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@xxxxxxxxxx> This was suggested by Boris instead :) > Signed-off-by: Lianbo Jiang <lijiang@xxxxxxxxxx> > --- > 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
