linux-kernel - [PATCH RFC 20/35] mips: mm: convert __flush_dcache_pages() to __flush_dcache_folio

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Message-ID: <20250821200701.1329277-21-david@redhat.com>
Date: Thu, 21 Aug 2025 22:06:46 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: David Hildenbrand <david@...hat.com>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Alexander Potapenko <glider@...gle.com>,
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	Zi Yan <ziy@...dia.com>
Subject: [PATCH RFC 20/35] mips: mm: convert __flush_dcache_pages() to __flush_dcache_folio_pages()

Let's make it clearer that we are operating within a single folio by
providing both the folio and the page.

This implies that for flush_dcache_folio() we'll now avoid one more
page->folio lookup, and that we can safely drop the "nth_page" usage.

Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 arch/mips/include/asm/cacheflush.h | 11 +++++++----
 arch/mips/mm/cache.c               |  8 ++++----
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/arch/mips/include/asm/cacheflush.h b/arch/mips/include/asm/cacheflush.h
index 1f14132b3fc98..8a2de28936e07 100644
--- a/arch/mips/include/asm/cacheflush.h
+++ b/arch/mips/include/asm/cacheflush.h
@@ -50,13 +50,14 @@ extern void (*flush_cache_mm)(struct mm_struct *mm);
 extern void (*flush_cache_range)(struct vm_area_struct *vma,
 	unsigned long start, unsigned long end);
 extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
-extern void __flush_dcache_pages(struct page *page, unsigned int nr);
+extern void __flush_dcache_folio_pages(struct folio *folio, struct page *page, unsigned int nr);
 
 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
 static inline void flush_dcache_folio(struct folio *folio)
 {
 	if (cpu_has_dc_aliases)
-		__flush_dcache_pages(&folio->page, folio_nr_pages(folio));
+		__flush_dcache_folio_pages(folio, folio_page(folio, 0),
+					   folio_nr_pages(folio));
 	else if (!cpu_has_ic_fills_f_dc)
 		folio_set_dcache_dirty(folio);
 }
@@ -64,10 +65,12 @@ static inline void flush_dcache_folio(struct folio *folio)
 
 static inline void flush_dcache_page(struct page *page)
 {
+	struct folio *folio = page_folio(page);
+
 	if (cpu_has_dc_aliases)
-		__flush_dcache_pages(page, 1);
+		__flush_dcache_folio_pages(folio, page, folio_nr_pages(folio));
 	else if (!cpu_has_ic_fills_f_dc)
-		folio_set_dcache_dirty(page_folio(page));
+		folio_set_dcache_dirty(folio);
 }
 
 #define flush_dcache_mmap_lock(mapping)		do { } while (0)
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index bf9a37c60e9f0..e3b4224c9a406 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -99,9 +99,9 @@ SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
 	return 0;
 }
 
-void __flush_dcache_pages(struct page *page, unsigned int nr)
+void __flush_dcache_folio_pages(struct folio *folio, struct page *page,
+		unsigned int nr)
 {
-	struct folio *folio = page_folio(page);
 	struct address_space *mapping = folio_flush_mapping(folio);
 	unsigned long addr;
 	unsigned int i;
@@ -117,12 +117,12 @@ void __flush_dcache_pages(struct page *page, unsigned int nr)
 	 * get faulted into the tlb (and thus flushed) anyways.
 	 */
 	for (i = 0; i < nr; i++) {
-		addr = (unsigned long)kmap_local_page(nth_page(page, i));
+		addr = (unsigned long)kmap_local_page(page + i);
 		flush_data_cache_page(addr);
 		kunmap_local((void *)addr);
 	}
 }
-EXPORT_SYMBOL(__flush_dcache_pages);
+EXPORT_SYMBOL(__flush_dcache_folio_pages);
 
 void __flush_anon_page(struct page *page, unsigned long vmaddr)
 {
-- 
2.50.1