mm: introduce memdesc_flags_t

Patch series "Add and use memdesc_flags_t".

At some point struct page will be separated from struct slab and struct
folio.  This is a step towards that by introducing a type for the 'flags'
word of all three structures.  This gives us a certain amount of type
safety by establishing that some of these unsigned longs are different
from other unsigned longs in that they contain things like node ID,
section number and zone number in the upper bits.  That lets us have
functions that can be easily called by anyone who has a slab, folio or
page (but not easily by anyone else) to get the node or zone.

There's going to be some unusual merge problems with this as some odd bits
of the kernel decide they want to print out the flags value or something
similar by writing page->flags and now they'll need to write page->flags.f
instead.  That's most of the churn here.  Maybe we should be removing
these things from the debug output?


This patch (of 11):

Wrap the unsigned long flags in a typedef.  In upcoming patches, this will
provide a strong hint that you can't just pass a random unsigned long to
functions which take this as an argument.

[willy@infradead.org: s/flags/flags.f/ in several architectures]
  Link: https://lkml.kernel.org/r/aKMgPRLD-WnkPxYm@casper.infradead.org
[nicola.vetrini@gmail.com: mips: fix compilation error]
  Link: https://lore.kernel.org/lkml/CA+G9fYvkpmqGr6wjBNHY=dRp71PLCoi2341JxOudi60yqaeUdg@mail.gmail.com/
  Link: https://lkml.kernel.org/r/20250825214245.1838158-1-nicola.vetrini@gmail.com
Link: https://lkml.kernel.org/r/20250805172307.1302730-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20250805172307.1302730-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Zi Yan <ziy@nvidia.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

37 files changed, 96 insertions, 96 deletions

diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index 9106ceac323c..7d2f93dc1e91 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -704,7 +704,7 @@ static inline void arc_slc_enable(void)
 
 void flush_dcache_folio(struct folio *folio)
 {
-	clear_bit(PG_dc_clean, &folio->flags);
+	clear_bit(PG_dc_clean, &folio->flags.f);
 	return;
 }
 EXPORT_SYMBOL(flush_dcache_folio);
@@ -889,8 +889,8 @@ void copy_user_highpage(struct page *to, struct page *from,
 
 	copy_page(kto, kfrom);
 
-	clear_bit(PG_dc_clean, &dst->flags);
-	clear_bit(PG_dc_clean, &src->flags);
+	clear_bit(PG_dc_clean, &dst->flags.f);
+	clear_bit(PG_dc_clean, &src->flags.f);
 
 	kunmap_atomic(kto);
 	kunmap_atomic(kfrom);
@@ -900,7 +900,7 @@ void clear_user_page(void *to, unsigned long u_vaddr, struct page *page)
 {
 	struct folio *folio = page_folio(page);
 	clear_page(to);
-	clear_bit(PG_dc_clean, &folio->flags);
+	clear_bit(PG_dc_clean, &folio->flags.f);
 }
 EXPORT_SYMBOL(clear_user_page);
 
diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c
index cae4a7aae0ed..ed6915ba76ec 100644
--- a/arch/arc/mm/tlb.c
+++ b/arch/arc/mm/tlb.c
@@ -488,7 +488,7 @@ void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
 	 */
 	if (vma->vm_flags & VM_EXEC) {
 		struct folio *folio = page_folio(page);
-		int dirty = !test_and_set_bit(PG_dc_clean, &folio->flags);
+		int dirty = !test_and_set_bit(PG_dc_clean, &folio->flags.f);
 		if (dirty) {
 			unsigned long offset = offset_in_folio(folio, paddr);
 			nr = folio_nr_pages(folio);
diff --git a/arch/arm/include/asm/hugetlb.h b/arch/arm/include/asm/hugetlb.h
index b766c4b373f6..700055b1ccb3 100644
--- a/arch/arm/include/asm/hugetlb.h
+++ b/arch/arm/include/asm/hugetlb.h
@@ -17,7 +17,7 @@
 
 static inline void arch_clear_hugetlb_flags(struct folio *folio)
 {
-	clear_bit(PG_dcache_clean, &folio->flags);
+	clear_bit(PG_dcache_clean, &folio->flags.f);
 }
 #define arch_clear_hugetlb_flags arch_clear_hugetlb_flags
 
diff --git a/arch/arm/mm/copypage-v4mc.c b/arch/arm/mm/copypage-v4mc.c
index 7ddd82b9fe8b..ed843bb22020 100644
--- a/arch/arm/mm/copypage-v4mc.c
+++ b/arch/arm/mm/copypage-v4mc.c
@@ -67,7 +67,7 @@ void v4_mc_copy_user_highpage(struct page *to, struct page *from,
 	struct folio *src = page_folio(from);
 	void *kto = kmap_atomic(to);
 
-	if (!test_and_set_bit(PG_dcache_clean, &src->flags))
+	if (!test_and_set_bit(PG_dcache_clean, &src->flags.f))
 		__flush_dcache_folio(folio_flush_mapping(src), src);
 
 	raw_spin_lock(&minicache_lock);
diff --git a/arch/arm/mm/copypage-v6.c b/arch/arm/mm/copypage-v6.c
index a1a71f36d850..0710dba5c0bf 100644
--- a/arch/arm/mm/copypage-v6.c
+++ b/arch/arm/mm/copypage-v6.c
@@ -73,7 +73,7 @@ static void v6_copy_user_highpage_aliasing(struct page *to,
 	unsigned int offset = CACHE_COLOUR(vaddr);
 	unsigned long kfrom, kto;
 
