Re: [PATCH 1/3] jump label: add enabled/disabled state to jumplabel key entries

[Steven Rostedt]

On Wed, 2010-11-24 at 10:42 -0500, Jason Baron wrote:

> > And I think the only arch where you can do text pokes without cross-cpu
> > synchronization is one that doesn't have SMP support.
> > 
> > 
> 
> is this really true?
> 
> The powerpc implementation uses patch_instruction():
> 
> 
> arch/powerpc/lib/code-patching.c:
> 
> void patch_instruction(unsigned int *addr, unsigned int instr)
> {
>         *addr = instr;
>         asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r"
> (addr));
> }

Is this ever called outside of boot up? After SMP is enabled? (besides
for creating trampolines, before they are used).

-- Steve


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