Commit 54a75157 authored Aug 06, 2020 by Matthew Wilcox (Oracle) Committed by Linus Torvalds Aug 07, 2020

mm/debug: print hashed address of struct page



The actual address of the struct page isn't particularly helpful, while
the hashed address helps match with other messages elsewhere.  Add the PFN
that the page refers to in order to help diagnose problems where the page
is improperly aligned for the purpose.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: William Kucharski <william.kucharski@oracle.com>
Link: http://lkml.kernel.org/r/20200709202117.7216-7-willy@infradead.org


Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 9bdaf2cc

mm/debug.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -95,17 +95,17 @@ void __dump_page(struct page page, const char reason)
		*/
		mapcount = PageSlab(head) ? 0 : page_mapcount(page);

		pr_warn("page:%px refcount:%d mapcount:%d mapping:%p index:%#lx\n",
		pr_warn("page:%p refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n",
		page, page_ref_count(head), mapcount, mapping,
		page_to_pgoff(page));
		page_to_pgoff(page), page_to_pfn(page));
		if (compound) {
		if (hpage_pincount_available(page)) {
		pr_warn("head:%px order:%u compound_mapcount:%d compound_pincount:%d\n",
		pr_warn("head:%p order:%u compound_mapcount:%d compound_pincount:%d\n",
		head, compound_order(head),
		compound_mapcount(head),
		compound_pincount(head));
		} else {
		pr_warn("head:%px order:%u compound_mapcount:%d\n",
		pr_warn("head:%p order:%u compound_mapcount:%d\n",
		head, compound_order(head),
		compound_mapcount(head));
		}

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