-	if (!test_and_set_bit(PG_dcache_clean, &src->flags))
+	if (!test_and_set_bit(PG_dcache_clean, &src->flags.f))
 		__flush_dcache_folio(folio_flush_mapping(src), src);
 
 	/* FIXME: not highmem safe */
diff --git a/arch/arm/mm/copypage-xscale.c b/arch/arm/mm/copypage-xscale.c
index f1e29d3e8193..e16af68d709f 100644
--- a/arch/arm/mm/copypage-xscale.c
+++ b/arch/arm/mm/copypage-xscale.c
@@ -87,7 +87,7 @@ void xscale_mc_copy_user_highpage(struct page *to, struct page *from,
 	struct folio *src = page_folio(from);
 	void *kto = kmap_atomic(to);
 
-	if (!test_and_set_bit(PG_dcache_clean, &src->flags))
+	if (!test_and_set_bit(PG_dcache_clean, &src->flags.f))
 		__flush_dcache_folio(folio_flush_mapping(src), src);
 
 	raw_spin_lock(&minicache_lock);
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 88c2d68a69c9..08641a936394 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -718,7 +718,7 @@ static void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
 			if (size < sz)
 				break;
 			if (!offset)
-				set_bit(PG_dcache_clean, &folio->flags);
+				set_bit(PG_dcache_clean, &folio->flags.f);
 			offset = 0;
 			size -= sz;
 			if (!size)
diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c
index 39fd5df73317..91e488767783 100644
--- a/arch/arm/mm/fault-armv.c
+++ b/arch/arm/mm/fault-armv.c
@@ -203,7 +203,7 @@ void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
 
 	folio = page_folio(pfn_to_page(pfn));
 	mapping = folio_flush_mapping(folio);
-	if (!test_and_set_bit(PG_dcache_clean, &folio->flags))
+	if (!test_and_set_bit(PG_dcache_clean, &folio->flags.f))
 		__flush_dcache_folio(mapping, folio);
 	if (mapping) {
 		if (cache_is_vivt())
diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c
index 5219158d54cf..19470d938b23 100644
--- a/arch/arm/mm/flush.c
+++ b/arch/arm/mm/flush.c
@@ -304,7 +304,7 @@ void __sync_icache_dcache(pte_t pteval)
 	else
 		mapping = NULL;
 
-	if (!test_and_set_bit(PG_dcache_clean, &folio->flags))
+	if (!test_and_set_bit(PG_dcache_clean, &folio->flags.f))
 		__flush_dcache_folio(mapping, folio);
 
 	if (pte_exec(pteval))
@@ -343,8 +343,8 @@ void flush_dcache_folio(struct folio *folio)
 		return;
 
 	if (!cache_ops_need_broadcast() && cache_is_vipt_nonaliasing()) {
-		if (test_bit(PG_dcache_clean, &folio->flags))
-			clear_bit(PG_dcache_clean, &folio->flags);
+		if (test_bit(PG_dcache_clean, &folio->flags.f))
+			clear_bit(PG_dcache_clean, &folio->flags.f);
 		return;
 	}
 
@@ -352,14 +352,14 @@ void flush_dcache_folio(struct folio *folio)
 
 	if (!cache_ops_need_broadcast() &&
 	    mapping && !folio_mapped(folio))
-		clear_bit(PG_dcache_clean, &folio->flags);
+		clear_bit(PG_dcache_clean, &folio->flags.f);
 	else {
 		__flush_dcache_folio(mapping, folio);
 		if (mapping && cache_is_vivt())
 			__flush_dcache_aliases(mapping, folio);
 		else if (mapping)
 			__flush_icache_all();
-		set_bit(PG_dcache_clean, &folio->flags);
+		set_bit(PG_dcache_clean, &folio->flags.f);
 	}
 }
 EXPORT_SYMBOL(flush_dcache_folio);
diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index 2a8155c4a882..44c1f757bfcf 100644
--- a/arch/arm64/include/asm/hugetlb.h
+++ b/arch/arm64/include/asm/hugetlb.h
@@ -21,12 +21,12 @@ extern bool arch_hugetlb_migration_supported(struct hstate *h);
 
 static inline void arch_clear_hugetlb_flags(struct folio *folio)
 {
-	clear_bit(PG_dcache_clean, &folio->flags);
+	clear_bit(PG_dcache_clean, &folio->flags.f);
 
 #ifdef CONFIG_ARM64_MTE
 	if (system_supports_mte()) {
-		clear_bit(PG_mte_tagged, &folio->flags);
-		clear_bit(PG_mte_lock, &folio->flags);
+		clear_bit(PG_mte_tagged, &folio->flags.f);
+		clear_bit(PG_mte_lock, &folio->flags.f);
 	}
 #endif
 }
diff --git a/arch/arm64/include/asm/mte.h b/arch/arm64/include/asm/mte.h
index 6567df8ec8ca..3b5069f4683d 100644
--- a/arch/arm64/include/asm/mte.h
+++ b/arch/arm64/include/asm/mte.h
@@ -48,12 +48,12 @@ static inline void set_page_mte_tagged(struct page *page)
 	 * before the page flags update.
 	 */
 	smp_wmb();
-	set_bit(PG_mte_tagged, &page->flags);
+	set_bit(PG_mte_tagged, &page->flags.f);
 }
 
 static inline bool page_mte_tagged(struct page *page)
 {
-	bool ret = test_bit(PG_mte_tagged, &page->flags);
+	bool ret = test_bit(PG_mte_tagged, &page->flags.f);
 
