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

Sam Ravnborg
2006-04-16T14:04:50Z

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.

Sam