mm/debug: print head flags in dump_page

Tail page flags contain very little useful information.  Print the head
page's flags instead.  While the flags will contain "head" for tail pages,
this should not be too confusing as the previous line starts with the word
"head:" and so the flags should be interpreted as belonging to the head
page.

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>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: William Kucharski <william.kucharski@oracle.com>
Link: http://lkml.kernel.org/r/20200709202117.7216-4-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/debug.c b/mm/debug.c
index b0ebf83eec8995967387430234101597c2cae0d3..27837c18027caf957e0c63f7499644a78f630da7 100644 (file)
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -168,7 +168,7 @@ void __dump_page(struct page *page, const char *reason)
 out_mapping:
        BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
 
-       pr_warn("%sflags: %#lx(%pGp)%s\n", type, page->flags, &page->flags,
+       pr_warn("%sflags: %#lx(%pGp)%s\n", type, head->flags, &head->flags,
                page_cma ? " CMA" : "");
 
 hex_only: