[Top] [All Lists]

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

To: Steven Rostedt <>
Subject: Re: [PATCH 00/05] robust per_cpu allocation for modules
From: Sam Ravnborg <>
Date: Sun, 16 Apr 2006 16:03:59 +0200
Cc: Paul Mackerras <>, Nick Piggin <>, LKML <>, Andrew Morton <>, Linus Torvalds <>, Ingo Molnar <>, Thomas Gleixner <>, Andi Kleen <>, Martin Mares <>,,,,, Chris Zankel <>, Marc Gauthier <>, Joe Taylor <>, David Mosberger-Tang <>,,,,,,,,,,,,,
In-reply-to: <1145194804.27407.103.camel@localhost.localdomain>
Original-recipient: rfc822;
References: <1145049535.1336.128.camel@localhost.localdomain> <> <> <> <> <> <1145194804.27407.103.camel@localhost.localdomain>
User-agent: Mutt/1.5.11
On Sun, Apr 16, 2006 at 09:40:04AM -0400, Steven Rostedt wrote:
> The per_cpu variables are defined with the macro 
>     DEFINE_PER_CPU(type, var)
> This macro just places the variable into the section .data.percpu and
> prepends the prefix "per_cpu__" to the variable.
> To use this variable in another .c file the declaration is used by the
> macro
>     DECLARE_PER_CPU(type, var)
> This macro is simply the extern declaration of the variable with the
> prefix added.
Suprisingly this macro shows up in ~19 .c files. Only valid usage is
forward declaration of a later static definition with DEFINE_PER_CPU.
arch/m32r/kernel/smp.c + arch/m32r/kernel/smpboot.c is jsut one example.

Just a random comment not related to Steven's patches.


<Prev in Thread] Current Thread [Next in Thread>