zsmalloc: remove old object read API

There are no users left of the old API, all have switched to SG-list
object read API.  Remove it.

Link: https://lore.kernel.org/20260907105739.1793316-3-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nhat Pham <nphamcs@gmail.com>

2 files changed, 0 insertions, 81 deletions

diff --git a/include/linux/zsmalloc.h b/include/linux/zsmalloc.h
index 478410c880b1..5b7298a5026b 100644
--- a/include/linux/zsmalloc.h
+++ b/include/linux/zsmalloc.h
@@ -40,10 +40,6 @@ unsigned int zs_lookup_class_index(struct zs_pool *pool, unsigned int size);
 
 void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats);
 
-void *zs_obj_read_begin(struct zs_pool *pool, unsigned long handle,
-			size_t mem_len, void *local_copy);
-void zs_obj_read_end(struct zs_pool *pool, unsigned long handle,
-		     size_t mem_len, void *handle_mem);
 void zs_obj_read_sg_begin(struct zs_pool *pool, unsigned long handle,
 			  struct scatterlist *sg, size_t mem_len);
 void zs_obj_read_sg_end(struct zs_pool *pool, unsigned long handle);
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 825022a7a328..11be37c43171 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1134,83 +1134,6 @@ unsigned long zs_get_total_pages(struct zs_pool *pool)
 }
 EXPORT_SYMBOL_GPL(zs_get_total_pages);
 
-void *zs_obj_read_begin(struct zs_pool *pool, unsigned long handle,
-			size_t mem_len, void *local_copy)
-{
-	struct zspage *zspage;
-	struct zpdesc *zpdesc;
-	unsigned long obj, off;
-	unsigned int obj_idx;
-	struct size_class *class;
-	void *addr;
-
-	/* Guarantee we can get zspage from handle safely */
-	read_lock(&pool->lock);
-	obj = handle_to_obj(handle);
-	obj_to_location(obj, &zpdesc, &obj_idx);
-	zspage = get_zspage(zpdesc);
-
-	/* Make sure migration doesn't move any pages in this zspage */
-	zspage_read_lock(zspage);
-	read_unlock(&pool->lock);
-
-	class = zspage_class(pool, zspage);
-	off = offset_in_page(class->size * obj_idx);
-
-	if (!ZsHugePage(zspage))
-		off += ZS_HANDLE_SIZE;
-
-	if (off + mem_len <= PAGE_SIZE) {
-		/* this object is contained entirely within a page */
-		addr = kmap_local_zpdesc(zpdesc);
-		addr += off;
-	} else {
-		size_t sizes[2];
-
-		/* this object spans two pages */
-		sizes[0] = PAGE_SIZE - off;
-		sizes[1] = mem_len - sizes[0];
-		addr = local_copy;
-
-		memcpy_from_page(addr, zpdesc_page(zpdesc),
-				 off, sizes[0]);
-		zpdesc = get_next_zpdesc(zpdesc);
-		memcpy_from_page(addr + sizes[0],
-				 zpdesc_page(zpdesc),
-				 0, sizes[1]);
-	}
-
-	return addr;
-}
-EXPORT_SYMBOL_GPL(zs_obj_read_begin);
-
-void zs_obj_read_end(struct zs_pool *pool, unsigned long handle,
-		     size_t mem_len, void *handle_mem)
-{
-	struct zspage *zspage;
-	struct zpdesc *zpdesc;
-	unsigned long obj, off;
-	unsigned int obj_idx;
-	struct size_class *class;
-
-	obj = handle_to_obj(handle);
-	obj_to_location(obj, &zpdesc, &obj_idx);
-	zspage = get_zspage(zpdesc);
-	class = zspage_class(pool, zspage);
-	off = offset_in_page(class->size * obj_idx);
-
-	if (!ZsHugePage(zspage))
-		off += ZS_HANDLE_SIZE;
-
-	if (off + mem_len <= PAGE_SIZE) {
-		handle_mem -= off;
-		kunmap_local(handle_mem);
-	}
-
-	zspage_read_unlock(zspage);
-}
-EXPORT_SYMBOL_GPL(zs_obj_read_end);
-
 void zs_obj_read_sg_begin(struct zs_pool *pool, unsigned long handle,
 			  struct scatterlist *sg, size_t mem_len)
 {