| Date | Fri, 10 Dec 2021 10:43:15 -0600 | From | Rob Herring <> | Subject | Re: [PATCH v17 09/10] of: fdt: Add memory for devices by DT property "linux,usable-memory-range" |
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On Fri, 10 Dec 2021 14:55:32 +0800, Zhen Lei wrote: > From: Chen Zhou <chenzhou10@huawei.com> > > When reserving crashkernel in high memory, some low memory is reserved > for crash dump kernel devices and never mapped by the first kernel. > This memory range is advertised to crash dump kernel via DT property > under /chosen, > linux,usable-memory-range = <BASE1 SIZE1 [BASE2 SIZE2]> > > We reused the DT property linux,usable-memory-range and made the low > memory region as the second range "BASE2 SIZE2", which keeps compatibility > with existing user-space and older kdump kernels. > > Crash dump kernel reads this property at boot time and call memblock_add() > to add the low memory region after memblock_cap_memory_range() has been > called. > > Signed-off-by: Chen Zhou <chenzhou10@huawei.com> > Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> > Tested-by: Dave Kleikamp <dave.kleikamp@oracle.com> > --- > drivers/of/fdt.c | 33 +++++++++++++++++++++++---------- > 1 file changed, 23 insertions(+), 10 deletions(-) >
Reviewed-by: Rob Herring <robh@kernel.org>
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