[PATCH] x86: Find offset for crashkernel reservation automatically
yhlu.kernel at gmail.com
Mon Jul 14 13:06:48 EDT 2008
On Mon, Jul 14, 2008 at 2:44 AM, Eric W. Biederman
<ebiederm at xmission.com> wrote:
> Bernhard Walle <bwalle at 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
> 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?
More information about the kexec