staging: zcache: fix crash on high memory swap

zcache_put_page() was modified to pass page_address(page) instead of the
actual page structure. In combination with the function signature changes
to tmem_put() and zcache_pampd_create(), zcache_pampd_create() tries to
(re)derive the page structure from the virtual address.  However, if the
original page is a high memory page (or any unmapped page), this
virt_to_page() fails because the page_address() in zcache_put_page()
returned NULL.

This patch changes zcache_put_page() and zcache_get_page() to pass
the page structure instead of the page's virtual address, which
may or may not exist.

Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index 855a5bb56a47d8e591873b05e6be15ec6f4f6ee0..a3f5162bfedcf5fb6f58f42405f3323e18880ed1 100644 (file)
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -1158,7 +1158,7 @@ static void *zcache_pampd_create(char *data, size_t size, bool raw, int eph,
        size_t clen;
        int ret;
        unsigned long count;
-       struct page *page = virt_to_page(data);
+       struct page *page = (struct page *)(data);
        struct zcache_client *cli = pool->client;
        uint16_t client_id = get_client_id_from_client(cli);
        unsigned long zv_mean_zsize;
@@ -1227,7 +1227,7 @@ static int zcache_pampd_get_data(char *data, size_t *bufsize, bool raw,
        int ret = 0;
 
        BUG_ON(is_ephemeral(pool));
-       zv_decompress(virt_to_page(data), pampd);
+       zv_decompress((struct page *)(data), pampd);
        return ret;
 }
 
@@ -1539,7 +1539,7 @@ static int zcache_put_page(int cli_id, int pool_id, struct tmem_oid *oidp,
                goto out;
        if (!zcache_freeze && zcache_do_preload(pool) == 0) {
                /* preload does preempt_disable on success */
-               ret = tmem_put(pool, oidp, index, page_address(page),
+               ret = tmem_put(pool, oidp, index, (char *)(page),
                                PAGE_SIZE, 0, is_ephemeral(pool));
                if (ret < 0) {
                        if (is_ephemeral(pool))
@@ -1572,7 +1572,7 @@ static int zcache_get_page(int cli_id, int pool_id, struct tmem_oid *oidp,
        pool = zcache_get_pool_by_id(cli_id, pool_id);
        if (likely(pool != NULL)) {
                if (atomic_read(&pool->obj_count) > 0)
-                       ret = tmem_get(pool, oidp, index, page_address(page),
+                       ret = tmem_get(pool, oidp, index, (char *)(page),
                                        &size, 0, is_ephemeral(pool));
                zcache_put_pool(pool);
        }