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mm/page_isolation.c: return last tested pfn rather than failure indicator 

This is preparation step to report test failed pfn in new tracepoint to
analyze cma allocation failure problem.  There is no functional change
in this patch.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Minchan Kim <minchan@kernel.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joonsoo Kim 2016-01-14 15:18:39 -08:00 committed by Linus Torvalds
parent 4a8c7bb59a
commit fea85cff11
1 changed files with 6 additions and 7 deletions
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13
mm/page_isolation.c
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@ -212,7 +212,7 @@ int undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
*
* Returns 1 if all pages in the range are isolated.
*/
static int
static unsigned long
__test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn,
bool skip_hwpoisoned_pages)
{
@ -237,9 +237,8 @@ __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn,
else
break;
}
if (pfn < end_pfn)
return 0;
return 1;
return pfn;
}
int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
@ -248,7 +247,6 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
unsigned long pfn, flags;
struct page *page;
struct zone *zone;
int ret;
/*
* Note: pageblock_nr_pages != MAX_ORDER. Then, chunks of free pages
@ -266,10 +264,11 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
/* Check all pages are free or marked as ISOLATED */
zone = page_zone(page);
spin_lock_irqsave(&zone->lock, flags);
ret = __test_page_isolated_in_pageblock(start_pfn, end_pfn,
pfn = __test_page_isolated_in_pageblock(start_pfn, end_pfn,
skip_hwpoisoned_pages);
spin_unlock_irqrestore(&zone->lock, flags);
return ret ? 0 : -EBUSY;
return pfn < end_pfn ? -EBUSY : 0;
}
struct page *alloc_migrate_target(struct page *page, unsigned long private,