2 files changed, 6 insertions, 42 deletions

diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c
index e820490f954a..9fe18cd34d4a 100644
--- a/drivers/staging/erofs/unzip_vle.c
+++ b/drivers/staging/erofs/unzip_vle.c
@@ -301,12 +301,9 @@ z_erofs_vle_work_lookup(const struct z_erofs_vle_work_finder *f)
 	grp = container_of(egrp, struct z_erofs_vle_workgroup, obj);
 	*f->grp_ret = grp;
 
-#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF
 	work = z_erofs_vle_grab_work(grp, f->pageofs);
+	/* if multiref is disabled, `primary' is always true */
 	primary = true;
-#else
-	BUG();
-#endif
 
 	DBG_BUGON(work->pageofs != f->pageofs);
 
@@ -368,12 +365,9 @@ z_erofs_vle_work_register(const struct z_erofs_vle_work_finder *f,
 	struct z_erofs_vle_workgroup *grp = *f->grp_ret;
 	struct z_erofs_vle_work *work;
 
-#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF
+	/* if multiref is disabled, grp should never be nullptr */
 	BUG_ON(grp != NULL);
-#else
-	if (grp != NULL)
-		goto skip;
-#endif
+
 	/* no available workgroup, let's allocate one */
 	grp = kmem_cache_zalloc(z_erofs_workgroup_cachep, GFP_NOFS);
 	if (unlikely(grp == NULL))
@@ -396,13 +390,7 @@ z_erofs_vle_work_register(const struct z_erofs_vle_work_finder *f,
 	*f->hosted = true;
 
 	gnew = true;
-#ifdef CONFIG_EROFS_FS_ZIP_MULTIREF
-skip:
-	/* currently unimplemented */
-	BUG();
-#else
 	work = z_erofs_vle_grab_primary_work(grp);
-#endif
 	work->pageofs = f->pageofs;
 
 	mutex_init(&work->lock);
@@ -797,9 +785,7 @@ static int z_erofs_vle_unzip(struct super_block *sb,
 
 	struct z_erofs_pagevec_ctor ctor;
 	unsigned int nr_pages;
-#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF
 	unsigned int sparsemem_pages = 0;
-#endif
 	struct page *pages_onstack[Z_EROFS_VLE_VMAP_ONSTACK_PAGES];
 	struct page **pages, **compressed_pages, *page;
 	unsigned int i, llen;
@@ -811,11 +797,7 @@ static int z_erofs_vle_unzip(struct super_block *sb,
 	int err;
 
 	might_sleep();
-#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF
 	work = z_erofs_vle_grab_primary_work(grp);
-#else
-	BUG();
-#endif
 	BUG_ON(!READ_ONCE(work->nr_pages));
 
 	mutex_lock(&work->lock);
@@ -866,13 +848,11 @@ repeat:
 			pagenr = z_erofs_onlinepage_index(page);
 
 		BUG_ON(pagenr >= nr_pages);
-
-#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF
 		BUG_ON(pages[pagenr] != NULL);
-		++sparsemem_pages;
-#endif
+
 		pages[pagenr] = page;
 	}
+	sparsemem_pages = i;
 
 	z_erofs_pagevec_ctor_exit(&ctor, true);
 
@@ -902,10 +882,8 @@ repeat:
 		pagenr = z_erofs_onlinepage_index(page);
 
 		BUG_ON(pagenr >= nr_pages);
-#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF
 		BUG_ON(pages[pagenr] != NULL);
 		++sparsemem_pages;
-#endif
 		pages[pagenr] = page;
 
 		overlapped = true;
@@ -931,12 +909,10 @@ repeat:
 	if (err != -ENOTSUPP)
 		goto out_percpu;
 
-#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF
 	if (sparsemem_pages >= nr_pages) {
 		BUG_ON(sparsemem_pages > nr_pages);
 		goto skip_allocpage;
 	}
-#endif
 
 	for (i = 0; i < nr_pages; ++i) {
 		if (pages[i] != NULL)
@@ -945,9 +921,7 @@ repeat:
 		pages[i] = __stagingpage_alloc(page_pool, GFP_NOFS);
 	}
 
-#ifndef CONFIG_EROFS_FS_ZIP_MULTIREF
 skip_allocpage:
-#endif
 	vout = erofs_vmap(pages, nr_pages);
 
 	err = z_erofs_vle_unzip_vmap(compressed_pages,
diff --git a/drivers/staging/erofs/unzip_vle.h b/drivers/staging/erofs/unzip_vle.h
index 393998500865..3316bc36965d 100644
--- a/drivers/staging/erofs/unzip_vle.h
+++ b/drivers/staging/erofs/unzip_vle.h
@@ -47,13 +47,6 @@ static inline bool z_erofs_gather_if_stagingpage(struct list_head *page_pool,
 #define Z_EROFS_VLE_INLINE_PAGEVECS     3
 
 struct z_erofs_vle_work {
-	/* struct z_erofs_vle_work *left, *right; */
-
-#ifdef CONFIG_EROFS_FS_ZIP_MULTIREF
-	struct list_head list;
-
-	atomic_t refcount;
-#endif
 	struct mutex lock;
 
 	/* I: decompression offset in page */
@@ -107,10 +100,8 @@ static inline void z_erofs_vle_set_workgrp_fmt(
 	grp->flags = fmt | (grp->flags & ~Z_EROFS_VLE_WORKGRP_FMT_MASK);
 }
 
-#ifdef CONFIG_EROFS_FS_ZIP_MULTIREF
-#error multiref decompression is unimplemented yet
-#else
 
+/* definitions if multiref is disabled */
 #define z_erofs_vle_grab_primary_work(grp)	(&(grp)->work)
 #define z_erofs_vle_grab_work(grp, pageofs)	(&(grp)->work)
 #define z_erofs_vle_work_workgroup(wrk, primary)	\
@@ -118,7 +109,6 @@ static inline void z_erofs_vle_set_workgrp_fmt(
 		struct z_erofs_vle_workgroup, work) : \
 		({ BUG(); (void *)NULL; }))
 
-#endif
 
 #define Z_EROFS_WORKGROUP_SIZE       sizeof(struct z_erofs_vle_workgroup)