The patch titled
Subject: include/linux/mmzone.h: simplify zone_intersects()
has been added to the -mm tree. Its filename is
mm-memory_hotplug-do-not-associate-hotadded-memory-to-zones-until-online-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-do-not-associate-hotadded-memory-to-zones-until-online-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-do-not-associate-hotadded-memory-to-zones-until-online-fix.patch
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: include/linux/mmzone.h: simplify zone_intersects()
To make sure a range intersects a zone, only two comparisons are
necessary. Simplify the function a little.
Link: http://lkml.kernel.org/r/20170616092335.5177-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mmzone.h | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff -puN include/linux/mmzone.h~mm-memory_hotplug-do-not-associate-hotadded-memory-to-zones-until-online-fix include/linux/mmzone.h
--- a/include/linux/mmzone.h~mm-memory_hotplug-do-not-associate-hotadded-memory-to-zones-until-online-fix
+++ a/include/linux/mmzone.h
@@ -541,15 +541,11 @@ static inline bool zone_intersects(struc
{
if (zone_is_empty(zone))
return false;
- if (start_pfn >= zone_end_pfn(zone))
+ if (start_pfn >= zone_end_pfn(zone) ||
+ start_pfn + nr_pages <= zone->zone_start_pfn)
return false;
- if (zone->zone_start_pfn <= start_pfn)
- return true;
- if (start_pfn + nr_pages > zone->zone_start_pfn)
- return true;
-
- return false;
+ return true;
}
/*
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-slub-remove-a-redundant-assignment-in-___slab_alloc.patch
mm-slub-reset-cpu_slabs-pointer-in-deactivate_slab.patch
mm-slub-pack-red_left_pad-with-another-int-to-save-a-word.patch
mm-slub-wrap-cpu_slab-partial-in-config_slub_cpu_partial.patch
mm-slub-wrap-kmem_cache-cpu_partial-in-config-config_slub_cpu_partial.patch
mm-nobootmem-return-0-when-start_pfn-equals-end_pfn.patch
mm-memory_hotplug-do-not-associate-hotadded-memory-to-zones-until-online-fix.patch
mm-page_alloc-return-0-in-case-this-node-has-no-page-within-the-zone.patch
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