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mm/page_isolation: tracing: trace all test_pages_isolated failures 

Some test_pages_isolated failure conditions don't include trace points.
For debugging issues caused by "pinned" pages, make sure to trace all
calls whether they succeed or fail.  In this case, a failure case did not
result in a trace point.  So add the missing failure case in
test_pages_isolated traces.

Link: https://lkml.kernel.org/r/20210823202823.13765-1-george_davis@mentor.com
Signed-off-by: George G. Davis <davis.george@siemens.com>
Cc: Eugeniu Rosca <erosca@de.adit-jv.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
George G. Davis 2021-09-02 14:58:16 -07:00 committed by Linus Torvalds
parent 88dc6f2088
commit 1d09510bcc
1 changed files with 10 additions and 3 deletions
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13
mm/page_isolation.c
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@ -287,6 +287,7 @@ 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
@ -299,15 +300,21 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
break;
}
page = __first_valid_page(start_pfn, end_pfn - start_pfn);
if ((pfn < end_pfn) || !page)
return -EBUSY;
if ((pfn < end_pfn) || !page) {
ret = -EBUSY;
goto out;
}
/* Check all pages are free or marked as ISOLATED */
zone = page_zone(page);
spin_lock_irqsave(&zone->lock, flags);
pfn = __test_page_isolated_in_pageblock(start_pfn, end_pfn, isol_flags);
spin_unlock_irqrestore(&zone->lock, flags);
ret = pfn < end_pfn ? -EBUSY : 0;
out:
trace_test_pages_isolated(start_pfn, end_pfn, pfn);
return pfn < end_pfn ? -EBUSY : 0;
return ret;
}