 	VM_WARN_ON_ONCE(folio_test_hugetlb(page_folio(page)));
 
@@ -82,7 +82,7 @@ static inline bool try_page_mte_tagging(struct page *page)
 {
 	VM_WARN_ON_ONCE(folio_test_hugetlb(page_folio(page)));
 
-	if (!test_and_set_bit(PG_mte_lock, &page->flags))
+	if (!test_and_set_bit(PG_mte_lock, &page->flags.f))
 		return true;
 
 	/*
@@ -90,7 +90,7 @@ static inline bool try_page_mte_tagging(struct page *page)
 	 * already. Check if the PG_mte_tagged flag has been set or wait
 	 * otherwise.
 	 */
-	smp_cond_load_acquire(&page->flags, VAL & (1UL << PG_mte_tagged));
+	smp_cond_load_acquire(&page->flags.f, VAL & (1UL << PG_mte_tagged));
 
 	return false;
 }
@@ -173,13 +173,13 @@ static inline void folio_set_hugetlb_mte_tagged(struct folio *folio)
 	 * before the folio flags update.
 	 */
 	smp_wmb();
-	set_bit(PG_mte_tagged, &folio->flags);
+	set_bit(PG_mte_tagged, &folio->flags.f);
 
 }
 
 static inline bool folio_test_hugetlb_mte_tagged(struct folio *folio)
 {
-	bool ret = test_bit(PG_mte_tagged, &folio->flags);
+	bool ret = test_bit(PG_mte_tagged, &folio->flags.f);
 
 	VM_WARN_ON_ONCE(!folio_test_hugetlb(folio));
 
@@ -196,7 +196,7 @@ static inline bool folio_try_hugetlb_mte_tagging(struct folio *folio)
 {
 	VM_WARN_ON_ONCE(!folio_test_hugetlb(folio));
 
-	if (!test_and_set_bit(PG_mte_lock, &folio->flags))
+	if (!test_and_set_bit(PG_mte_lock, &folio->flags.f))
 		return true;
 
 	/*
@@ -204,7 +204,7 @@ static inline bool folio_try_hugetlb_mte_tagging(struct folio *folio)
 	 * already. Check if the PG_mte_tagged flag has been set or wait
 	 * otherwise.
 	 */
-	smp_cond_load_acquire(&folio->flags, VAL & (1UL << PG_mte_tagged));
+	smp_cond_load_acquire(&folio->flags.f, VAL & (1UL << PG_mte_tagged));
 
 	return false;
 }
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
index 013eead9b695..fbf08b543c3f 100644
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -53,11 +53,11 @@ void __sync_icache_dcache(pte_t pte)
 {
 	struct folio *folio = page_folio(pte_page(pte));
 
-	if (!test_bit(PG_dcache_clean, &folio->flags)) {
+	if (!test_bit(PG_dcache_clean, &folio->flags.f)) {
 		sync_icache_aliases((unsigned long)folio_address(folio),
 				    (unsigned long)folio_address(folio) +
 					    folio_size(folio));
-		set_bit(PG_dcache_clean, &folio->flags);
+		set_bit(PG_dcache_clean, &folio->flags.f);
 	}
 }
 EXPORT_SYMBOL_GPL(__sync_icache_dcache);
@@ -69,8 +69,8 @@ EXPORT_SYMBOL_GPL(__sync_icache_dcache);
  */
 void flush_dcache_folio(struct folio *folio)
 {
-	if (test_bit(PG_dcache_clean, &folio->flags))
-		clear_bit(PG_dcache_clean, &folio->flags);
+	if (test_bit(PG_dcache_clean, &folio->flags.f))
+		clear_bit(PG_dcache_clean, &folio->flags.f);
 }
 EXPORT_SYMBOL(flush_dcache_folio);
 
diff --git a/arch/csky/abiv1/cacheflush.c b/arch/csky/abiv1/cacheflush.c
index 171e8fb32285..4bc0aad3cf8a 100644
--- a/arch/csky/abiv1/cacheflush.c
+++ b/arch/csky/abiv1/cacheflush.c
@@ -25,12 +25,12 @@ void flush_dcache_folio(struct folio *folio)
 	mapping = folio_flush_mapping(folio);
 
 	if (mapping && !folio_mapped(folio))
-		clear_bit(PG_dcache_clean, &folio->flags);
+		clear_bit(PG_dcache_clean, &folio->flags.f);
 	else {
 		dcache_wbinv_all();
 		if (mapping)
 			icache_inv_all();
-		set_bit(PG_dcache_clean, &folio->flags);
+		set_bit(PG_dcache_clean, &folio->flags.f);
 	}
 }
 EXPORT_SYMBOL(flush_dcache_folio);
@@ -56,7 +56,7 @@ void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
 		return;
 
 	folio = page_folio(pfn_to_page(pfn));
-	if (!test_and_set_bit(PG_dcache_clean, &folio->flags))
+	if (!test_and_set_bit(PG_dcache_clean, &folio->flags.f))
 		dcache_wbinv_all();
 
 	if (folio_flush_mapping(folio)) {
diff --git a/arch/mips/include/asm/cacheflush.h b/arch/mips/include/asm/cacheflush.h
index 1f14132b3fc9..5d283ef89d90 100644
--- a/arch/mips/include/asm/cacheflush.h
+++ b/arch/mips/include/asm/cacheflush.h
@@ -37,11 +37,11 @@
 #define PG_dcache_dirty			PG_arch_1
 
