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SubjectRe: [PATCH - resend] Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel(v1)
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.

-hpa


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