From: Andi Kleen <ak@suse.de>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: linux-kernel@vger.kernel.org,
Chuck Ebbert <76306.1226@compuserve.com>,
Zachary Amsden <zach@vmware.com>,
Jan Beulich <jbeulich@novell.com>, Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH RFC 6/6] Implement "current" with the PDA.
Date: Sun, 27 Aug 2006 18:01:16 +0200 [thread overview]
Message-ID: <200608271801.16406.ak@suse.de> (raw)
In-Reply-To: <20060827084453.452516832@goop.org>
On Sunday 27 August 2006 10:44, Jeremy Fitzhardinge wrote:
> Use the pcurrent field in the PDA to implement the "current" macro.
> This ends up compiling down to a single instruction to get the current
> task.
>
> The slightly tricky part about this patch is that cpu_init() uses
> current very early, before the PDA has been set up. In this instance,
> it uses current_thread_info()->task to get the current task.
>
> Also, the very early PDA set up for the boot cpu contains the initial
> task pointer so current works from a very early stage.
With that you could remove the code in do_IRQ now that setups up a fake thread_info
for interrupt stacks.
-Andi
next prev parent reply other threads:[~2006-08-27 16:02 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-27 8:44 [PATCH RFC 0/6] Implement per-processor data areas for i386 Jeremy Fitzhardinge
2006-08-27 8:44 ` [PATCH RFC 1/6] Basic definitions for i386-pda Jeremy Fitzhardinge
2006-08-27 8:44 ` [PATCH RFC 2/6] Initialize the per-CPU data area Jeremy Fitzhardinge
2006-08-27 8:44 ` [PATCH RFC 3/6] Use %gs as the PDA base-segment in the kernel Jeremy Fitzhardinge
2006-08-27 9:49 ` Keith Owens
2006-08-27 10:01 ` Jeremy Fitzhardinge
2006-08-27 15:57 ` Andi Kleen
2006-08-27 16:36 ` Jeremy Fitzhardinge
2006-08-27 17:20 ` Jeremy Fitzhardinge
2006-08-27 18:19 ` Andi Kleen
2006-08-27 20:03 ` Jan Engelhardt
2006-08-27 23:38 ` Jeremy Fitzhardinge
2006-08-28 9:51 ` Jan Beulich
2006-08-28 14:54 ` H. J. Lu
2006-08-28 17:24 ` H. Peter Anvin
2006-08-27 8:44 ` [PATCH RFC 4/6] Fix places where using %gs changes the usermode ABI Jeremy Fitzhardinge
2006-08-27 15:59 ` Andi Kleen
2006-08-27 16:37 ` Jeremy Fitzhardinge
2006-08-27 8:44 ` [PATCH RFC 5/6] Implement smp_processor_id() with the PDA Jeremy Fitzhardinge
2006-08-27 8:44 ` [PATCH RFC 6/6] Implement "current" " Jeremy Fitzhardinge
2006-08-27 16:01 ` Andi Kleen [this message]
2006-08-27 16:38 ` Jeremy Fitzhardinge
2006-08-27 9:47 ` [PATCH RFC 0/6] Implement per-processor data areas for i386 Arjan van de Ven
2006-08-27 16:46 ` Jeremy Fitzhardinge
2006-08-27 17:44 ` Arjan van de Ven
2006-08-27 18:07 ` Andi Kleen
2006-08-27 18:27 ` Jeremy Fitzhardinge
2006-08-27 16:01 ` Andi Kleen
2006-08-27 16:41 ` Jeremy Fitzhardinge
2006-08-27 17:21 ` Andreas Mohr
2006-08-27 17:34 ` Jeremy Fitzhardinge
2006-08-27 18:23 ` Andreas Mohr
2006-08-27 18:04 ` Andi Kleen
2006-08-27 18:27 ` Andreas Mohr
2006-08-27 18:35 ` Andi Kleen
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