Re: [PATCH 1/11] Add generic helpers for arch IPI function calls | KernelTrap

Re: [PATCH 1/11] Add generic helpers for arch IPI function calls

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From: James Bottomley <James.Bottomley@...>

To: David Howells <dhowells@...>

Cc: Andrew Morton <akpm@...>, Jens Axboe <jens.axboe@...>, <linux-arch@...>, <linux-kernel@...>, <npiggin@...>, <torvalds@...>, <peterz@...>, <sam@...>, Paul E. McKenney <paulmck@...>

Subject: Re: [PATCH 1/11] Add generic helpers for arch IPI function calls

Date: Monday, April 28, 2008 - 10:43 am

On Mon, 2008-04-28 at 15:25 +0100, David Howells wrote:
quoted text> We could use a GOT, but I believe that would add an extra memory
> access to any
> memory access or jump - which I'd prefer to avoid.

Not necessarily; this is how we work on PARISC with a GOT as the ELF
spec defines.  The point is that the GOT is linker constructed, so we
only lay down GOT entries when the linker sees that relative
displacements fail, so they don't consume memory (or even get brought
into existence) in the ordinary case.  The flip side of this is that we
do double jump (relative to jump through got) for the long displacements
we can't reach.

James

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Messages in current thread:

[PATCH 0/11] Generic smp_call_function() #2, Jens Axboe, (Tue Apr 22, 2:50 pm)

[PATCH 8/11] mips: convert to generic helpers for IPI functi..., Jens Axboe, (Tue Apr 22, 2:50 pm)

Re: [PATCH 8/11] mips: convert to generic helpers for IPI fu..., Ralf Baechle, (Tue Apr 22, 7:18 pm)

Re: [PATCH 8/11] mips: convert to generic helpers for IPI fu..., Jens Axboe, (Wed Apr 23, 3:18 am)

[PATCH 7/11] m32r: convert to generic helpers for IPI functi..., Jens Axboe, (Tue Apr 22, 2:50 pm)

[PATCH 6/11] arm: convert to generic helpers for IPI functio..., Jens Axboe, (Tue Apr 22, 2:50 pm)

[PATCH 5/11] alpha: convert to generic helpers for IPI funct..., Jens Axboe, (Tue Apr 22, 2:50 pm)

[PATCH 4/11] ia64: convert to generic helpers for IPI functi..., Jens Axboe, (Tue Apr 22, 2:50 pm)

[PATCH 3/11] powerpc: convert to generic helpers for IPI fun..., Jens Axboe, (Tue Apr 22, 2:50 pm)

[PATCH 2/11] x86: convert to generic helpers for IPI functio..., Jens Axboe, (Tue Apr 22, 2:50 pm)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Linus Torvalds, (Tue Apr 22, 3:03 pm)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Jens Axboe, (Wed Apr 23, 8:54 am)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Ingo Molnar, (Tue Apr 22, 3:12 pm)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Linus Torvalds, (Tue Apr 22, 3:22 pm)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Ingo Molnar, (Tue Apr 22, 3:26 pm)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Linus Torvalds, (Tue Apr 22, 3:50 pm)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Nick Piggin, (Tue Apr 22, 9:11 pm)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Linus Torvalds, (Tue Apr 22, 9:22 pm)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Nick Piggin, (Tue Apr 22, 9:36 pm)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Jens Axboe, (Wed Apr 23, 3:08 am)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Jeremy Fitzhardinge, (Sat Apr 26, 2:44 am)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Jens Axboe, (Sun Apr 27, 6:23 am)

Re: [PATCH 2/11] x86: convert to generic helpers for IPI fun..., Jeremy Fitzhardinge, (Sun Apr 27, 11:18 am)

[PATCH 1/11] Add generic helpers for arch IPI function calls, Jens Axboe, (Tue Apr 22, 2:50 pm)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Andrew Morton, (Sat Apr 26, 2:11 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Jens Axboe, (Sun Apr 27, 6:30 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Paul E. McKenney, (Sat Apr 26, 8:58 pm)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Jens Axboe, (Sun Apr 27, 6:36 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., James Bottomley, (Sat Apr 26, 10:13 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., David Howells, (Mon Apr 28, 10:25 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., James Bottomley, (Mon Apr 28, 10:43 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Russell King, (Thu Apr 24, 6:01 pm)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Jens Axboe, (Fri Apr 25, 3:18 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Jeremy Fitzhardinge, (Sat Apr 26, 2:28 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Jes Sorensen, (Mon Apr 28, 3:38 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Peter Zijlstra, (Tue Apr 22, 4:17 pm)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Jens Axboe, (Wed Apr 23, 2:07 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Peter Zijlstra, (Wed Apr 23, 2:32 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Jens Axboe, (Wed Apr 23, 3:49 am)

Re: [PATCH 1/11] Add generic helpers for arch IPI function c..., Peter Zijlstra, (Wed Apr 23, 3:50 am)

[PATCH 11/11] s390: convert to generic helpers for IPI funct..., Jens Axboe, (Tue Apr 22, 2:50 pm)

Re: [PATCH 11/11] s390: convert to generic helpers for IPI f..., Heiko Carstens, (Wed Apr 23, 3:58 am)

Re: [PATCH 11/11] s390: convert to generic helpers for IPI ..., Jens Axboe, (Wed Apr 23, 4:11 am)

Re: [PATCH 11/11] s390: convert to generic helpers for IPI ..., Jens Axboe, (Wed Apr 23, 7:21 am)

Re: [PATCH 11/11] s390: convert to generic helpers for IPI f..., Heiko Carstens, (Wed Apr 23, 7:47 am)

Re: [PATCH 11/11] s390: convert to generic helpers for IPI ..., Jens Axboe, (Wed Apr 23, 7:54 am)

Re: [PATCH 11/11] s390: convert to generic helpers for IPI f..., Martin Schwidefsky, (Wed Apr 23, 8:42 am)

Re: [PATCH 11/11] s390: convert to generic helpers for IPI f..., Rusty Russell, (Wed Apr 23, 11:56 am)

[PATCH 10/11] sh: convert to generic helpers for IPI functio..., Jens Axboe, (Tue Apr 22, 2:50 pm)

Re: [PATCH 10/11] sh: convert to generic helpers for IPI fun..., Paul Mundt, (Fri Apr 25, 4:56 am)

Re: [PATCH 10/11] sh: convert to generic helpers for IPI fun..., Jens Axboe, (Fri Apr 25, 5:16 am)

[PATCH 9/11] parisc: convert to generic helpers for IPI func..., Jens Axboe, (Tue Apr 22, 2:50 pm)

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