linux-riscv · linux-riscv-bot · Aug 21, 2025 · Aug 21, 2025 · Aug 21, 2025 · Aug 21, 2025
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
@@ -1570,7 +1570,6 @@ source "kernel/Kconfig.hz"
 config ARCH_SPARSEMEM_ENABLE
 	def_bool y
 	select SPARSEMEM_VMEMMAP_ENABLE
-	select SPARSEMEM_VMEMMAP
 
 config HW_PERF_EVENTS
 	def_bool y

diff --git a/arch/mips/include/asm/cacheflush.h b/arch/mips/include/asm/cacheflush.h
@@ -50,24 +50,27 @@ 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);
 }
 #define flush_dcache_folio flush_dcache_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
@@ -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)
 {

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
@@ -710,7 +710,6 @@ menu "Memory setup"
 config ARCH_SPARSEMEM_ENABLE
 	def_bool y
 	select SPARSEMEM_VMEMMAP_ENABLE
-	select SPARSEMEM_VMEMMAP
 
 config ARCH_SPARSEMEM_DEFAULT
 	def_bool y

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
@@ -1552,7 +1552,6 @@ config ARCH_SPARSEMEM_ENABLE
 	def_bool y
 	select SPARSEMEM_STATIC if X86_32
 	select SPARSEMEM_VMEMMAP_ENABLE if X86_64
-	select SPARSEMEM_VMEMMAP if X86_64
 
 config ARCH_SPARSEMEM_DEFAULT
 	def_bool X86_64 || (NUMA && X86_32)

diff --git a/crypto/ahash.c b/crypto/ahash.c
@@ -88,7 +88,7 @@ static int hash_walk_new_entry(struct crypto_hash_walk *walk)
 
 	sg = walk->sg;
 	walk->offset = sg->offset;
-	walk->pg = nth_page(sg_page(walk->sg), (walk->offset >> PAGE_SHIFT));
+	walk->pg = sg_page(walk->sg) + walk->offset / PAGE_SIZE;
 	walk->offset = offset_in_page(walk->offset);
 	walk->entrylen = sg->length;
 
@@ -226,7 +226,7 @@ int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
 	if (!IS_ENABLED(CONFIG_HIGHMEM))
 		return crypto_shash_digest(desc, data, nbytes, req->result);
 
-	page = nth_page(page, offset >> PAGE_SHIFT);
+	page += offset / PAGE_SIZE;
 	offset = offset_in_page(offset);
 
 	if (nbytes > (unsigned int)PAGE_SIZE - offset)

diff --git a/crypto/scompress.c b/crypto/scompress.c
@@ -198,7 +198,7 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
 		} else
 			return -ENOSYS;
 
-		dpage = nth_page(dpage, doff / PAGE_SIZE);
+		dpage += doff / PAGE_SIZE;
 		doff = offset_in_page(doff);
 
 		n = (dlen - 1) / PAGE_SIZE;
@@ -220,12 +220,12 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
 			} else
 				break;
 
-			spage = nth_page(spage, soff / PAGE_SIZE);
+			spage = spage + soff / PAGE_SIZE;
 			soff = offset_in_page(soff);
 
 			n = (slen - 1) / PAGE_SIZE;
 			n += (offset_in_page(slen - 1) + soff) / PAGE_SIZE;
-			if (PageHighMem(nth_page(spage, n)) &&
+			if (PageHighMem(spage + n) &&
 			    size_add(soff, slen) > PAGE_SIZE)
 				break;
 			src = kmap_local_page(spage) + soff;
@@ -270,7 +270,7 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
 			if (dlen <= PAGE_SIZE)
 				break;
 			dlen -= PAGE_SIZE;
-			dpage = nth_page(dpage, 1);
+			dpage++;
 		}
 	}
 

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
@@ -614,7 +614,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
 	offset = qc->cursg->offset + qc->cursg_ofs;
 
 	/* get the current page and offset */
-	page = nth_page(page, (offset >> PAGE_SHIFT));
+	page += offset / PAGE_SHIFT;
 	offset %= PAGE_SIZE;
 
 	/* don't overrun current sg */
@@ -631,7 +631,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
 		unsigned int split_len = PAGE_SIZE - offset;
 
 		ata_pio_xfer(qc, page, offset, split_len);
-		ata_pio_xfer(qc, nth_page(page, 1), 0, count - split_len);
+		ata_pio_xfer(qc, page + 1, 0, count - split_len);
 	} else {
 		ata_pio_xfer(qc, page, offset, count);
 	}
@@ -751,7 +751,7 @@ static int __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
 	offset = sg->offset + qc->cursg_ofs;
 
 	/* get the current page and offset */
-	page = nth_page(page, (offset >> PAGE_SHIFT));
+	page += offset / PAGE_SIZE;
 	offset %= PAGE_SIZE;
 
