From: Vlastimil Babka vbabka@suse.cz
commit 5b57b8f22709f07c0ab5921c94fd66e8c59c3e11 upstream.
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@suse.cz Fixes: 76a1850e4572 ("mm/debug.c: __dump_page() prints an extra line") Signed-off-by: Vlastimil Babka vbabka@suse.cz Reported-by: Anshuman Khandual anshuman.khandual@arm.com Reported-by: Michal Hocko mhocko@kernel.org Acked-by: Michal Hocko mhocko@suse.com Cc: David Hildenbrand david@redhat.com Cc: Qian Cai cai@lca.pw Cc: Oscar Salvador osalvador@suse.de Cc: Mel Gorman mgorman@techsingularity.net Cc: Mike Rapoport rppt@linux.ibm.com Cc: Dan Williams dan.j.williams@intel.com Cc: Pavel Tatashin pavel.tatashin@microsoft.com Cc: Ralph Campbell rcampbell@nvidia.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- mm/debug.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
--- a/mm/debug.c +++ b/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,