Parse cpu a76 core as a55 result in serious performance problem

Platform:android_arm64-android13
SOC: cortex A 4a55 and 4a76
Cpuinfo：core_siblings_list:0-7
HW:design 4a55 and 4a76 as a cluster on SOC and configure dtsi cpu 8core as a cluster.

Problem:Use benchmark tools test CPU performance,find cpuinfo parser cpu a76 core as a55 result in serious performance problem on Arm CPU

The cpuinfo call the main function as the following:
https://github.com/pytorch/cpuinfo/blob/76d5e8f5b563daa65340a60fce0e9aec73a936df/src/arm/linux/init.c#L34C37-L34C37

Use processors[0].package_leader_id update processors[sibling].package_leader_id(siblings value form 0 to 7).
Result in processors[i].package_leader_id value is 0.(i form 0 to 7)

//init.c:34
static bool cluster_siblings_parser(
	uint32_t processor, uint32_t siblings_start, uint32_t siblings_end,
	struct cpuinfo_arm_linux_processor* processors)
{
	for(int i = 0; i < 8; i++)
	   {cpuinfo_log_debug("init.c.39.processors[i].package_leader_id:%d, ",processors[i].package_leader_id);}
	processors[processor].flags |= CPUINFO_LINUX_FLAG_PACKAGE_CLUSTER;
	uint32_t package_leader_id = processors[processor].package_leader_id;
    cpuinfo_log_debug("File: %s, Function: %s, Line: %d, processor:%d, package_leader_id:%d,processors[processor].package_leader_id:%d,siblings_start:%d, siblings_end:%d\n", __FILE__, __func__, __LINE__,processor, package_leader_id,processors[processor].package_leader_id,siblings_start,siblings_end);

	for (uint32_t sibling = siblings_start; sibling < siblings_end; sibling++) {
		if (!bitmask_all(processors[sibling].flags, CPUINFO_LINUX_FLAG_VALID)) {
			cpuinfo_log_info("invalid processor %"PRIu32" reported as a sibling for processor %"PRIu32,
				sibling, processor);
			continue;
		}

		const uint32_t sibling_package_leader_id = processors[sibling].package_leader_id;
		if (sibling_package_leader_id < package_leader_id) {
			package_leader_id = sibling_package_leader_id;
		}
		// use processors[0].package_leader_id update processors[sibling].package_leader_id.
               //  processors[sibling].package_leader_id value is 0.
		processors[sibling].package_leader_id = package_leader_id;
		processors[sibling].flags |= CPUINFO_LINUX_FLAG_PACKAGE_CLUSTER;
		cpuinfo_log_debug("File: %s, Function: %s, Line: %d, sibling:%d, sibling_package_leader_id:%d, package_leader_id:%d\n", __FILE__, __func__, __LINE__,sibling,sibling_package_leader_id,package_leader_id);

	}

	processors[processor].package_leader_id = package_leader_id;

	return true;
}

Due to processors[processor].package_leader_id (processor from 0 to 7) is 0, cluster_leader value is 0 all the time.
https://github.com/pytorch/cpuinfo/blob/76d5e8f5b563daa65340a60fce0e9aec73a936df/src/arm/linux/init.c#L368

	/* Initialize core vendor, uarch, MIDR, and frequency for every logical processor */
	for (uint32_t i = 0; i < arm_linux_processors_count; i++) {
		if (bitmask_all(arm_linux_processors[i].flags, CPUINFO_LINUX_FLAG_VALID)) {
			const uint32_t cluster_leader = arm_linux_processors[i].package_leader_id;
			if (cluster_leader == i) {
				/* Cluster leader: decode core vendor and uarch */
				cpuinfo_arm_decode_vendor_uarch(
				arm_linux_processors[cluster_leader].midr,
#if CPUINFO_ARCH_ARM
				!!(arm_linux_processors[cluster_leader].features & CPUINFO_ARM_LINUX_FEATURE_VFPV4),
#endif
				&arm_linux_processors[cluster_leader].vendor,
				&arm_linux_processors[cluster_leader].uarch);
			} else {
				/* Cluster non-leader: copy vendor, uarch, MIDR, and frequency from cluster leader */
				arm_linux_processors[i].flags |= arm_linux_processors[cluster_leader].flags &
					(CPUINFO_ARM_LINUX_VALID_MIDR | CPUINFO_LINUX_FLAG_MAX_FREQUENCY);
				arm_linux_processors[i].midr = arm_linux_processors[cluster_leader].midr;
				arm_linux_processors[i].vendor = arm_linux_processors[cluster_leader].vendor;
				arm_linux_processors[i].uarch = arm_linux_processors[cluster_leader].uarch;
				arm_linux_processors[i].max_frequency = arm_linux_processors[cluster_leader].max_frequency;
			}
		}
	}

https://github.com/pytorch/cpuinfo/blob/76d5e8f5b563daa65340a60fce0e9aec73a936df/src/arm/linux/init.c#L383
arm_linux_processors[i].uarch = arm_linux_processors[cluster_leader].uarch;

Use arm_linux_processors[0].uarch update arm_linux_processors[i].uarch(i from o0 to 7),Reulst in

arm_linux_processors[i].uarch is the same as update arm_linux_processors[0].uarch which is a55(0x00300355 in the cpuinfo.h)

https://github.com/pytorch/cpuinfo/blob/76d5e8f5b563daa65340a60fce0e9aec73a936df/include/cpuinfo.h#L409

Please give me some advices.
BR.
Xiaotong

Start in src/arm/linux/init.c at cluster_siblings_parser and the processor initialization around lines 368-383, then review the uarch definitions in include/cpuinfo.h. Reproduce the parser behavior on the reported Android ARM64 A55/A76 system and verify whether mixed-cluster processors retain distinct uarch values. Done means A55 and A76 cores are reported correctly rather than all inheriting processor 0's result.