense code because the macros are set up to be able to handle constant 
arguments asa constant.

That thing is a thing from hell.

			Linus

  parent reply	other threads:[~2007-03-08 17:43 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-08  2:02 sparse using insane amounts of memory Johannes Berg
     [not found] ` <1173319356.3546.54.camel-YfaajirXv214zXjbi5bjpg@public.gmane.org>
2007-03-08 16:33   ` Pavel Roskin
2007-03-08 16:45     ` Johannes Berg
2007-03-08 17:13       ` Pavel Roskin
2007-03-08 17:31         ` Chris Wedgwood
2007-03-08 17:43         ` Linus Torvalds [this message]
     [not found]       ` <1173372315.3248.19.camel-YfaajirXv214zXjbi5bjpg@public.gmane.org>
2007-03-08 17:34         ` Pavel Roskin
2007-03-08 17:42           ` Johannes Berg
2007-03-08 17:43           ` Johannes Berg
2007-03-08 18:08             ` Ivo van Doorn
2007-03-08 18:54               ` Linus Torvalds
     [not found]                 ` <Pine.LNX.4.64.0703081023490.10832-5CScLwifNT1QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>
2007-03-08 19:02                   ` Sam Ravnborg
2007-03-08 19:08                   ` Linus Torvalds
     [not found]                     ` <Pine.LNX.4.64.0703081104010.10832-5CScLwifNT1QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>
2007-03-10  5:05                       ` Darren Jenkins
2007-03-08 19:26                   ` Ivo van Doorn
2007-03-09  1:12                 ` OT [Re: sparse using insane amounts of memory] Tommy Thorn
2007-03-09  2:15                   ` OT David Miller

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