mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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74d46d6b2d
percpu code has been assuming num_possible_cpus() == nr_cpu_ids which is incorrect if cpu_possible_map contains holes. This causes percpu code to access beyond allocated memories and vmalloc areas. On a sparc64 machine with cpus 0 and 2 (u60), this triggers the following warning or fails boot. WARNING: at /devel/tj/os/work/mm/vmalloc.c:106 vmap_page_range_noflush+0x1f0/0x240() Modules linked in: Call Trace: [00000000004b17d0] vmap_page_range_noflush+0x1f0/0x240 [00000000004b1840] map_vm_area+0x20/0x60 [00000000004b1950] __vmalloc_area_node+0xd0/0x160 [0000000000593434] deflate_init+0x14/0xe0 [0000000000583b94] __crypto_alloc_tfm+0xd4/0x1e0 [00000000005844f0] crypto_alloc_base+0x50/0xa0 [000000000058b898] alg_test_comp+0x18/0x80 [000000000058dad4] alg_test+0x54/0x180 [000000000058af00] cryptomgr_test+0x40/0x60 [0000000000473098] kthread+0x58/0x80 [000000000042b590] kernel_thread+0x30/0x60 [0000000000472fd0] kthreadd+0xf0/0x160 ---[ end trace 429b268a213317ba ]--- This patch fixes generic percpu functions and sparc64 setup_per_cpu_areas() so that they handle sparse cpu_possible_map properly. Please note that on x86, cpu_possible_map() doesn't contain holes and thus num_possible_cpus() == nr_cpu_ids and this patch doesn't cause any behavior difference. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: David S. Miller <davem@davemloft.net> Cc: Ingo Molnar <mingo@elte.hu> |
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| .. | ||
| .gitignore | ||
| apc.c | ||
| asm-offsets.c | ||
| audit.c | ||
| auxio_32.c | ||
| auxio_64.c | ||
| central.c | ||
| cherrs.S | ||
| chmc.c | ||
| compat_audit.c | ||
| cpu.c | ||
| cpumap.c | ||
| cpumap.h | ||
| devices.c | ||
| dma.c | ||
| dma.h | ||
| ds.c | ||
| dtlb_miss.S | ||
| dtlb_prot.S | ||
| ebus.c | ||
| entry.h | ||
| entry.S | ||
| etrap_32.S | ||
| etrap_64.S | ||
| fpu_traps.S | ||
| ftrace.c | ||
| getsetcc.S | ||
| head_32.S | ||
| head_64.S | ||
| helpers.S | ||
| hvapi.c | ||
| hvcalls.S | ||
| hvtramp.S | ||
| idprom.c | ||
| init_task.c | ||
| iommu_common.h | ||
| iommu.c | ||
| ioport.c | ||
| irq_32.c | ||
| irq_64.c | ||
| irq.h | ||
| itlb_miss.S | ||
| ivec.S | ||
| kernel.h | ||
| kgdb_32.c | ||
| kgdb_64.c | ||
| kprobes.c | ||
| kstack.h | ||
| ktlb.S | ||
| ldc.c | ||
| led.c | ||
| Makefile | ||
| mdesc.c | ||
| misctrap.S | ||
| module.c | ||
| muldiv.c | ||
| nmi.c | ||
| of_device_32.c | ||
| of_device_64.c | ||
| of_device_common.c | ||
| of_device_common.h | ||
| pci_common.c | ||
| pci_fire.c | ||
| pci_impl.h | ||
| pci_msi.c | ||
| pci_psycho.c | ||
| pci_sabre.c | ||
| pci_schizo.c | ||
| pci_sun4v_asm.S | ||
| pci_sun4v.c | ||
| pci_sun4v.h | ||
| pci.c | ||
| pcic.c | ||
| pcr.c | ||
| pmc.c | ||
| power.c | ||
| process_32.c | ||
| process_64.c | ||
| prom_32.c | ||
| prom_64.c | ||
| prom_common.c | ||
| prom_irqtrans.c | ||
| prom.h | ||
| psycho_common.c | ||
| psycho_common.h | ||
| ptrace_32.c | ||
| ptrace_64.c | ||
| reboot.c | ||
| rtrap_32.S | ||
| rtrap_64.S | ||
| sbus.c | ||
| setup_32.c | ||
| setup_64.c | ||
| signal32.c | ||
| signal_32.c | ||
| signal_64.c | ||
| smp_32.c | ||
| smp_64.c | ||
| sparc_ksyms_32.c | ||
| sparc_ksyms_64.c | ||
| spiterrs.S | ||
| sstate.c | ||
| stacktrace.c | ||
| starfire.c | ||
| sun4c_irq.c | ||
| sun4d_irq.c | ||
| sun4d_smp.c | ||
| sun4m_irq.c | ||
| sun4m_smp.c | ||
| sun4v_ivec.S | ||
| sun4v_tlb_miss.S | ||
| sys32.S | ||
| sys_sparc32.c | ||
| sys_sparc_32.c | ||
| sys_sparc_64.c | ||
| syscalls.S | ||
| sysfs.c | ||
| systbls_32.S | ||
| systbls_64.S | ||
| systbls.h | ||
| tadpole.c | ||
| tick14.c | ||
| time_32.c | ||
| time_64.c | ||
| trampoline_32.S | ||
| trampoline_64.S | ||
| traps_32.c | ||
| traps_64.c | ||
| tsb.S | ||
| ttable.S | ||
| una_asm_32.S | ||
| una_asm_64.S | ||
| unaligned_32.c | ||
| unaligned_64.c | ||
| us2e_cpufreq.c | ||
| us3_cpufreq.c | ||
| utrap.S | ||
| vio.c | ||
| viohs.c | ||
| visemul.c | ||
| vmlinux.lds.S | ||
| windows.c | ||
| winfixup.S | ||
| wof.S | ||
| wuf.S | ||