Re: [PATCH 0/3] jump label: updates for 2.6.37

["H. Peter Anvin" <hpa@zytor.com>]

On 11/23/2010 01:27 PM, Jason Baron wrote:
> Hi,
> 
> A few jump label patches that I want considered for 2.6.37. Patches are against
> the latest -tip tree.
> 
> The first one, which adds 'state' to the jump label mechanism is the most
> important. Essentially, it ensures that if jump labels are enabled/disabled in
> the core kernel but the actual call sites are in modules, we properly honor the
> state of the jump label. This also works for jump labels which may be defined in
> one module but made use of in another module.
> 
> There has been some discussion about using the 'key' variable to store the
> enabled/disabled state for each jump label. However, I think a better design
> will be to use the 'key' variable to store a pointer to the appropriate jump
> label tables. In this way, we can enable/disable jump labels, without the
> hashing that I'm currently doing. However, I didn't want to propose these more
> invasive changes until 2.6.38. 
> 

I would also like to see a change in the API, preferrably something
closer to the "SWITCH_POINT" interface I discussed with Stephen before
Kernel Summit.

	-hpa