mm, debug: replace dump_flags() with the new printk formats

With the new printk format strings for flags, we can get rid of
dump_flags() in mm/debug.c.

This also fixes dump_vma() which used dump_flags() for printing vma
flags.  However dump_flags() did a page-flags specific filtering of bits
higher than NR_PAGEFLAGS in order to remove the zone id part.  For
dump_vma() this resulted in removing several VM_* flags from the
symbolic translation.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 14 insertions, 46 deletions

diff --git a/mm/debug.c b/mm/debug.c
index 0328fd377545..231e1452a912 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -28,36 +28,6 @@ const struct trace_print_flags vmaflag_names[] = {
         {0, NULL}
 };
 
-static void dump_flags(unsigned long flags,
-                        const struct trace_print_flags *names, int count)
-{
-        const char *delim = "";
-        unsigned long mask;
-        int i;
-
-        pr_emerg("flags: %#lx(", flags);
-
-        /* remove zone id */
-        flags &= (1UL << NR_PAGEFLAGS) - 1;
-
-        for (i = 0; i < count && flags; i++) {
-
-                mask = names[i].mask;
-                if ((flags & mask) != mask)
-                        continue;
-
-                flags &= ~mask;
-                pr_cont("%s%s", delim, names[i].name);
-                delim = "|";
-        }
-
-        /* check for left over flags */
-        if (flags)
-                pr_cont("%s%#lx", delim, flags);
-
-        pr_cont(")\n");
-}
-
 void dump_page_badflags(struct page *page, const char *reason,
                 unsigned long badflags)
 {
@@ -68,15 +38,15 @@ void dump_page_badflags(struct page *page, const char *reason,
                 pr_cont(" compound_mapcount: %d", compound_mapcount(page));
         pr_cont("\n");
         BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
-        dump_flags(page->flags, pageflag_names,
-                                        ARRAY_SIZE(pageflag_names) - 1);
+        pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
+
         if (reason)
                 pr_alert("page dumped because: %s\n", reason);
-        if (page->flags & badflags) {
-                pr_alert("bad because of flags:\n");
-                dump_flags(page->flags & badflags, pageflag_names,
-                                        ARRAY_SIZE(pageflag_names) - 1);
-        }
+
+        badflags &= page->flags;
+        if (badflags)
+                pr_alert("bad because of flags: %#lx(%pGp)\n", badflags,
+                                                                &badflags);
 #ifdef CONFIG_MEMCG
         if (page->mem_cgroup)
                 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
@@ -96,13 +66,14 @@ void dump_vma(const struct vm_area_struct *vma)
         pr_emerg("vma %p start %p end %p\n"
                 "next %p prev %p mm %p\n"
                 "prot %lx anon_vma %p vm_ops %p\n"
-                "pgoff %lx file %p private_data %p\n",
+                "pgoff %lx file %p private_data %p\n"
+                "flags: %#lx(%pGv)\n",
                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
                 vma->vm_prev, vma->vm_mm,
                 (unsigned long)pgprot_val(vma->vm_page_prot),
                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
-                vma->vm_file, vma->vm_private_data);
-        dump_flags(vma->vm_flags, vmaflag_names, ARRAY_SIZE(vmaflag_names) - 1);
+                vma->vm_file, vma->vm_private_data,
+                vma->vm_flags, &vma->vm_flags);
 }
 EXPORT_SYMBOL(dump_vma);
 
@@ -136,7 +107,7 @@ void dump_mm(const struct mm_struct *mm)
 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
                 "tlb_flush_pending %d\n"
 #endif
-                "%s",   /* This is here to hold the comma */
+                "def_flags: %#lx(%pGv)\n",
 
                 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
 #ifdef CONFIG_MMU
@@ -170,11 +141,8 @@ void dump_mm(const struct mm_struct *mm)
 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
                 mm->tlb_flush_pending,
 #endif
-                ""              /* This is here to not have a comma! */
-                );
-
-                dump_flags(mm->def_flags, vmaflag_names,
-                                ARRAY_SIZE(vmaflag_names) - 1);
+                mm->def_flags, &mm->def_flags
+        );
 }
 
 #endif          /* CONFIG_DEBUG_VM */