Re: [PATCH 00/05] robust per_cpu allocation for modules

• To: "Arnd Bergmann" <[email protected]>
• Subject: Re: [PATCH 00/05] robust per_cpu allocation for modules
• From: "Tony Luck" <[email protected]>
• Date: Sun, 16 Apr 2006 11:03:03 -0700
• Cc: "Steven Rostedt" <[email protected]>, "Paul Mackerras" <[email protected]>, "Nick Piggin" <[email protected]>, LKML <[email protected]>, "Andrew Morton" <[email protected]>, "Linus Torvalds" <[email protected]>, "Ingo Molnar" <[email protected]>, "Thomas Gleixner" <[email protected]>, "Andi Kleen" <[email protected]>, "Martin Mares" <[email protected]>, [email protected], [email protected], [email protected], [email protected], "Chris Zankel" <[email protected]>, "Marc Gauthier" <[email protected]>, "Joe Taylor" <[email protected]>, "David Mosberger-Tang" <[email protected]>, [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
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• In-reply-to: <[email protected]>
• References: <[email protected]> <[email protected]> <[email protected]> <[email protected]>
• Sender: [email protected]

On 4/16/06, Arnd Bergmann <[email protected]> wrote:
> #define PER_CPU_BASE 0xe000000000000000UL /* arch dependant */

On ia64 the percpu area is at 0xffffffffffff0000 so that it can be
addressed without tying up another register (all percpu addresses
are small negative offsets from "r0").  When David Mosberger
chose this address he said that gcc 4 would actually make
ue of this, but I haven't checked the generated code to see
whether it really is doing so.

-Tony
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---

• References:
  • [PATCH 00/05] robust per_cpu allocation for modules
    • From: Steven Rostedt <[email protected]>
  • Re: [PATCH 00/05] robust per_cpu allocation for modules
    • From: Paul Mackerras <[email protected]>
  • Re: [PATCH 00/05] robust per_cpu allocation for modules
    • From: Steven Rostedt <[email protected]>
  • Re: [PATCH 00/05] robust per_cpu allocation for modules
    • From: Arnd Bergmann <[email protected]>

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