Re: [PATCH] genirq: Add the entropy pool function to the PPI interrupt handler

["enlin.mu" <enlin.mu@linux.dev>]

Hi KH

hardware: raspberrypi 5

other patch(These two locations impact the entropy pool acceleration. 
comment them out temporarily):
acer@raspberrypi:linux $ git diff drivers/of/fdt.c 
drivers/char/hw_random/iproc-rng200.c
diff --git a/drivers/char/hw_random/iproc-rng200.c 
b/drivers/char/hw_random/iproc-rng200.c
index 33bc28f429f6..af105faa88c6 100644
--- a/drivers/char/hw_random/iproc-rng200.c
+++ b/drivers/char/hw_random/iproc-rng200.c
@@ -296,10 +296,10 @@ static const struct dev_pm_ops iproc_rng200_pm_ops = {
  };

  static const struct of_device_id iproc_rng200_of_match[] = {
-       { .compatible = "brcm,bcm2711-rng200", },
-       { .compatible = "brcm,bcm7211-rng200", },
-       { .compatible = "brcm,bcm7278-rng200", },
-       { .compatible = "brcm,iproc-rng200", },
+       { .compatible = "brcm,bcm2711-rng2000", },
+       { .compatible = "brcm,bcm7211-rng2000", },
+       { .compatible = "brcm,bcm7278-rng2000", },
+       { .compatible = "brcm,iproc-rng2000", },
         {},
  };
  MODULE_DEVICE_TABLE(of, iproc_rng200_of_match);
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 331646d667b9..13308d58785d 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1100,7 +1100,7 @@ int __init early_init_dt_scan_chosen(char *cmdline)

         rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l);
         if (rng_seed && l > 0) {
-               add_bootloader_randomness(rng_seed, l);
+               //add_bootloader_randomness(rng_seed, l);

                 /* try to clear seed so it won't be found. */
                 fdt_nop_property(initial_boot_params, node, "rng-seed");
acer@raspberrypi:linux $

Before testing:
acer@raspberrypi:linux $ dmesg | grep rng
[    3.360898] random: crng init done


After testing:
acer@raspberrypi:~ $ dmesg | grep rng
[    2.808880] random: crng init done




On 2026/6/16 13:59, Greg KH wrote:
> On Tue, Jun 16, 2026 at 01:50:42PM +0800, Enlin Mu wrote:
>> Accelerate the entropy pool initialization process
> 
> How?  Please explain.
> 
>> Signed-off-by: Enlin Mu <enlin.mu@linux.dev>
>> ---
>>   kernel/irq/chip.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
>> index de754db414d1..cbbd7e7d1156 100644
>> --- a/kernel/irq/chip.c
>> +++ b/kernel/irq/chip.c
>> @@ -926,6 +926,7 @@ void handle_percpu_devid_irq(struct irq_desc *desc)
>>   		trace_irq_handler_entry(irq, action);
>>   		res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
>>   		trace_irq_handler_exit(irq, action, res);
>> +		add_interrupt_randomness(irq);
> 
> Are you sure this does anything measurable?
> 
> thanks,
> 
> greg k-h