powerpc/nvram: More flexible nvram_create_partition()

Replace nvram_create_os_partition() with a variant that takes
the partition name, signature and size as arguments.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 28 insertions, 18 deletions

diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
index a8154f1813df..9e133355f742 100644
--- a/arch/powerpc/kernel/nvram_64.c
+++ b/arch/powerpc/kernel/nvram_64.c
@@ -307,13 +307,15 @@ static int __init nvram_remove_os_partition(void)
         return 0;
 }
 
-/* nvram_create_os_partition
- *
- * Create a OS linux partition to buffer error logs.
- * Will create a partition starting at the first free
- * space found if space has enough room.
+/**
+ * nvram_create_partition - Create a partition in nvram
+ * @name: name of the partition to create
+ * @sig: signature of the partition to create
+ * @req_size: size to allocate preferrably
+ * @min_size: minimum acceptable size (0 means req_size)
  */
-static int __init nvram_create_os_partition(void)
+static int __init nvram_create_partition(const char *name, int sig,
+                                         int req_size, int min_size)
 {
         struct nvram_partition *part;
         struct nvram_partition *new_part;
@@ -322,20 +324,27 @@ static int __init nvram_create_os_partition(void)
         loff_t tmp_index;
         long size = 0;
         int rc;
-        
+
+        /* If no minimum size specified, make it the same as the
+         * requested size
+         */
+        if (min_size == 0)
+                min_size = req_size;
+
         /* Find a free partition that will give us the maximum needed size 
            If can't find one that will give us the minimum size needed */
         list_for_each_entry(part, &nvram_part->partition, partition) {
                 if (part->header.signature != NVRAM_SIG_FREE)
                         continue;
 
-                if (part->header.length >= NVRAM_MAX_REQ) {
-                        size = NVRAM_MAX_REQ;
+                if (part->header.length >= req_size) {
+                        size = req_size;
                         free_part = part;
                         break;
                 }
-                if (!size && part->header.length >= NVRAM_MIN_REQ) {
-                        size = NVRAM_MIN_REQ;
+                if (part->header.length > size &&
+                    part->header.length >= min_size) {
+                        size = part->header.length;
                         free_part = part;
                 }
         }
@@ -350,9 +359,9 @@ static int __init nvram_create_os_partition(void)
         }
 
         new_part->index = free_part->index;
-        new_part->header.signature = NVRAM_SIG_OS;
+        new_part->header.signature = sig;
         new_part->header.length = size;
-        strcpy(new_part->header.name, "ppc64,linux");
+        strncpy(new_part->header.name, name, 12);
         new_part->header.checksum = nvram_checksum(&new_part->header);
 
         rc = nvram_write_header(new_part);
@@ -451,10 +460,10 @@ static int __init nvram_setup_partition(void)
         }
         
         /* try creating a partition with the free space we have */
-        rc = nvram_create_partition("ppc64,linux", );
-        if (!rc) {
+        rc =    nvram_create_partition("ppc64,linux", NVRAM_SIG_OS,
+                                       NVRAM_MAX_REQ, NVRAM_MIN_REQ);
+        if (!rc)
                 return 0;
-        }
                 
         /* need to free up some space */
         rc = nvram_remove_os_partition();
@@ -463,9 +472,10 @@ static int __init nvram_setup_partition(void)
         }
         
         /* create a partition in this new space */
-        rc = nvram_create_os_partition();
+        rc =    nvram_create_partition("ppc64,linux", NVRAM_SIG_OS,
+                                       NVRAM_MAX_REQ, NVRAM_MIN_REQ);
         if (rc) {
-                printk(KERN_ERR "nvram_create_os_partition: Could not find a "
+                printk(KERN_ERR "nvram_create_partition: Could not find a "
                        "NVRAM partition large enough\n");
                 return rc;
         }