parse the timer interrupt only once

[stlankes]

init() (boot core) and init_cpu() (application processors) both parsed the "arm,armv8-timer" node of the device tree to find the timer interrupt, and each picked its own triplet out of the four the node lists. The timer is a PPI, so every core enables it in its own redistributor — if the two parsers ever disagree about which interrupt the kernel uses, the application processors enable an interrupt that never fires and tasks sleeping on them are not woken up again.

Parse the node once in init(), cache the interrupt and its trigger mode, and let both callers enable it from there. No functional change: both sites selected the Non-secure Phys timer before.

[github-actions]

Benchmark Results

Details

Benchmark	Current: d7bafe7	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	82.09 s	80.34 s	1.02 ❗
startup_benchmark File Size	0.80 MB	0.80 MB	1.00 ❗
Startup Time - 1 core	0.74 s (±0.03 s)	0.75 s (±0.02 s)	1.00
Startup Time - 2 cores	0.75 s (±0.02 s)	0.74 s (±0.02 s)	1.01
Startup Time - 4 cores	0.76 s (±0.02 s)	0.74 s (±0.02 s)	1.03
multithreaded_benchmark Build Time	83.62 s	82.11 s	1.02 ❗
multithreaded_benchmark File Size	0.86 MB	0.86 MB	1.00 ❗
Multithreaded Pi Efficiency - 2 Threads	86.65 % (±7.73 %)	85.89 % (±6.61 %)	1.01
Multithreaded Pi Efficiency - 4 Threads	43.06 % (±2.87 %)	43.43 % (±2.56 %)	0.99
Multithreaded Pi Efficiency - 8 Threads	25.25 % (±1.80 %)	25.76 % (±1.53 %)	0.98
micro_benchmarks Build Time	81.67 s	80.40 s	1.02 ❗
micro_benchmarks File Size	0.86 MB	0.86 MB	1.00 ❗
Scheduling time - 1 thread	62.63 ticks (±3.13 ticks)	62.65 ticks (±4.06 ticks)	1.00
Scheduling time - 2 threads	35.09 ticks (±5.07 ticks)	34.08 ticks (±4.10 ticks)	1.03
Micro - Time for syscall (getpid)	3.32 ticks (±0.48 ticks)	3.45 ticks (±0.58 ticks)	0.96
Memcpy speed - (built_in) block size 4096	79678.63 MByte/s (±55361.21 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	0.97
Memcpy speed - (built_in) block size 1048576	30459.20 MByte/s (±24552.11 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	1.00
Memcpy speed - (built_in) block size 16777216	26391.51 MByte/s (±21772.32 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	1.00
Memset speed - (built_in) block size 4096	79817.52 MByte/s (±55466.35 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	0.97
Memset speed - (built_in) block size 1048576	31207.35 MByte/s (±24994.94 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	1.00
Memset speed - (built_in) block size 16777216	27145.54 MByte/s (±22248.56 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	1.00
Memcpy speed - (rust) block size 4096	74870.34 MByte/s (±51991.06 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	1.01
Memcpy speed - (rust) block size 1048576	30226.92 MByte/s (±24529.53 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	1.00
Memcpy speed - (rust) block size 16777216	26867.44 MByte/s (±22144.91 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	0.97
Memset speed - (rust) block size 4096	75304.73 MByte/s (±52305.27 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	1.01
Memset speed - (rust) block size 1048576	30960.17 MByte/s (±24946.64 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	1.00
Memset speed - (rust) block size 16777216	27635.09 MByte/s (±22624.95 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	0.97
alloc_benchmarks Build Time	75.96 s	74.76 s	1.02 ❗
alloc_benchmarks File Size	0.87 MB	0.87 MB	1.00 ❗
Allocations - Allocation success	91.31 %	91.31 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	61.44 %	61.44 %	1
Allocations - Average Allocation time	7897.94 Ticks (±132.95 Ticks)	5860.58 Ticks (±98.43 Ticks)	1.35 ❗
Allocations - Average Allocation time (no fail)	8430.56 Ticks (±126.56 Ticks)	6554.81 Ticks (±92.86 Ticks)	1.29 ❗
Allocations - Average Deallocation time	1496.32 Ticks (±367.78 Ticks)	1805.01 Ticks (±250.35 Ticks)	0.83
mutex_benchmark Build Time	75.83 s	79.82 s	0.95 ❗
mutex_benchmark File Size	0.86 MB	0.86 MB	1.00 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.04 ns (±0.34 ns)	12.10 ns (±0.41 ns)	1.00
Mutex Stress Test Average Time per Iteration - 2 Threads	41.84 ns (±2.38 ns)	40.26 ns (±1.68 ns)	1.04

This comment was automatically generated by workflow using github-action-benchmark.