Messages in this thread | | | Date | Mon, 14 Jul 2008 10:06:48 -0700 | From | "Yinghai Lu" <> | Subject | Re: [PATCH] x86: Find offset for crashkernel reservation automatically |
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On Mon, Jul 14, 2008 at 2:44 AM, Eric W. Biederman <ebiederm@xmission.com> wrote: > Bernhard Walle <bwalle@suse.de> writes: > >> * Yinghai Lu [2008-07-14 00:11]: >>> >>> should use min_t(u64, 1ULL<<32, max_low_pfn<<PAGE_SHIFT) replace ULONG_MAX >> >> Shouldn't we use min_t(u64, ULLONG_MAX, max_low_pfn<<PAGE_SHIFT), i.e. >> should we really limit the crashkernel to a 32 bit address on a 64 bit >> system? > > We should use the lowest physical address that meets our size and > alignment constraints. However there is no reason to make this be < > 4G or even < 1G. The worst case is that we reserve an area the kdump > kernel can't run out of. However /sbin/kexec should check for that as > the kexec on panic code is not necessarily a linux kernel.
for 64bit, kdump can start from address above 4g with bzImage?
YH
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