linux-kernel - [PATCH 00/17] mm: zone & pgdat accessors plus some cleanup

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Date:	Tue, 15 Jan 2013 16:24:37 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Linux MM <linux-mm@...ck.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH 00/17] mm: zone & pgdat accessors plus some cleanup

Summaries:

01 - removes the use of zone_end_pfn as a local var name.
02 - adds zone_end_pfn(), zone_is_initialized(), zone_is_empty() and zone_spans_pfn()
03 - adds a VM_BUG using zone_is_initialized() in __free_one_page()

04 - add ensure_zone_is_initialized() (for memory_hotplug)
05 - use the above addition.

06 - add pgdat_end_pfn() and pgdat_is_empty()

07,08,09,10,11,12,16,17 - use the new helpers

13 - avoid repeating checks for section in page flags by adding a define.
14 - memory hotplug: factor out zone+pgdat growth.
15 - add debugging message to VM_BUG check.

As a general concern: spanned_pages & start_pfn (in pgdat & zone) are supposed
to be locked (via a seqlock) when read (due to changes to them via
memory_hotplug), but very few (only 1?) of their users appear to actually lock
them.

--

 include/linux/mm.h     |  8 ++++--
 include/linux/mmzone.h | 34 ++++++++++++++++++++++---
 mm/compaction.c        | 10 ++++----
 mm/kmemleak.c          |  5 ++--
 mm/memory_hotplug.c    | 68 ++++++++++++++++++++++++++++----------------------
 mm/page_alloc.c        | 31 +++++++++++++----------
 mm/vmstat.c            |  2 +-
 7 files changed, 100 insertions(+), 58 deletions(-)

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