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Changing PG_slab from a page flag to a page type in commit46df8e73a4("mm: free up PG_slab") in has the unintended consequence of removing the PG_slab constant from kernel debuginfo. The commit does add the value to the vmcoreinfo note, which allows debuggers to find the value without hardcoding it. However it's most flexible to continue representing the constant with an enum. To that end, convert the page type fields into an enum. Debuggers will now be able to detect that PG_slab's type has changed from enum pageflags to enum pagetype. Link: https://lkml.kernel.org/r/20240607202954.1198180-1-stephen.s.brennan@oracle.com Fixes:46df8e73a4("mm: free up PG_slab") Signed-off-by: Stephen Brennan <stephen.s.brennan@oracle.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: David Hildenbrand <david@redhat.com> Cc: Hao Ge <gehao@kylinos.cn> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Omar Sandoval <osandov@osandov.com> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>