On Fri, 29 Dec 2023 16:02:13 +0800 Huacai Chen <chenhuacai@xxxxxxxxxxx> wrote: > In /proc/iomem, sub-regions should be inserted after their parent, > otherwise the insertion of parent resource fails. But after generic > crashkernel reservation applied, in both RISC-V and ARM64 (LoongArch > will also use generic reservation later on), crashkernel resources are > inserted before their parent, which causes the parent disappear in > /proc/iomem. So we defer the insertion of crashkernel resources to an > early_initcall(). > > ... > > --- a/kernel/crash_core.c > +++ b/kernel/crash_core.c > @@ -377,7 +377,6 @@ static int __init reserve_crashkernel_low(unsigned long long low_size) > > crashk_low_res.start = low_base; > crashk_low_res.end = low_base + low_size - 1; > - insert_resource(&iomem_resource, &crashk_low_res); > #endif > return 0; > } > @@ -459,8 +458,19 @@ void __init reserve_crashkernel_generic(char *cmdline, > > crashk_res.start = crash_base; > crashk_res.end = crash_base + crash_size - 1; > - insert_resource(&iomem_resource, &crashk_res); > } > + > +static __init int insert_crashkernel_resources(void) > +{ > + if (crashk_res.start < crashk_res.end) > + insert_resource(&iomem_resource, &crashk_res); > + > + if (crashk_low_res.start < crashk_low_res.end) > + insert_resource(&iomem_resource, &crashk_low_res); > + > + return 0; > +} > +early_initcall(insert_crashkernel_resources); > #endif > > int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map, I'm thinking Fixes: 0ab97169aa0 ("crash_core: add generic function to do reservation"). Also, is this a regression? Were earlier kernels OK? _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec