On 04/10/2013 04:59 PM, Rob Herring wrote:
On 04/10/2013 09:22 AM, Daniel Lezcano wrote:
The usual scheme to initialize a cpuidle driver on a SMP is:
cpuidle_register_driver(drv); for_each_possible_cpu(cpu) { device = &per_cpu(cpuidle_dev, cpu); cpuidle_register_device(device); }
This code is duplicated in each cpuidle driver.
On UP systems, it is done this way:
cpuidle_register_driver(drv); device = &per_cpu(cpuidle_dev, cpu); cpuidle_register_device(device);
On UP, the macro 'for_each_cpu' does one iteration:
#define for_each_cpu(cpu, mask) \ for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
Hence, the initialization loop is the same for UP than SMP.
Beside, we saw different bugs / mis-initialization / return code unchecked in the different drivers, the code is duplicated including bugs. After fixing all these ones, it appears the initialization pattern is the same for everyone.
Let's add a wrapper function doing this initialization with a cpumask parameter for the coupled idle states and use it for all the drivers.
That will save a lot of LOC, consolidate the code, and the modifications in the future could be done in a single place. Another benefit is the consolidation of the cpuidle_device variable which is now in the cpuidle framework and no longer spread accross the different arch specific drivers.
Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org
Perhaps my ack was too quick...
Hi Rob,
now that I have fixed the routine in V3, shall I consider the patch is acked ?
Thanks -- Daniel