We should use unsigned long as handle instead of void * to avoid any confusion. Without this, users may just treat zs_malloc return value as a pointer and try to deference it. This patch passed compile test(zram, zcache and ramster) and zram is tested on qemu. Cc: Seth Jennings <sjenning@xxxxxxxxxxxxxxxxxx> Cc: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Cc: Nitin Gupta <ngupta@xxxxxxxxxx> Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx> --- Nitin, Konrad and I discussed and concluded that we should use 'unsigned long' instead of 'void *'. Look at the lengthy thread if you have a question. http://marc.info/?l=linux-mm&m=133716653118566&w=4 Watch out! it has number of noises. drivers/staging/zcache/zcache-main.c | 12 ++++++------ drivers/staging/zram/zram_drv.c | 16 ++++++++-------- drivers/staging/zram/zram_drv.h | 2 +- drivers/staging/zsmalloc/zsmalloc-main.c | 24 ++++++++++++------------ drivers/staging/zsmalloc/zsmalloc.h | 8 ++++---- 5 files changed, 31 insertions(+), 31 deletions(-) diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c index 2734dac..4c218a7 100644 --- a/drivers/staging/zcache/zcache-main.c +++ b/drivers/staging/zcache/zcache-main.c @@ -700,7 +700,7 @@ static struct zv_hdr *zv_create(struct zs_pool *pool, uint32_t pool_id, struct zv_hdr *zv; u32 size = clen + sizeof(struct zv_hdr); int chunks = (size + (CHUNK_SIZE - 1)) >> CHUNK_SHIFT; - void *handle = NULL; + unsigned long handle = 0; BUG_ON(!irqs_disabled()); BUG_ON(chunks >= NCHUNKS); @@ -718,10 +718,10 @@ static struct zv_hdr *zv_create(struct zs_pool *pool, uint32_t pool_id, memcpy((char *)zv + sizeof(struct zv_hdr), cdata, clen); zs_unmap_object(pool, handle); out: - return handle; + return (struct zv_hdr *)handle; } -static void zv_free(struct zs_pool *pool, void *handle) +static void zv_free(struct zs_pool *pool, unsigned long handle) { unsigned long flags; struct zv_hdr *zv; @@ -743,7 +743,7 @@ static void zv_free(struct zs_pool *pool, void *handle) local_irq_restore(flags); } -static void zv_decompress(struct page *page, void *handle) +static void zv_decompress(struct page *page, unsigned long handle) { unsigned int clen = PAGE_SIZE; char *to_va; @@ -1247,7 +1247,7 @@ static int zcache_pampd_get_data(char *data, size_t *bufsize, bool raw, int ret = 0; BUG_ON(is_ephemeral(pool)); - zv_decompress((struct page *)(data), pampd); + zv_decompress((struct page *)(data), (unsigned long)pampd); return ret; } @@ -1282,7 +1282,7 @@ static void zcache_pampd_free(void *pampd, struct tmem_pool *pool, atomic_dec(&zcache_curr_eph_pampd_count); BUG_ON(atomic_read(&zcache_curr_eph_pampd_count) < 0); } else { - zv_free(cli->zspool, pampd); + zv_free(cli->zspool, (unsigned long)pampd); atomic_dec(&zcache_curr_pers_pampd_count); BUG_ON(atomic_read(&zcache_curr_pers_pampd_count) < 0); } diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index 685d612..abd69d1 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -135,7 +135,7 @@ static void zram_set_disksize(struct zram *zram, size_t totalram_bytes) static void zram_free_page(struct zram *zram, size_t index) { - void *handle = zram->table[index].handle; + unsigned long handle = zram->table[index].handle; if (unlikely(!handle)) { /* @@ -150,7 +150,7 @@ static void zram_free_page(struct zram *zram, size_t index) } if (unlikely(zram_test_flag(zram, index, ZRAM_UNCOMPRESSED))) { - __free_page(handle); + __free_page((struct page *)handle); zram_clear_flag(zram, index, ZRAM_UNCOMPRESSED); zram_stat_dec(&zram->stats.pages_expand); goto out; @@ -166,7 +166,7 @@ out: zram->table[index].size); zram_stat_dec(&zram->stats.pages_stored); - zram->table[index].handle = NULL; + zram->table[index].handle = 0; zram->table[index].size = 0; } @@ -189,7 +189,7 @@ static void handle_uncompressed_page(struct zram *zram, struct bio_vec *bvec, unsigned char *user_mem, *cmem; user_mem = kmap_atomic(page); - cmem = kmap_atomic(zram->table[index].handle); + cmem = kmap_atomic((struct page *)zram->table[index].handle); memcpy(user_mem + bvec->bv_offset, cmem + offset, bvec->bv_len); kunmap_atomic(cmem); @@ -317,7 +317,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index, int ret; u32 store_offset; size_t clen; - void *handle; + unsigned long handle; struct zobj_header *zheader; struct page *page, *page_store; unsigned char *user_mem, *cmem, *src, *uncmem = NULL; @@ -399,7 +399,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index, store_offset = 0; zram_set_flag(zram, index, ZRAM_UNCOMPRESSED); zram_stat_inc(&zram->stats.pages_expand); - handle = page_store; + handle = (unsigned long)page_store; src = kmap_atomic(page); cmem = kmap_atomic(page_store); goto memstore; @@ -592,12 +592,12 @@ void __zram_reset_device(struct zram *zram) /* Free all pages that are still in this zram device */ for (index = 0; index < zram->disksize >> PAGE_SHIFT; index++) { - void *handle = zram->table[index].handle; + unsigned long handle = zram->table[index].handle; if (!handle) continue; if (unlikely(zram_test_flag(zram, index, ZRAM_UNCOMPRESSED))) - __free_page(handle); + __free_page((struct page *)handle); else zs_free(zram->mem_pool, handle); } diff --git a/drivers/staging/zram/zram_drv.h b/drivers/staging/zram/zram_drv.h index fbe8ac9..7a7e256 100644 --- a/drivers/staging/zram/zram_drv.h +++ b/drivers/staging/zram/zram_drv.h @@ -81,7 +81,7 @@ enum zram_pageflags { /* Allocated for each disk page */ struct table { - void *handle; + unsigned long handle; u16 size; /* object size (excluding header) */ u8 count; /* object ref count (not yet used) */ u8 flags; diff --git a/drivers/staging/zsmalloc/zsmalloc-main.c b/drivers/staging/zsmalloc/zsmalloc-main.c index 4496737..ae10a1a 100644 --- a/drivers/staging/zsmalloc/zsmalloc-main.c +++ b/drivers/staging/zsmalloc/zsmalloc-main.c @@ -247,10 +247,10 @@ static void *obj_location_to_handle(struct page *page, unsigned long obj_idx) } /* Decode <page, obj_idx> pair from the given object handle */ -static void obj_handle_to_location(void *handle, struct page **page, +static void obj_handle_to_location(unsigned long handle, struct page **page, unsigned long *obj_idx) { - unsigned long hval = (unsigned long)handle; + unsigned long hval = handle; *page = pfn_to_page(hval >> OBJ_INDEX_BITS); *obj_idx = hval & OBJ_INDEX_MASK; @@ -568,12 +568,12 @@ EXPORT_SYMBOL_GPL(zs_destroy_pool); * @size: size of block to allocate * * On success, handle to the allocated object is returned, - * otherwise NULL. + * otherwise 0. * Allocation requests with size > ZS_MAX_ALLOC_SIZE will fail. */ -void *zs_malloc(struct zs_pool *pool, size_t size) +unsigned long zs_malloc(struct zs_pool *pool, size_t size) { - void *obj; + unsigned long obj; struct link_free *link; int class_idx; struct size_class *class; @@ -582,7 +582,7 @@ void *zs_malloc(struct zs_pool *pool, size_t size) unsigned long m_objidx, m_offset; if (unlikely(!size || size > ZS_MAX_ALLOC_SIZE)) - return NULL; + return 0; class_idx = get_size_class_index(size); class = &pool->size_class[class_idx]; @@ -595,14 +595,14 @@ void *zs_malloc(struct zs_pool *pool, size_t size) spin_unlock(&class->lock); first_page = alloc_zspage(class, pool->flags); if (unlikely(!first_page)) - return NULL; + return 0; set_zspage_mapping(first_page, class->index, ZS_EMPTY); spin_lock(&class->lock); class->pages_allocated += class->pages_per_zspage; } - obj = first_page->freelist; + obj = (unsigned long)first_page->freelist; obj_handle_to_location(obj, &m_page, &m_objidx); m_offset = obj_idx_to_offset(m_page, m_objidx, class->size); @@ -621,7 +621,7 @@ void *zs_malloc(struct zs_pool *pool, size_t size) } EXPORT_SYMBOL_GPL(zs_malloc); -void zs_free(struct zs_pool *pool, void *obj) +void zs_free(struct zs_pool *pool, unsigned long obj) { struct link_free *link; struct page *first_page, *f_page; @@ -648,7 +648,7 @@ void zs_free(struct zs_pool *pool, void *obj) + f_offset); link->next = first_page->freelist; kunmap_atomic(link); - first_page->freelist = obj; + first_page->freelist = (void *)obj; first_page->inuse--; fullness = fix_fullness_group(pool, first_page); @@ -672,7 +672,7 @@ EXPORT_SYMBOL_GPL(zs_free); * this function. When done with the object, it must be unmapped using * zs_unmap_object */ -void *zs_map_object(struct zs_pool *pool, void *handle) +void *zs_map_object(struct zs_pool *pool, unsigned long handle) { struct page *page; unsigned long obj_idx, off; @@ -712,7 +712,7 @@ void *zs_map_object(struct zs_pool *pool, void *handle) } EXPORT_SYMBOL_GPL(zs_map_object); -void zs_unmap_object(struct zs_pool *pool, void *handle) +void zs_unmap_object(struct zs_pool *pool, unsigned long handle) { struct page *page; unsigned long obj_idx, off; diff --git a/drivers/staging/zsmalloc/zsmalloc.h b/drivers/staging/zsmalloc/zsmalloc.h index 949384e..485cbb1 100644 --- a/drivers/staging/zsmalloc/zsmalloc.h +++ b/drivers/staging/zsmalloc/zsmalloc.h @@ -20,11 +20,11 @@ struct zs_pool; struct zs_pool *zs_create_pool(const char *name, gfp_t flags); void zs_destroy_pool(struct zs_pool *pool); -void *zs_malloc(struct zs_pool *pool, size_t size); -void zs_free(struct zs_pool *pool, void *obj); +unsigned long zs_malloc(struct zs_pool *pool, size_t size); +void zs_free(struct zs_pool *pool, unsigned long obj); -void *zs_map_object(struct zs_pool *pool, void *handle); -void zs_unmap_object(struct zs_pool *pool, void *handle); +void *zs_map_object(struct zs_pool *pool, unsigned long handle); +void zs_unmap_object(struct zs_pool *pool, unsigned long handle); u64 zs_get_total_size_bytes(struct zs_pool *pool); -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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