 #define folio_test_dcache_dirty(folio)		\
-	test_bit(PG_dcache_dirty, &(folio)->flags)
+	test_bit(PG_dcache_dirty, &(folio)->flags.f)
 #define folio_set_dcache_dirty(folio)	\
-	set_bit(PG_dcache_dirty, &(folio)->flags)
+	set_bit(PG_dcache_dirty, &(folio)->flags.f)
 #define folio_clear_dcache_dirty(folio)	\
-	clear_bit(PG_dcache_dirty, &(folio)->flags)
+	clear_bit(PG_dcache_dirty, &(folio)->flags.f)
 
 extern void (*flush_cache_all)(void);
 extern void (*__flush_cache_all)(void);
diff --git a/arch/nios2/mm/cacheflush.c b/arch/nios2/mm/cacheflush.c
index 0ee9c5f02e08..8321182eb927 100644
--- a/arch/nios2/mm/cacheflush.c
+++ b/arch/nios2/mm/cacheflush.c
@@ -187,7 +187,7 @@ void flush_dcache_folio(struct folio *folio)
 
 	/* Flush this page if there are aliases. */
 	if (mapping && !mapping_mapped(mapping)) {
-		clear_bit(PG_dcache_clean, &folio->flags);
+		clear_bit(PG_dcache_clean, &folio->flags.f);
 	} else {
 		__flush_dcache_folio(folio);
 		if (mapping) {
@@ -195,7 +195,7 @@ void flush_dcache_folio(struct folio *folio)
 			flush_aliases(mapping, folio);
 			flush_icache_range(start, start + folio_size(folio));
 		}
-		set_bit(PG_dcache_clean, &folio->flags);
+		set_bit(PG_dcache_clean, &folio->flags.f);
 	}
 }
 EXPORT_SYMBOL(flush_dcache_folio);
@@ -227,7 +227,7 @@ void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
 		return;
 
 	folio = page_folio(pfn_to_page(pfn));
-	if (!test_and_set_bit(PG_dcache_clean, &folio->flags))
+	if (!test_and_set_bit(PG_dcache_clean, &folio->flags.f))
 		__flush_dcache_folio(folio);
 
 	mapping = folio_flush_mapping(folio);
diff --git a/arch/openrisc/include/asm/cacheflush.h b/arch/openrisc/include/asm/cacheflush.h
index 0e60af486ec1..cd8f971c0fec 100644
--- a/arch/openrisc/include/asm/cacheflush.h
+++ b/arch/openrisc/include/asm/cacheflush.h
@@ -75,7 +75,7 @@ static inline void sync_icache_dcache(struct page *page)
 
 static inline void flush_dcache_folio(struct folio *folio)
 {
-	clear_bit(PG_dc_clean, &folio->flags);
+	clear_bit(PG_dc_clean, &folio->flags.f);
 }
 #define flush_dcache_folio flush_dcache_folio
 
diff --git a/arch/openrisc/mm/cache.c b/arch/openrisc/mm/cache.c
index 0f265b8e73ec..f33df46dae4e 100644
--- a/arch/openrisc/mm/cache.c
+++ b/arch/openrisc/mm/cache.c
@@ -83,7 +83,7 @@ void update_cache(struct vm_area_struct *vma, unsigned long address,
 {
 	unsigned long pfn = pte_val(*pte) >> PAGE_SHIFT;
 	struct folio *folio = page_folio(pfn_to_page(pfn));
-	int dirty = !test_and_set_bit(PG_dc_clean, &folio->flags);
+	int dirty = !test_and_set_bit(PG_dc_clean, &folio->flags.f);
 
 	/*
 	 * Since icaches do not snoop for updated data on OpenRISC, we
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 37ca484cc495..4c5240d3a3c7 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -122,10 +122,10 @@ void __update_cache(pte_t pte)
 	pfn = folio_pfn(folio);
 	nr = folio_nr_pages(folio);
 	if (folio_flush_mapping(folio) &&
-	    test_bit(PG_dcache_dirty, &folio->flags)) {
+	    test_bit(PG_dcache_dirty, &folio->flags.f)) {
 		while (nr--)
 			flush_kernel_dcache_page_addr(pfn_va(pfn + nr));
-		clear_bit(PG_dcache_dirty, &folio->flags);
+		clear_bit(PG_dcache_dirty, &folio->flags.f);
 	} else if (parisc_requires_coherency())
 		while (nr--)
 			flush_kernel_dcache_page_addr(pfn_va(pfn + nr));
@@ -481,7 +481,7 @@ void flush_dcache_folio(struct folio *folio)
 	pgoff_t pgoff;
 
 	if (mapping && !mapping_mapped(mapping)) {
-		set_bit(PG_dcache_dirty, &folio->flags);
+		set_bit(PG_dcache_dirty, &folio->flags.f);
 		return;
 	}
 
