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SubjectRe: [PATCH 1/2 v8] resource: add the new I/O resource descriptor 'IORES_DESC_RESERVED'
On 11/29/18 at 04:09pm, Lianbo Jiang wrote:
> When doing kexec_file_load, the first kernel needs to pass the e820
> reserved ranges to the second kernel. But kernel can not exactly
> match the e820 reserved ranges when walking through the iomem resources
> with the descriptor 'IORES_DESC_NONE', because several e820 types(
> e.g. E820_TYPE_RESERVED_KERN/E820_TYPE_RAM/E820_TYPE_UNUSABLE/E820
> _TYPE_RESERVED) are converted to the descriptor 'IORES_DESC_NONE'. It
> may pass these four types to the kdump kernel, that is not desired result.
>
> So, this patch adds a new I/O resource descriptor 'IORES_DESC_RESERVED'
> for the iomem resources search interfaces. It is helpful to exactly
> match the reserved resource ranges when walking through iomem resources.
>
> In addition, since the new descriptor 'IORES_DESC_RESERVED' is introduced,
> these code originally related to the descriptor 'IORES_DESC_NONE' need to
> be updated. Otherwise, it will be easily confused and also cause some
> errors. Because the 'E820_TYPE_RESERVED' type is converted to the new
> descriptor 'IORES_DESC_RESERVED' instead of 'IORES_DESC_NONE', it has been
> changed.
>
> Suggested-by: Dave Young <dyoung@redhat.com>

This was suggested by Boris instead :)

> Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
> ---
> arch/ia64/kernel/efi.c | 4 ++++
> arch/x86/kernel/e820.c | 2 +-
> arch/x86/mm/ioremap.c | 13 ++++++++++++-
> include/linux/ioport.h | 1 +
> kernel/resource.c | 6 +++---
> 5 files changed, 21 insertions(+), 5 deletions(-)
>
>
[snip]

Thanks
Dave

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