staging: zsmalloc: zsmalloc: use unsigned long instead of void *
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.
changelog
* from v2
- remove hval pointed out by Nitin
- based on next-20120607
* from v1
- change zcache's zv_create return value
- baesd on next-20120604
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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_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 @@
}
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 @@
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 @@
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 @@
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 @@
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 @@
/* 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);
}