diff --git a/arch/powerpc/include/asm/cacheflush.h b/arch/powerpc/include/asm/cacheflush.h
index f2656774aaa9..1fea42928f64 100644
--- a/arch/powerpc/include/asm/cacheflush.h
+++ b/arch/powerpc/include/asm/cacheflush.h
@@ -40,8 +40,8 @@ static inline void flush_dcache_folio(struct folio *folio)
 	if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
 		return;
 	/* avoid an atomic op if possible */
-	if (test_bit(PG_dcache_clean, &folio->flags))
-		clear_bit(PG_dcache_clean, &folio->flags);
+	if (test_bit(PG_dcache_clean, &folio->flags.f))
+		clear_bit(PG_dcache_clean, &folio->flags.f);
 }
 #define flush_dcache_folio flush_dcache_folio
 
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index ca3829d47ab7..0953f2daa466 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -939,9 +939,9 @@ static inline void kvmppc_mmu_flush_icache(kvm_pfn_t pfn)
 
 	/* Clear i-cache for new pages */
 	folio = page_folio(pfn_to_page(pfn));
-	if (!test_bit(PG_dcache_clean, &folio->flags)) {
+	if (!test_bit(PG_dcache_clean, &folio->flags.f)) {
 		flush_dcache_icache_folio(folio);
-		set_bit(PG_dcache_clean, &folio->flags);
+		set_bit(PG_dcache_clean, &folio->flags.f);
 	}
 }
 
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index 4693c464fc5a..3aee3af614af 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -1562,11 +1562,11 @@ unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap)
 	folio = page_folio(pte_page(pte));
 
 	/* page is dirty */
-	if (!test_bit(PG_dcache_clean, &folio->flags) &&
+	if (!test_bit(PG_dcache_clean, &folio->flags.f) &&
 	    !folio_test_reserved(folio)) {
 		if (trap == INTERRUPT_INST_STORAGE) {
 			flush_dcache_icache_folio(folio);
-			set_bit(PG_dcache_clean, &folio->flags);
+			set_bit(PG_dcache_clean, &folio->flags.f);
 		} else
 			pp |= HPTE_R_N;
 	}
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index dfaa9fd86f7e..56d7e8960e77 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -87,9 +87,9 @@ static pte_t set_pte_filter_hash(pte_t pte, unsigned long addr)
 		struct folio *folio = maybe_pte_to_folio(pte);
 		if (!folio)
 			return pte;
-		if (!test_bit(PG_dcache_clean, &folio->flags)) {
+		if (!test_bit(PG_dcache_clean, &folio->flags.f)) {
 			flush_dcache_icache_folio(folio);
-			set_bit(PG_dcache_clean, &folio->flags);
+			set_bit(PG_dcache_clean, &folio->flags.f);
 		}
 	}
 	return pte;
@@ -127,13 +127,13 @@ static inline pte_t set_pte_filter(pte_t pte, unsigned long addr)
 		return pte;
 
 	/* If the page clean, we move on */
-	if (test_bit(PG_dcache_clean, &folio->flags))
+	if (test_bit(PG_dcache_clean, &folio->flags.f))
 		return pte;
 
 	/* If it's an exec fault, we flush the cache and make it clean */
 	if (is_exec_fault()) {
 		flush_dcache_icache_folio(folio);
-		set_bit(PG_dcache_clean, &folio->flags);
+		set_bit(PG_dcache_clean, &folio->flags.f);
 		return pte;
 	}
 
@@ -175,12 +175,12 @@ static pte_t set_access_flags_filter(pte_t pte, struct vm_area_struct *vma,
 		goto bail;
 
 	/* If the page is already clean, we move on */
-	if (test_bit(PG_dcache_clean, &folio->flags))
+	if (test_bit(PG_dcache_clean, &folio->flags.f))
 		goto bail;
 
 	/* Clean the page and set PG_dcache_clean */
 	flush_dcache_icache_folio(folio);
-	set_bit(PG_dcache_clean, &folio->flags);
+	set_bit(PG_dcache_clean, &folio->flags.f);
 
  bail:
 	return pte_mkexec(pte);
diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h
index 6086b38d5427..0092513c3376 100644
--- a/arch/riscv/include/asm/cacheflush.h
+++ b/arch/riscv/include/asm/cacheflush.h
@@ -23,8 +23,8 @@ static inline void local_flush_icache_range(unsigned long start,
 
 static inline void flush_dcache_folio(struct folio *folio)
 {
-	if (test_bit(PG_dcache_clean, &folio->flags))
-		clear_bit(PG_dcache_clean, &folio->flags);
+	if (test_bit(PG_dcache_clean, &folio->flags.f))
+		clear_bit(PG_dcache_clean, &folio->flags.f);
 }
 #define flush_dcache_folio flush_dcache_folio
 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h
index 446126497768..0872d43fc0c0 100644
--- a/arch/riscv/include/asm/hugetlb.h
+++ b/arch/riscv/include/asm/hugetlb.h
@@ -7,7 +7,7 @@
 
 static inline void arch_clear_hugetlb_flags(struct folio *folio)
 {
-	clear_bit(PG_dcache_clean, &folio->flags);
+	clear_bit(PG_dcache_clean, &folio->flags.f);
 }
 #define arch_clear_hugetlb_flags arch_clear_hugetlb_flags
 
diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c
index 4ca5aafce22e..d83a612464f6 100644
--- a/arch/riscv/mm/cacheflush.c
+++ b/arch/riscv/mm/cacheflush.c
@@ -101,9 +101,9 @@ void flush_icache_pte(struct mm_struct *mm, pte_t pte)
 {
 	struct folio *folio = page_folio(pte_page(pte));
 
