linux-kernel - [PATCH v6 1/3] mm, slub: use pGp to print page flags

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Date:   Sun, 14 Mar 2021 16:37:15 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     pmladek@...e.com, willy@...radead.org,
        andriy.shevchenko@...ux.intel.com, david@...hat.com,
        linmiaohe@...wei.com, vbabka@...e.cz, cl@...ux.com,
        penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        akpm@...ux-foundation.org, rostedt@...dmis.org,
        sergey.senozhatsky@...il.com, joe@...ches.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, lkp@...el.com,
        Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH v6 1/3] mm, slub: use pGp to print page flags

As pGp has been already introduced in printk, we'd better use it to make
the output human readable.

Before this change, the output is,
[ 6155.716018] INFO: Slab 0x000000004027dd4f objects=33 used=3 fp=0x000000008cd1579c flags=0x17ffffc0010200

While after this change, the output is,
[ 8846.517809] INFO: Slab 0x00000000f42a2c60 objects=33 used=3 fp=0x0000000060d32ca8 flags=0x17ffffc0010200(slab|head)

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
Reviewed-by: David Hildenbrand <david@...hat.com>
Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
Acked-by: David Rientjes <rientjes@...gle.com>
Acked-by: Christoph Lameter <cl@...ux.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 mm/slub.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 3021ce9bf1b3..ed3f728c1367 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -650,8 +650,9 @@ void print_tracking(struct kmem_cache *s, void *object)
 
 static void print_page_info(struct page *page)
 {
-	pr_err("INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n",
-	       page, page->objects, page->inuse, page->freelist, page->flags);
+	pr_err("INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=%#lx(%pGp)\n",
+	       page, page->objects, page->inuse, page->freelist,
+	       page->flags, &page->flags);
 
 }
 
-- 
2.18.2