+ mm-debug-use-%pgt-to-display-page_type-in-dump_page.patch added to mm-unstable branch

+ mm-debug-use-%pgt-to-display-page_type-in-dump_page.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/debug: use %pGt to display page_type in dump_page()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-debug-use-%pgt-to-display-page_type-in-dump_page.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-debug-use-%pgt-to-display-page_type-in-dump_page.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Subject: mm/debug: use %pGt to display page_type in dump_page()
Date: Mon, 30 Jan 2023 13:25:14 +0900

Some page flags are stored in page_type rather than ->flags field.
Use newly introduced page type %pGt in dump_page().

Below are some examples:

page:00000000da7184dd refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101cb3
flags: 0x2ffff0000000000(node=0|zone=2|lastcpupid=0xffff)
page_type: 0xffffffff()
raw: 02ffff0000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: newly allocated page

page:00000000da7184dd refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x101cb3
flags: 0x2ffff0000000000(node=0|zone=2|lastcpupid=0xffff)
page_type: 0xffffff7f(buddy)
raw: 02ffff0000000000 ffff88813fff8e80 ffff88813fff8e80 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffff7f 0000000000000000
page dumped because: freed page

page:0000000042202316 refcount:3 mapcount:2 mapping:0000000000000000 index:0x7f634722a pfn:0x11994e
memcg:ffff888100135000
anon flags: 0x2ffff0000080024(uptodate|active|swapbacked|node=0|zone=2|lastcpupid=0xffff)
page_type: 0x1()
raw: 02ffff0000080024 0000000000000000 dead000000000122 ffff8881193398f1
raw: 00000007f634722a 0000000000000000 0000000300000001 ffff888100135000
page dumped because: user-mapped page

Link: https://lkml.kernel.org/r/20230130042514.2418-4-42.hyeyoo@gmail.com
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


diff --git a/mm/debug.c~mm-debug-use-%pgt-to-display-page_type-in-dump_page b/mm/debug.c
--- a/mm/debug.c~mm-debug-use-%pgt-to-display-page_type-in-dump_page
+++ b/mm/debug.c
@@ -120,6 +120,8 @@ static void __dump_page(struct page *page)
 
 	pr_warn("%sflags: %pGp%s\n", type, &head->flags,
 		page_cma ? " CMA" : "");
+	pr_warn("page_type: %pGt\n", &head->page_type);
+
 	print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32,
 			sizeof(unsigned long), page,
 			sizeof(struct page), false);
_

Patches currently in -mm which might be from 42.hyeyoo@gmail.com are

mmflagsh-use-less-error-prone-method-to-define-pageflag_names.patch
mm-printk-introduce-new-format-%pgt-for-page_type.patch
mm-debug-use-%pgt-to-display-page_type-in-dump_page.patch