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[PATCH] memory hotplug prep: fixup bad_range()

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When doing memory hotplug operations, the size of existing zones can obviously
change.  This means that zone->zone_{start_pfn,spanned_pages} can change.

There are currently no locks that protect these structure members.  However,
they are rarely accessed at runtime.  Outside of swsusp, the only place that I
can find is bad_range().

So, split bad_range() up into two pieces: one that needs to be locked and
anther that doesn't.

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dave Hansen 2005-10-29 18:16:52 -07:00 committed by Linus Torvalds
parent 4ca644d970
commit c6a57e19e4
1 changed files with 21 additions and 5 deletions
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26
mm/page_alloc.c
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@ -78,21 +78,37 @@ int min_free_kbytes = 1024;
unsigned long __initdata nr_kernel_pages; unsigned long __initdata nr_kernel_pages;
unsigned long __initdata nr_all_pages; unsigned long __initdata nr_all_pages;
/* static int page_outside_zone_boundaries(struct zone *zone, struct page *page)
* Temporary debugging check for pages not lying within a given zone.
*/
static int bad_range(struct zone *zone, struct page *page)
{ {
if (page_to_pfn(page) >= zone->zone_start_pfn + zone->spanned_pages) if (page_to_pfn(page) >= zone->zone_start_pfn + zone->spanned_pages)
return 1; return 1;
if (page_to_pfn(page) < zone->zone_start_pfn) if (page_to_pfn(page) < zone->zone_start_pfn)
return 1; return 1;
return 0;
}
static int page_is_consistent(struct zone *zone, struct page *page)
{
#ifdef CONFIG_HOLES_IN_ZONE #ifdef CONFIG_HOLES_IN_ZONE
if (!pfn_valid(page_to_pfn(page))) if (!pfn_valid(page_to_pfn(page)))
return 1; return 0;
#endif #endif
if (zone != page_zone(page)) if (zone != page_zone(page))
return 0;
return 1;
}
/*
* Temporary debugging check for pages not lying within a given zone.
*/
static int bad_range(struct zone *zone, struct page *page)
{
if (page_outside_zone_boundaries(zone, page))
return 1; return 1;
if (!page_is_consistent(zone, page))
return 1;
return 0; return 0;
} }