The patch titled Subject: mm/debug.c: always print flags in dump_page() has been added to the -mm tree. Its filename is mm-debug-always-print-flags-in-dump_page.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-debug-always-print-flags-in-dump_page.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-debug-always-print-flags-in-dump_page.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Vlastimil Babka <vbabka@xxxxxxx> Subject: mm/debug.c: always print flags in dump_page() Commit 76a1850e4572 ("mm/debug.c: __dump_page() prints an extra line") inadvertently removed printing of page flags for pages that are neither anon nor ksm nor have a mapping. Fix that. Using pr_cont() again would be a solution, but the commit explicitly removed its use. Avoiding the danger of mixing up split lines from multiple CPUs might be beneficial for near-panic dumps like this, so fix this without reintroducing pr_cont(). Link: http://lkml.kernel.org/r/9f884d5c-ca60-dc7b-219c-c081c755fab6@xxxxxxx Fixes: 76a1850e4572 ("mm/debug.c: __dump_page() prints an extra line") Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx> Reported-by: Anshuman Khandual <anshuman.khandual@xxxxxxx> Reported-by: Michal Hocko <mhocko@xxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Cc: David Hildenbrand <david@xxxxxxxxxx> Cc: Qian Cai <cai@xxxxxx> Cc: Oscar Salvador <osalvador@xxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx> Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Cc: Pavel Tatashin <pavel.tatashin@xxxxxxxxxxxxx> Cc: Ralph Campbell <rcampbell@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/debug.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/mm/debug.c~mm-debug-always-print-flags-in-dump_page +++ a/mm/debug.c @@ -47,6 +47,7 @@ void __dump_page(struct page *page, cons struct address_space *mapping; bool page_poisoned = PagePoisoned(page); int mapcount; + char *type = ""; /* * If struct page is poisoned don't access Page*() functions as that @@ -78,9 +79,9 @@ void __dump_page(struct page *page, cons page, page_ref_count(page), mapcount, page->mapping, page_to_pgoff(page)); if (PageKsm(page)) - pr_warn("ksm flags: %#lx(%pGp)\n", page->flags, &page->flags); + type = "ksm "; else if (PageAnon(page)) - pr_warn("anon flags: %#lx(%pGp)\n", page->flags, &page->flags); + type = "anon "; else if (mapping) { if (mapping->host && mapping->host->i_dentry.first) { struct dentry *dentry; @@ -88,10 +89,11 @@ void __dump_page(struct page *page, cons pr_warn("%ps name:\"%pd\"\n", mapping->a_ops, dentry); } else pr_warn("%ps\n", mapping->a_ops); - pr_warn("flags: %#lx(%pGp)\n", page->flags, &page->flags); } BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1); + pr_warn("%sflags: %#lx(%pGp)\n", type, page->flags, &page->flags); + hex_only: print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32, sizeof(unsigned long), page, _ Patches currently in -mm which might be from vbabka@xxxxxxx are mm-debug-always-print-flags-in-dump_page.patch