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>

diff --git a/mm/debug.c b/mm/debug.c
index c4dbe4def83dae735781f534982441d05fa25431..8f569db9a51460bddf5e19f57b812f397f342ce6 100644 (file)
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -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));
                }