mmflags.h: use less error prone method to define pageflag_names

Patch series "mm, printk: introduce new format for page_type", v4.

This series moves PG_slab page flag to page_type, freeing one bit in
page->flags and introduces %pGt format that prints human-readable
page_type like %pGp for printing page flags.

See changelog of patch 2 for more implementation details.

Thanks everyone that gave valuable comments.


This patch (of 3):

Use helper macro to decrease chances of typo when defining pageflag_names.

Link: https://lkml.kernel.org/r/20230130042514.2418-1-42.hyeyoo@gmail.com
Link: https://lore.kernel.org/lkml/Y6AycLbpjVzXM5I9@smile.fi.intel.com
Link: https://lkml.kernel.org/r/20230130042514.2418-2-42.hyeyoo@gmail.com
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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