mm, x86: remove MEMORY_HOTPLUG_RESERVE related code
authorYinghai Lu <yinghai@kernel.org>
Fri, 15 May 2009 20:59:37 +0000 (13:59 -0700)
committerIngo Molnar <mingo@elte.hu>
Mon, 18 May 2009 07:13:31 +0000 (09:13 +0200)
commit888a589f6be07d624e21e2174d98375e9f95911b
tree5c2c210796a114479807f41fc15fe69805d66074
parentb286e21868ea1af724a7a4802da2c8e144fa70de
mm, x86: remove MEMORY_HOTPLUG_RESERVE related code

after:

 | commit b263295dbffd33b0fbff670720fa178c30e3392a
 | Author: Christoph Lameter <clameter@sgi.com>
 | Date:   Wed Jan 30 13:30:47 2008 +0100
 |
 |    x86: 64-bit, make sparsemem vmemmap the only memory model

we don't have MEMORY_HOTPLUG_RESERVE anymore.

Historically, x86-64 had an architecture-specific method for memory hotplug
whereby it scanned the SRAT for physical memory ranges that could be
potentially used for memory hot-add later. By reserving those ranges
without physical memory, the memmap would be allocated and left dormant
until needed. This depended on the DISCONTIG memory model which has been
removed so the code implementing HOTPLUG_RESERVE is now dead.

This patch removes the dead code used by MEMORY_HOTPLUG_RESERVE.

(Changelog authored by Mel.)

v2: updated changelog, and remove hotadd= in doc

[ Impact: remove dead code ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: Mel Gorman <mel@csn.ul.ie>
Workflow-found-OK-by: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <4A0C4910.7090508@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Documentation/x86/x86_64/boot-options.txt
arch/x86/include/asm/numa_64.h
arch/x86/mm/numa_64.c
arch/x86/mm/srat_64.c
include/linux/mm.h
mm/page_alloc.c