-	if (!test_bit(PG_dcache_clean, &folio->flags)) {
+	if (!test_bit(PG_dcache_clean, &folio->flags.f)) {
 		flush_icache_mm(mm, false);
-		set_bit(PG_dcache_clean, &folio->flags);
+		set_bit(PG_dcache_clean, &folio->flags.f);
 	}
 }
 #endif /* CONFIG_MMU */
diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h
index 931fcc413598..69131736daaa 100644
--- a/arch/s390/include/asm/hugetlb.h
+++ b/arch/s390/include/asm/hugetlb.h
@@ -39,7 +39,7 @@ static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
 
 static inline void arch_clear_hugetlb_flags(struct folio *folio)
 {
-	clear_bit(PG_arch_1, &folio->flags);
+	clear_bit(PG_arch_1, &folio->flags.f);
 }
 #define arch_clear_hugetlb_flags arch_clear_hugetlb_flags
 
diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
index 47f574cd1728..93b2a01bae40 100644
--- a/arch/s390/kernel/uv.c
+++ b/arch/s390/kernel/uv.c
@@ -144,7 +144,7 @@ int uv_destroy_folio(struct folio *folio)
 	folio_get(folio);
 	rc = uv_destroy(folio_to_phys(folio));
 	if (!rc)
-		clear_bit(PG_arch_1, &folio->flags);
+		clear_bit(PG_arch_1, &folio->flags.f);
 	folio_put(folio);
 	return rc;
 }
@@ -193,7 +193,7 @@ int uv_convert_from_secure_folio(struct folio *folio)
 	folio_get(folio);
 	rc = uv_convert_from_secure(folio_to_phys(folio));
 	if (!rc)
-		clear_bit(PG_arch_1, &folio->flags);
+		clear_bit(PG_arch_1, &folio->flags.f);
 	folio_put(folio);
 	return rc;
 }
@@ -289,7 +289,7 @@ static int __make_folio_secure(struct folio *folio, struct uv_cb_header *uvcb)
 	expected = expected_folio_refs(folio) + 1;
 	if (!folio_ref_freeze(folio, expected))
 		return -EBUSY;
-	set_bit(PG_arch_1, &folio->flags);
+	set_bit(PG_arch_1, &folio->flags.f);
 	/*
 	 * If the UVC does not succeed or fail immediately, we don't want to
 	 * loop for long, or we might get stall notifications.
@@ -483,18 +483,18 @@ int arch_make_folio_accessible(struct folio *folio)
 	 *    convert_to_secure.
 	 * As secure pages are never large folios, both variants can co-exists.
 	 */
-	if (!test_bit(PG_arch_1, &folio->flags))
+	if (!test_bit(PG_arch_1, &folio->flags.f))
 		return 0;
 
 	rc = uv_pin_shared(folio_to_phys(folio));
 	if (!rc) {
-		clear_bit(PG_arch_1, &folio->flags);
+		clear_bit(PG_arch_1, &folio->flags.f);
 		return 0;
 	}
 
 	rc = uv_convert_from_secure(folio_to_phys(folio));
 	if (!rc) {
-		clear_bit(PG_arch_1, &folio->flags);
+		clear_bit(PG_arch_1, &folio->flags.f);
 		return 0;
 	}
 
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index c7defe4ed1f6..8ff6bba107e8 100644
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -2272,7 +2272,7 @@ static int __s390_enable_skey_hugetlb(pte_t *pte, unsigned long addr,
 	start = pmd_val(*pmd) & HPAGE_MASK;
 	end = start + HPAGE_SIZE;
 	__storage_key_init_range(start, end);
-	set_bit(PG_arch_1, &folio->flags);
+	set_bit(PG_arch_1, &folio->flags.f);
 	cond_resched();
 	return 0;
 }
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index e88c02c9e642..72e8fa136af5 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -155,7 +155,7 @@ static void clear_huge_pte_skeys(struct mm_struct *mm, unsigned long rste)
 		paddr = rste & PMD_MASK;
 	}
 
-	if (!test_and_set_bit(PG_arch_1, &folio->flags))
+	if (!test_and_set_bit(PG_arch_1, &folio->flags.f))
 		__storage_key_init_range(paddr, paddr + size);
 }
 
diff --git a/arch/sh/include/asm/hugetlb.h b/arch/sh/include/asm/hugetlb.h
index 4a92e6e4d627..974512f359f0 100644
--- a/arch/sh/include/asm/hugetlb.h
+++ b/arch/sh/include/asm/hugetlb.h
@@ -14,7 +14,7 @@ static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
 
 static inline void arch_clear_hugetlb_flags(struct folio *folio)
 {
-	clear_bit(PG_dcache_clean, &folio->flags);
+	clear_bit(PG_dcache_clean, &folio->flags.f);
 }
 #define arch_clear_hugetlb_flags arch_clear_hugetlb_flags
 
diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
index 46393b00137e..83fb34b39ca7 100644
--- a/arch/sh/mm/cache-sh4.c
+++ b/arch/sh/mm/cache-sh4.c
@@ -114,7 +114,7 @@ static void sh4_flush_dcache_folio(void *arg)
 	struct address_space *mapping = folio_flush_mapping(folio);
 
 	if (mapping && !mapping_mapped(mapping))
-		clear_bit(PG_dcache_clean, &folio->flags);
+		clear_bit(PG_dcache_clean, &folio->flags.f);
 	else
 #endif
 	{
diff --git a/arch/sh/mm/cache-sh7705.c b/arch/sh/mm/cache-sh7705.c
index b509a407588f..71f8be9fc8e0 100644
--- a/arch/sh/mm/cache-sh7705.c
+++ b/arch/sh/mm/cache-sh7705.c
@@ -138,7 +138,7 @@ static void sh7705_flush_dcache_folio(void *arg)
 	struct address_space *mapping = folio_flush_mapping(folio);
 
 	if (mapping && !mapping_mapped(mapping))
-		clear_bit(PG_dcache_clean, &folio->flags);
+		clear_bit(PG_dcache_clean, &folio->flags.f);
 	else {
 		unsigned long pfn = folio_pfn(folio);
 		unsigned int i, nr = folio_nr_pages(folio);
diff --git a/arch/sh/mm/cache.c b/arch/sh/mm/cache.c
index 6ebdeaff3021..c3f028bed049 100644
--- a/arch/sh/mm/cache.c
+++ b/arch/sh/mm/cache.c
@@ -64,14 +64,14 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
 	struct folio *folio = page_folio(page);
 
 	if (boot_cpu_data.dcache.n_aliases && folio_mapped(folio) &&
-	    test_bit(PG_dcache_clean, &folio->flags)) {
+	    test_bit(PG_dcache_clean, &folio->flags.f)) {
 		void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
 		memcpy(vto, src, len);
 		kunmap_coherent(vto);
 	} else {
 		memcpy(dst, src, len);
 		if (boot_cpu_data.dcache.n_aliases)
-			clear_bit(PG_dcache_clean, &folio->flags);
+			clear_bit(PG_dcache_clean, &folio->flags.f);
 	}
 
 	if (vma->vm_flags & VM_EXEC)
@@ -85,14 +85,14 @@ void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
 	struct folio *folio = page_folio(page);
 
 	if (boot_cpu_data.dcache.n_aliases && folio_mapped(folio) &&
-	    test_bit(PG_dcache_clean, &folio->flags)) {
+	    test_bit(PG_dcache_clean, &folio->flags.f)) {
 		void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
 		memcpy(dst, vfrom, len);
 		kunmap_coherent(vfrom);
 	} else {
 		memcpy(dst, src, len);
 		if (boot_cpu_data.dcache.n_aliases)
-			clear_bit(PG_dcache_clean, &folio->flags);
+			clear_bit(PG_dcache_clean, &folio->flags.f);
 	}
 }
 
@@ -105,7 +105,7 @@ void copy_user_highpage(struct page *to, struct page *from,
 	vto = kmap_atomic(to);
 
 	if (boot_cpu_data.dcache.n_aliases && folio_mapped(src) &&
-	    test_bit(PG_dcache_clean, &src->flags)) {
+	    test_bit(PG_dcache_clean, &src->flags.f)) {
 		vfrom = kmap_coherent(from, vaddr);
 		copy_page(vto, vfrom);
 		kunmap_coherent(vfrom);
@@ -148,7 +148,7 @@ void __update_cache(struct vm_area_struct *vma,
 
 	if (pfn_valid(pfn)) {
 		struct folio *folio = page_folio(pfn_to_page(pfn));
-		int dirty = !test_and_set_bit(PG_dcache_clean, &folio->flags);
+		int dirty = !test_and_set_bit(PG_dcache_clean, &folio->flags.f);
 		if (dirty)
 			__flush_purge_region(folio_address(folio),
 						folio_size(folio));
@@ -162,7 +162,7 @@ void __flush_anon_page(struct page *page, unsigned long vmaddr)
 
 	if (pages_do_alias(addr, vmaddr)) {
 		if (boot_cpu_data.dcache.n_aliases && folio_mapped(folio) &&
-		    test_bit(PG_dcache_clean, &folio->flags)) {
+		    test_bit(PG_dcache_clean, &folio->flags.f)) {
 			void *kaddr;
 
 			kaddr = kmap_coherent(page, vmaddr);
diff --git a/arch/sh/mm/kmap.c b/arch/sh/mm/kmap.c
index fa50e8f6e7a9..c9f32d5a54b8 100644
--- a/arch/sh/mm/kmap.c
+++ b/arch/sh/mm/kmap.c
@@ -31,7 +31,7 @@ void *kmap_coherent(struct page *page, unsigned long addr)
 	enum fixed_addresses idx;
 	unsigned long vaddr;
 
-	BUG_ON(!test_bit(PG_dcache_clean, &folio->flags));
+	BUG_ON(!test_bit(PG_dcache_clean, &folio->flags.f));
 
 	preempt_disable();
 	pagefault_disable();
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 7ed58bf3aaca..df9f7c444c39 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -224,7 +224,7 @@ inline void flush_dcache_folio_impl(struct folio *folio)
 	((1UL<<ilog2(roundup_pow_of_two(NR_CPUS)))-1UL)
 
