On 01/05/24 at 08:49am, Andrew Morton wrote:
> 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").
Yes.
>
> Also, is this a regression? Were earlier kernels OK?
It's a regression, will impact arm64 in v6.6 kernel. Add below too?
Cc: <stable@xxxxxxxxxxxxxxx> # 6.6.x
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