Re: [PATCH 1/5] generic __remove_pages() support

On Thu, 06 Mar 2008 10:55:34 -0800 Badari Pulavarty wrote:

Generic helper function to remove section mappings and sysfs entries
for the section of the memory we are removing. offline_pages() correctly
adjusted zone and marked the pages reserved.

Such generic (exported, non-static) interfaces could use some
(kernel-)docs, please.

Issue: If mem_map, usemap allocation could come from different places -
kmalloc, vmalloc, alloc_pages or bootmem. There is no easy way
to find and free up bootmem allocations.

Signed-off-by: Badari Pulavarty <pbadari@xxxxxxxxxx>

---
include/linux/memory_hotplug.h | 4 +++
mm/memory_hotplug.c | 44 +++++++++++++++++++++++++++++++++++++++++
mm/sparse.c | 43 +++++++++++++++++++++++++++++++++++++---
3 files changed, 88 insertions(+), 3 deletions(-)

Index: linux-2.6.25-rc2/include/linux/memory_hotplug.h
===================================================================
--- linux-2.6.25-rc2.orig/include/linux/memory_hotplug.h 2008-02-27 12:58:17.000000000 -0800
+++ linux-2.6.25-rc2/include/linux/memory_hotplug.h 2008-02-27 13:00:04.000000000 -0800
@@ -64,6 +65,8 @@ extern int offline_pages(unsigned long,
/* reasonably generic interface to expand the physical pages in a zone */
extern int __add_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages);
+extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
+ unsigned long nr_pages);

/*
* Walk thorugh all memory which is registered as resource.

through :)

---
~Randy
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