1 files changed, 18 insertions, 7 deletions

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index baa6f95e962..43ce26d0f92 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -303,6 +303,9 @@ struct nandsim {
         /* The simulated NAND flash pages array */
         union ns_mem *pages;
 
+        /* Slab allocator for nand pages */
+        struct kmem_cache *nand_pages_slab;
+
         /* Internal buffer of page + OOB size bytes */
         union ns_mem buf;
 
@@ -435,8 +438,8 @@ static struct mtd_info *nsmtd;
 static u_char ns_verify_buf[NS_LARGEST_PAGE_SIZE];
 
 /*
- * Allocate array of page pointers and initialize the array to NULL
- * pointers.
+ * Allocate array of page pointers, create slab allocation for an array
+ * and initialize the array by NULL pointers.
  *
  * RETURNS: 0 if success, -ENOMEM if memory alloc fails.
  */
@@ -484,6 +487,12 @@ static int alloc_device(struct nandsim *ns)
         for (i = 0; i < ns->geom.pgnum; i++) {
                 ns->pages[i].byte = NULL;
         }
+        ns->nand_pages_slab = kmem_cache_create("nandsim",
+                                                ns->geom.pgszoob, 0, 0, NULL);
+        if (!ns->nand_pages_slab) {
+                NS_ERR("cache_create: unable to create kmem_cache\n");
+                return -ENOMEM;
+        }
 
         return 0;
 
@@ -511,8 +520,10 @@ static void free_device(struct nandsim *ns)
         if (ns->pages) {
                 for (i = 0; i < ns->geom.pgnum; i++) {
                         if (ns->pages[i].byte)
-                                kfree(ns->pages[i].byte);
+                                kmem_cache_free(ns->nand_pages_slab,
+                                                ns->pages[i].byte);
                 }
+                kmem_cache_destroy(ns->nand_pages_slab);
                 vfree(ns->pages);
         }
 }
@@ -1475,7 +1486,7 @@ static void erase_sector(struct nandsim *ns)
         for (i = 0; i < ns->geom.pgsec; i++) {
                 if (mypage->byte != NULL) {
                         NS_DBG("erase_sector: freeing page %d\n", ns->regs.row+i);
-                        kfree(mypage->byte);
+                        kmem_cache_free(ns->nand_pages_slab, mypage->byte);
                         mypage->byte = NULL;
                 }
                 mypage++;
@@ -1538,10 +1549,10 @@ static int prog_page(struct nandsim *ns, int num)
                 /*
                  * We allocate memory with GFP_NOFS because a flash FS may
                  * utilize this. If it is holding an FS lock, then gets here,
-                 * then kmalloc runs writeback which goes to the FS again
-                 * and deadlocks. This was seen in practice.
+                 * then kernel memory alloc runs writeback which goes to the FS
+                 * again and deadlocks. This was seen in practice.
                  */
-                mypage->byte = kmalloc(ns->geom.pgszoob, GFP_NOFS);
+                mypage->byte = kmem_cache_alloc(ns->nand_pages_slab, GFP_NOFS);
                 if (mypage->byte == NULL) {
                         NS_ERR("prog_page: error allocating memory for page %d\n", ns->regs.row);
                         return -1;