 	/* don't overrun current sg */

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -779,7 +779,7 @@ __i915_gem_object_get_page(struct drm_i915_gem_object *obj, pgoff_t n)
 	GEM_BUG_ON(!i915_gem_object_has_struct_page(obj));
 
 	sg = i915_gem_object_get_sg(obj, n, &offset);
-	return nth_page(sg_page(sg), offset);
+	return sg_page(sg) + offset;
 }
 
 /* Like i915_gem_object_get_page(), but mark the returned page dirty */

diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
@@ -560,8 +560,7 @@ static int h_mspro_block_transfer_data(struct memstick_dev *card,
 		t_offset += msb->current_page * msb->page_size;
 
 		sg_set_page(&t_sg,
-			    nth_page(sg_page(&(msb->req_sg[msb->current_seg])),
-				     t_offset >> PAGE_SHIFT),
+			    sg_page(&(msb->req_sg[msb->current_seg])) + t_offset / PAGE_SIZE,
 			    msb->page_size, offset_in_page(t_offset));
 
 		memstick_init_req_sg(*mrq, msb->data_dir == READ

diff --git a/drivers/memstick/host/jmb38x_ms.c b/drivers/memstick/host/jmb38x_ms.c
@@ -317,8 +317,7 @@ static int jmb38x_ms_transfer_data(struct jmb38x_ms_host *host)
 		unsigned int p_off;
 
 		if (host->req->long_data) {
-			pg = nth_page(sg_page(&host->req->sg),
-				      off >> PAGE_SHIFT);
+			pg = sg_page(&host->req->sg) + off / PAGE_SIZE;
 			p_off = offset_in_page(off);
 			p_cnt = PAGE_SIZE - p_off;
 			p_cnt = min(p_cnt, length);

diff --git a/drivers/memstick/host/tifm_ms.c b/drivers/memstick/host/tifm_ms.c
@@ -201,8 +201,7 @@ static unsigned int tifm_ms_transfer_data(struct tifm_ms *host)
 		unsigned int p_off;
 
 		if (host->req->long_data) {
-			pg = nth_page(sg_page(&host->req->sg),
-				      off >> PAGE_SHIFT);
+			pg = sg_page(&host->req->sg) + off / PAGE_SIZE;
 			p_off = offset_in_page(off);
 			p_cnt = PAGE_SIZE - p_off;
 			p_cnt = min(p_cnt, length);

diff --git a/drivers/mmc/host/tifm_sd.c b/drivers/mmc/host/tifm_sd.c
@@ -191,7 +191,7 @@ static void tifm_sd_transfer_data(struct tifm_sd *host)
 		}
 		off = sg[host->sg_pos].offset + host->block_pos;
 
-		pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
+		pg = sg_page(&sg[host->sg_pos]) + off / PAGE_SIZE;
 		p_off = offset_in_page(off);
 		p_cnt = PAGE_SIZE - p_off;
 		p_cnt = min(p_cnt, cnt);
@@ -240,7 +240,7 @@ static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data)
 		}
 		off = sg[host->sg_pos].offset + host->block_pos;
 
-		pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT);
+		pg = sg_page(&sg[host->sg_pos]) + off / PAGE_SIZE;
 		p_off = offset_in_page(off);
 		p_cnt = PAGE_SIZE - p_off;
 		p_cnt = min(p_cnt, cnt);

diff --git a/drivers/mmc/host/usdhi6rol0.c b/drivers/mmc/host/usdhi6rol0.c
@@ -323,7 +323,7 @@ static void usdhi6_blk_bounce(struct usdhi6_host *host,
 
 	host->head_pg.page	= host->pg.page;
 	host->head_pg.mapped	= host->pg.mapped;
-	host->pg.page		= nth_page(host->pg.page, 1);
+	host->pg.page		= host->pg.page + 1;
 	host->pg.mapped		= kmap(host->pg.page);
 
 	host->blk_page = host->bounce_buf;
@@ -503,7 +503,7 @@ static void usdhi6_sg_advance(struct usdhi6_host *host)
 	/* We cannot get here after crossing a page border */
 
 	/* Next page in the same SG */
-	host->pg.page = nth_page(sg_page(host->sg), host->page_idx);
+	host->pg.page = sg_page(host->sg) + host->page_idx;
 	host->pg.mapped = kmap(host->pg.page);
 	host->blk_page = host->pg.mapped;
 

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
@@ -3148,8 +3148,7 @@ void *scsi_kmap_atomic_sg(struct scatterlist *sgl, int sg_count,
 	/* Offset starting from the beginning of first page in this sg-entry */
 	*offset = *offset - len_complete + sg->offset;
 
-	/* Assumption: contiguous pages can be accessed as "page + i" */
-	page = nth_page(sg_page(sg), (*offset >> PAGE_SHIFT));
+	page = sg_page(sg) + *offset / PAGE_SIZE;
 	*offset &= ~PAGE_MASK;
 
