在 2018年11月30日 11:41, Dave Young 写道: > 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 :) > Sorry for this, i forgot to change it. And i will correct this in next version. Thanks. >> 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 >
