On 01/07/2010 07:32 PM, Zheng, Shaohui wrote:Resend the patch to the mailing-list, the original patch URL is http://patchwork.kernel.org/patch/69075/, it is not accepted without comments,
sent it again to review.
Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel
The new added memory can not be access by interface /dev/mem, because we do not
update the variable high_memory. This patch add a new e820 entry in e820 table,
and update max_pfn, max_low_pfn and high_memory.
We add a function update_pfn in file arch/x86/mm/init.c to udpate these
varibles. Memory hotplug does not make sense on 32-bit kernel, so we did not
concern it in this function.
Memory hotplug makes sense on 32-bit kernels, at least in virtual
environments.