Re: [PATCH] bitops: simplify generic bit finding functions

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To: Linus Torvalds <torvalds@...>, Harvey Harrison <harvey.harrison@...>, David S. Miller <davem@...>
Cc: Ingo Molnar <mingo@...>, Andrew Morton <akpm@...>, LKML <linux-kernel@...>
Date: Monday, April 28, 2008 - 10:58 am

On Sun, 27 Apr 2008 13:26:34 -0700 (PDT), "Linus Torvalds"
<torvalds@linux-foundation.org> said:

Hello,

I think that's the wrong way to go about it. The problem that David
Miller pointed out was that the small-bitmap optimization caused an
inliningdisaster. Apparently, the generic version of __ffs is very
big on sparc64. In my opinion the implementation of __ffs should be
made out of line. If you move the wrapper of find_first_bit etc
out of line, all possibilities of optimization will be destroyed.
Better to remove them completely, then.

Greetings,
    Alexander

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  Alexander van Heukelum
  heukelum@fastmail.fm

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Messages in current thread:
[PATCH] bitops: simplify generic bit finding functions, Harvey Harrison, (Sun Apr 27, 4:19 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Alexander van Heukelum, (Mon Apr 28, 10:32 am)
Re: [PATCH] bitops: simplify generic bit finding functions, Linus Torvalds, (Sun Apr 27, 4:26 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Alexander van Heukelum, (Mon Apr 28, 10:58 am)
Re: [PATCH] bitops: simplify generic bit finding functions, Thomas Gleixner, (Mon Apr 28, 10:04 am)
Re: [PATCH] bitops: simplify generic bit finding functions, Linus Torvalds, (Mon Apr 28, 12:25 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Thomas Gleixner, (Mon Apr 28, 12:47 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Linus Torvalds, (Mon Apr 28, 12:54 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Thomas Gleixner, (Mon Apr 28, 3:26 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Linus Torvalds, (Mon Apr 28, 3:37 pm)
[PATCH] bitops: remove "optimizations", Thomas Gleixner, (Tue Apr 29, 6:01 am)
Re: [PATCH] bitops: remove "optimizations", David Miller, (Tue Apr 29, 6:03 am)
Re: [PATCH] bitops: remove "optimizations", David Miller, (Tue Apr 29, 8:34 am)
Re: [PATCH] bitops: remove "optimizations", Thomas Gleixner, (Tue Apr 29, 12:51 pm)
Re: [PATCH] bitops: remove "optimizations", David Miller, (Tue Apr 29, 6:58 pm)
Re: [PATCH] bitops: remove "optimizations", David Miller, (Tue Apr 29, 7:30 pm)
Re: [PATCH] bitops: remove "optimizations", Ingo Molnar, (Tue Apr 29, 10:20 am)
Re: [PATCH] bitops: remove "optimizations", David Miller, (Tue Apr 29, 6:31 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Alexander van Heukelum, (Mon Apr 28, 11:10 am)
Re: [PATCH] bitops: simplify generic bit finding functions, Thomas Gleixner, (Mon Apr 28, 11:58 am)
Re: [PATCH] bitops: simplify generic bit finding functions, Harvey Harrison, (Sun Apr 27, 4:29 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Linus Torvalds, (Sun Apr 27, 4:38 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Harvey Harrison, (Sun Apr 27, 4:38 pm)