Make SMP timers standalone
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Cover letter [PATCH v2 00/15] Make SMP timers standalone
Quoted 9 lines · Marc Zyngier
On 22/12/11 19:32, Russell King - ARM Linux wrote:
Hi Russell,
Quoted 5 lines · Marc Zyngier
Quoted 3 lines
The proposal is to convert local timer drivers to be "standalone" (not relying on the local timer infrastructure) and to use a CPU notifier to have the timer brought up or down on non-boot CPUs.
Quoted 6 lines
Quoted 2 lines
You do realise that it's pointless having local timers on non-SMP hardware. On such hardware, you have a single timer instead.
I do. But on some non-SMP platforms, the local timer and the global timer can actually be the same (MSM is one example of this, and the UP version of the Cortex A15 is another).
On SMP MSM, we use the CPU0 local timer as the global timer. They are the same on non-SMP as well, I guess, but as Russell says, I'm not sure what the concept of a local timer would mean on non-SMP.
David
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