[openeuler:OLK-6.6 2220/2220] arch/loongarch/kernel/paravirt.c:57:undefined reference to `__ashlti3'

12 May 2025

      tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   e1106320058bf1d983657f80490249b4f919ebad
commit: 462dd429f52a7659ea1c74f02f7134a43fccccc8 [2220/2220] LoongArch: Add pv ipi support on guest kernel side
config: loongarch-randconfig-001-20250512 (https://download.01.org/0day-ci/archive/20250512/202505122209.a4CThmkS-lkp@i...)
compiler: loongarch64-linux-gcc (GCC) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250512/202505122209.a4CThmkS-lkp@i...)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505122209.a4CThmkS-lkp@intel.com/

All errors (new ones prefixed by >>):

   loongarch64-linux-ld: arch/loongarch/kernel/paravirt.o: in function `pv_send_ipi_mask':
...
...
arch/loongarch/kernel/paravirt.c:57:(.text+0x1f4): undefined reference to `__ashlti3'
vim +57 arch/loongarch/kernel/paravirt.c

    33	
    34	#define KVM_IPI_CLUSTER_SIZE		(2 * BITS_PER_LONG)
    35	static void pv_send_ipi_mask(const struct cpumask *mask, unsigned int action)
    36	{
    37		unsigned int cpu, i, min = 0, max = 0, old;
    38		__uint128_t bitmap = 0;
    39		irq_cpustat_t *info;
    40	
    41		if (cpumask_empty(mask))
    42			return;
    43	
    44		action = BIT(action);
    45		for_each_cpu(i, mask) {
    46			info = &per_cpu(irq_stat, i);
    47			old = atomic_fetch_or(action, &info->message);
    48			if (old)
    49				continue;
    50	
    51			cpu = cpu_logical_map(i);
    52			if (!bitmap) {
    53				min = max = cpu;
    54			} else if (cpu > min && cpu < min + KVM_IPI_CLUSTER_SIZE) {
    55				max = cpu > max ? cpu : max;
    56			} else if (cpu < min && (max - cpu) < KVM_IPI_CLUSTER_SIZE) {
...
57				bitmap <<= min - cpu;
    58				min = cpu;
    59			} else {
    60				/*
    61				 * Physical cpuid is sorted in ascending order ascend
    62				 * for the next mask calculation, send IPI here
    63				 * directly and skip the remainding cpus
    64				 */
    65				kvm_hypercall3(KVM_HCALL_FUNC_PV_IPI,
    66					(unsigned long)bitmap,
    67					(unsigned long)(bitmap >> BITS_PER_LONG), min);
    68				min = max = cpu;
    69				bitmap = 0;
    70			}
    71			__set_bit(cpu - min, (unsigned long *)&bitmap);
    72		}
    73	
    74		if (bitmap)
    75			kvm_hypercall3(KVM_HCALL_FUNC_PV_IPI, (unsigned long)bitmap,
    76					(unsigned long)(bitmap >> BITS_PER_LONG), min);
    77	}
    78
-- 
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