Commit b9eb6319 authored May 19, 2016 by Joonsoo Kim Committed by Linus Torvalds May 19, 2016

mm/memory_hotplug: add comment to some functions related to memory hotplug



__offline_isolated_pages() and test_pages_isolated() are used by memory
hotplug.  These functions require that range is in a single zone but
there is no code to do this because memory hotplug checks it before
calling these functions.  To avoid confusing future user of these
functions, this patch adds comments to them.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Laura Abbott <lauraa@codeaurora.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent f44b2dda

mm/page_alloc.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -7176,7 +7176,8 @@ void zone_pcp_reset(struct zone *zone)

		#ifdef CONFIG_MEMORY_HOTREMOVE
		/*
		* All pages in the range must be isolated before calling this.
		* All pages in the range must be in a single zone and isolated
		* before calling this.
		*/
		void
		__offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)

mm/page_isolation.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -246,6 +246,7 @@ __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn,
		return pfn;
		}

		/* Caller should ensure that requested range is in a single zone */
		int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
		bool skip_hwpoisoned_pages)
		{

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