mm: remove PageActive

Patch series "Simplify the page flags a little".

In the course of our folio conversions, we have made many page flags only
used on folios, so we can now remove the page-based accessors.  This
should cut down compile time a little, and prevent new users from cropping
up.

There is more that could be done in this area, but it would produce merge
conflicts, so I'll sit on those patches until next merge window.  We now
have line of sight to removing PG_private_2 and PG_private.


This patch (of 10):

This flag is now only used on folios, so we can remove all the page
accessors.

[akpm@linux-foundation.org: fix arch/powerpc/mm/pgtable-frag.c]
Link: https://lkml.kernel.org/r/20240821193445.2294269-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20240821193445.2294269-2-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/powerpc/mm/pgtable-frag.c

@@ -136,10 +136,10 @@ void pte_fragment_free(unsigned long *table, int kernel)
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable)
 {
-	struct page *page;
+	struct folio *folio;
 
-	page = virt_to_page(pgtable);
-	SetPageActive(page);
+	folio = virt_to_folio(pgtable);
+	folio_set_active(folio);
 	pte_fragment_free((unsigned long *)pgtable, 0);
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */

include/linux/page-flags.h

@@ -510,8 +510,9 @@ PAGEFLAG(Dirty, dirty, PF_HEAD) TESTSCFLAG(Dirty, dirty, PF_HEAD)
 	__CLEARPAGEFLAG(Dirty, dirty, PF_HEAD)
 PAGEFLAG(LRU, lru, PF_HEAD) __CLEARPAGEFLAG(LRU, lru, PF_HEAD)
 	TESTCLEARFLAG(LRU, lru, PF_HEAD)
-PAGEFLAG(Active, active, PF_HEAD) __CLEARPAGEFLAG(Active, active, PF_HEAD)
-	TESTCLEARFLAG(Active, active, PF_HEAD)
+FOLIO_FLAG(active, FOLIO_HEAD_PAGE)
+	__FOLIO_CLEAR_FLAG(active, FOLIO_HEAD_PAGE)
+	FOLIO_TEST_CLEAR_FLAG(active, FOLIO_HEAD_PAGE)
 PAGEFLAG(Workingset, workingset, PF_HEAD)
 	TESTCLEARFLAG(Workingset, workingset, PF_HEAD)
 PAGEFLAG(Checked, checked, PF_NO_COMPOUND)	   /* Used by some filesystems */