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powerpc/nvram: nvram_create_partitions() now uses bytes 

This converts nvram_create_partition() to use a size in bytes
rather than blocks. It does the appropriate alignment internally

The size passed is also the data size (ie. doesn't include the
header anymore).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2010-07-29 18:18:44 +10:00
parent 4e7c77a385
commit 36673307ae
1 changed files with 14 additions and 6 deletions
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20
arch/powerpc/kernel/nvram_64.c
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@ -34,10 +34,10 @@
#undef DEBUG_NVRAM
#define NVRAM_HEADER_LEN 16 /* sizeof(struct nvram_header) */
#define NVRAM_BLOCK_LEN 16
#define NVRAM_MAX_REQ (2080/NVRAM_BLOCK_LEN)
#define NVRAM_MIN_REQ (1056/NVRAM_BLOCK_LEN)
#define NVRAM_HEADER_LEN sizeof(struct nvram_header)
#define NVRAM_BLOCK_LEN NVRAM_HEADER_LEN
#define NVRAM_MAX_REQ 2079
#define NVRAM_MIN_REQ 1055
/* If change this size, then change the size of NVNAME_LEN */
struct nvram_header {
@ -311,7 +311,7 @@ static int __init nvram_remove_os_partition(void)
* 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
* @req_size: size of data to allocate in bytes
* @min_size: minimum acceptable size (0 means req_size)
*/
static int __init nvram_create_partition(const char *name, int sig,
@ -325,12 +325,20 @@ static int __init nvram_create_partition(const char *name, int sig,
long size = 0;
int rc;
/* Convert sizes from bytes to blocks */
req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
/* If no minimum size specified, make it the same as the
* requested size
*/
if (min_size == 0)
min_size = req_size;
/* Now add one block to each for the header */
req_size += 1;
min_size += 1;
/* 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) {
@ -450,7 +458,7 @@ static int __init nvram_setup_partition(void)
if (strcmp(part->header.name, "ppc64,linux"))
continue;
if (part->header.length >= NVRAM_MIN_REQ) {
if ((part->header.length - 1) * NVRAM_BLOCK_LEN >= NVRAM_MIN_REQ) {
/* found our partition */
nvram_error_log_index = part->index + NVRAM_HEADER_LEN;
nvram_error_log_size = ((part->header.length - 1) *