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author | Wei Yang <richard.weiyang@gmail.com> | 2018-12-28 00:36:18 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 12:11:49 -0800 |
commit | 23b68cfaae0ea40a9509fad37b756a6916dec54e (patch) | |
tree | 164b7b8e89281a52b32b81d90332c24b85d95c78 /include/linux/mmzone.h | |
parent | 9a1ea439b16b92002e0a6fceebc5d1794906e297 (diff) | |
download | linux-stable-23b68cfaae0ea40a9509fad37b756a6916dec54e.tar.gz linux-stable-23b68cfaae0ea40a9509fad37b756a6916dec54e.tar.bz2 linux-stable-23b68cfaae0ea40a9509fad37b756a6916dec54e.zip |
mm: check nr_initialised with PAGES_PER_SECTION directly in defer_init()
When DEFERRED_STRUCT_PAGE_INIT is configured, only the first section of
each node's highest zone is initialized before defer stage.
static_init_pgcnt is used to store the number of pages like this:
pgdat->static_init_pgcnt = min_t(unsigned long, PAGES_PER_SECTION,
pgdat->node_spanned_pages);
because we don't want to overflow zone's range.
But this is not necessary, since defer_init() is called like this:
memmap_init_zone()
for pfn in [start_pfn, end_pfn)
defer_init(pfn, end_pfn)
In case (pgdat->node_spanned_pages < PAGES_PER_SECTION), the loop would
stop before calling defer_init().
BTW, comparing PAGES_PER_SECTION with node_spanned_pages is not correct,
since nr_initialised is zone based instead of node based. Even
node_spanned_pages is bigger than PAGES_PER_SECTION, its highest zone
would have pages less than PAGES_PER_SECTION.
Link: http://lkml.kernel.org/r/20181122094807.6985-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r-- | include/linux/mmzone.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index e0c3bc2edbbd..a6e300732ec7 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -692,8 +692,6 @@ typedef struct pglist_data { * is the first PFN that needs to be initialised. */ unsigned long first_deferred_pfn; - /* Number of non-deferred pages */ - unsigned long static_init_pgcnt; #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ #ifdef CONFIG_TRANSPARENT_HUGEPAGE |