 	/* Bytes in this sg-entry from *offset to the end of the page */

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
@@ -1235,8 +1235,7 @@ sg_vma_fault(struct vm_fault *vmf)
 		len = vma->vm_end - sa;
 		len = (len < length) ? len : length;
 		if (offset < len) {
-			struct page *page = nth_page(rsv_schp->pages[k],
-						     offset >> PAGE_SHIFT);
+			struct page *page = rsv_schp->pages[k] + offset / PAGE_SIZE;
 			get_page(page);	/* increment page count */
 			vmf->page = page;
 			return 0; /* success */

diff --git a/drivers/vfio/pci/pds/lm.c b/drivers/vfio/pci/pds/lm.c
@@ -151,8 +151,7 @@ static struct page *pds_vfio_get_file_page(struct pds_vfio_lm_file *lm_file,
 			lm_file->last_offset_sg = sg;
 			lm_file->sg_last_entry += i;
 			lm_file->last_offset = cur_offset;
-			return nth_page(sg_page(sg),
-					(offset - cur_offset) / PAGE_SIZE);
+			return sg_page(sg) + (offset - cur_offset) / PAGE_SIZE;
 		}
 		cur_offset += sg->length;
 	}

diff --git a/drivers/vfio/pci/virtio/migrate.c b/drivers/vfio/pci/virtio/migrate.c
@@ -53,8 +53,7 @@ virtiovf_get_migration_page(struct virtiovf_data_buffer *buf,
 			buf->last_offset_sg = sg;
 			buf->sg_last_entry += i;
 			buf->last_offset = cur_offset;
-			return nth_page(sg_page(sg),
-					(offset - cur_offset) / PAGE_SIZE);
+			return sg_page(sg) + (offset - cur_offset) / PAGE_SIZE;
 		}
 		cur_offset += sg->length;
 	}

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
@@ -198,31 +198,22 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 static size_t adjust_range_hwpoison(struct folio *folio, size_t offset,
 		size_t bytes)
 {
-	struct page *page;
-	size_t n = 0;
-	size_t res = 0;
+	struct page *page = folio_page(folio, offset / PAGE_SIZE);
+	size_t n, safe_bytes;
 
-	/* First page to start the loop. */
-	page = folio_page(folio, offset / PAGE_SIZE);
 	offset %= PAGE_SIZE;
-	while (1) {
+	for (safe_bytes = 0; safe_bytes < bytes; safe_bytes += n) {
+
 		if (is_raw_hwpoison_page_in_hugepage(page))
 			break;
 
 		/* Safe to read n bytes without touching HWPOISON subpage. */
-		n = min(bytes, (size_t)PAGE_SIZE - offset);
-		res += n;
-		bytes -= n;
-		if (!bytes || !n)
-			break;
-		offset += n;
-		if (offset == PAGE_SIZE) {
-			page = nth_page(page, 1);
-			offset = 0;
-		}
+		n = min(bytes - safe_bytes, (size_t)PAGE_SIZE - offset);
+		offset = 0;
+		page++;
 	}
 
-	return res;
+	return safe_bytes;
 }
 
 /*

diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h
@@ -159,7 +159,7 @@ static inline void scatterwalk_map(struct scatter_walk *walk)
 	if (IS_ENABLED(CONFIG_HIGHMEM)) {
 		struct page *page;
 
-		page = nth_page(base_page, offset >> PAGE_SHIFT);
+		page = base_page + offset / PAGE_SIZE;
 		offset = offset_in_page(offset);
 		addr = kmap_local_page(page) + offset;
 	} else {
@@ -259,7 +259,7 @@ static inline void scatterwalk_done_dst(struct scatter_walk *walk,
 		end += (offset_in_page(offset) + offset_in_page(nbytes) +
 			PAGE_SIZE - 1) >> PAGE_SHIFT;
 		for (i = start; i < end; i++)
-			flush_dcache_page(nth_page(base_page, i));
+			flush_dcache_page(base_page + i);
 	}
 	scatterwalk_advance(walk, nbytes);
 }

diff --git a/include/linux/bvec.h b/include/linux/bvec.h
@@ -22,11 +22,8 @@ struct page;
  * @bv_len:    Number of bytes in the address range.
  * @bv_offset: Start of the address range relative to the start of @bv_page.
  *
- * The following holds for a bvec if n * PAGE_SIZE < bv_offset + bv_len:
- *
- *   nth_page(@bv_page, n) == @bv_page + n
- *
- * This holds because page_is_mergeable() checks the above property.
+ * All pages within a bio_vec starting from @bv_page are contiguous and
+ * can simply be iterated (see bvec_advance()).
  */
 struct bio_vec {
 	struct page	*bv_page;