 #define dcache_dirty_cpu(folio) \
-	(((folio)->flags >> PG_dcache_cpu_shift) & PG_dcache_cpu_mask)
+	(((folio)->flags.f >> PG_dcache_cpu_shift) & PG_dcache_cpu_mask)
 
 static inline void set_dcache_dirty(struct folio *folio, int this_cpu)
 {
@@ -243,7 +243,7 @@ static inline void set_dcache_dirty(struct folio *folio, int this_cpu)
 			     "bne,pn	%%xcc, 1b\n\t"
 			     " nop"
 			     : /* no outputs */
-			     : "r" (mask), "r" (non_cpu_bits), "r" (&folio->flags)
+			     : "r" (mask), "r" (non_cpu_bits), "r" (&folio->flags.f)
 			     : "g1", "g7");
 }
 
@@ -265,7 +265,7 @@ static inline void clear_dcache_dirty_cpu(struct folio *folio, unsigned long cpu
 			     " nop\n"
 			     "2:"
 			     : /* no outputs */
-			     : "r" (cpu), "r" (mask), "r" (&folio->flags),
+			     : "r" (cpu), "r" (mask), "r" (&folio->flags.f),
 			       "i" (PG_dcache_cpu_mask),
 			       "i" (PG_dcache_cpu_shift)
 			     : "g1", "g7");
@@ -292,7 +292,7 @@ static void flush_dcache(unsigned long pfn)
 		struct folio *folio = page_folio(page);
 		unsigned long pg_flags;
 
-		pg_flags = folio->flags;
+		pg_flags = folio->flags.f;
 		if (pg_flags & (1UL << PG_dcache_dirty)) {
 			int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
 				   PG_dcache_cpu_mask);
@@ -480,7 +480,7 @@ void flush_dcache_folio(struct folio *folio)
 
 	mapping = folio_flush_mapping(folio);
 	if (mapping && !mapping_mapped(mapping)) {
-		bool dirty = test_bit(PG_dcache_dirty, &folio->flags);
+		bool dirty = test_bit(PG_dcache_dirty, &folio->flags.f);
 		if (dirty) {
 			int dirty_cpu = dcache_dirty_cpu(folio);
 
diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index c09284302dd3..b68200a0e0c6 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -126,7 +126,7 @@ __setup("debugpat", pat_debug_setup);
 
 static inline enum page_cache_mode get_page_memtype(struct page *pg)
 {
-	unsigned long pg_flags = pg->flags & _PGMT_MASK;
+	unsigned long pg_flags = pg->flags.f & _PGMT_MASK;
 
 	if (pg_flags == _PGMT_WB)
 		return _PAGE_CACHE_MODE_WB;
@@ -161,10 +161,10 @@ static inline void set_page_memtype(struct page *pg,
 		break;
 	}
 
-	old_flags = READ_ONCE(pg->flags);
+	old_flags = READ_ONCE(pg->flags.f);
 	do {
 		new_flags = (old_flags & _PGMT_CLEAR_MASK) | memtype_flags;
-	} while (!try_cmpxchg(&pg->flags, &old_flags, new_flags));
+	} while (!try_cmpxchg(&pg->flags.f, &old_flags, new_flags));
 }
 #else
 static inline enum page_cache_mode get_page_memtype(struct page *pg)
diff --git a/arch/xtensa/mm/cache.c b/arch/xtensa/mm/cache.c
index 23be0e7516ce..5354df52d61f 100644
--- a/arch/xtensa/mm/cache.c
+++ b/arch/xtensa/mm/cache.c
@@ -134,8 +134,8 @@ void flush_dcache_folio(struct folio *folio)
 	 */
 
 	if (mapping && !mapping_mapped(mapping)) {
-		if (!test_bit(PG_arch_1, &folio->flags))
-			set_bit(PG_arch_1, &folio->flags);
+		if (!test_bit(PG_arch_1, &folio->flags.f))
+			set_bit(PG_arch_1, &folio->flags.f);
 		return;
 
 	} else {
@@ -232,7 +232,7 @@ void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
 
 #if (DCACHE_WAY_SIZE > PAGE_SIZE)
 
-	if (!folio_test_reserved(folio) && test_bit(PG_arch_1, &folio->flags)) {
+	if (!folio_test_reserved(folio) && test_bit(PG_arch_1, &folio->flags.f)) {
 		unsigned long phys = folio_pfn(folio) * PAGE_SIZE;
 		unsigned long tmp;
 
@@ -247,10 +247,10 @@ void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
 		}
 		preempt_enable();
 
-		clear_bit(PG_arch_1, &folio->flags);
+		clear_bit(PG_arch_1, &folio->flags.f);
 	}
 #else
-	if (!folio_test_reserved(folio) && !test_bit(PG_arch_1, &folio->flags)
+	if (!folio_test_reserved(folio) && !test_bit(PG_arch_1, &folio->flags.f)
 	    && (vma->vm_flags & VM_EXEC) != 0) {
 		for (i = 0; i < nr; i++) {
 			void *paddr = kmap_local_folio(folio, i * PAGE_SIZE);
@@ -258,7 +258,7 @@ void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
 			__invalidate_icache_page((unsigned long)paddr);
 			kunmap_local(paddr);
 		}
-		set_bit(PG_arch_1, &folio->flags);
+		set_bit(PG_arch_1, &folio->flags.f);
 	}
 #endif
 }