[patch 046/163] mm/debug: print head flags in dump_page

Andrew Morton
2020-08-07T06:19:42Z

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: 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.

Link: http://lkml.kernel.org/r/20200709202117.7216-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: William Kucharski <william.kucharski@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

mm/debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/debug.c~mm-print-head-flags-in-dump_page
+++ a/mm/debug.c
@@ -168,7 +168,7 @@ void __dump_page(struct page *page, cons
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:
_