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[PATCH] mtd cmdlinepart: allow zero offset value 

Current cmdlinepart.c uses offset value 0 to specify a continuous
partition.  This prevents creating a second partition starting at 0.

For example, I can split 4MB device using "mtdparts=id:2M,2M", but I can
not do "mtdparts=id:2M@2M,2M@0" to swap mtd0 and mtd1.

This patch introduces special OFFSET_CONTINUOUS value for a continuous
partition and allows 0 for offset value.

Also this patch replaces 0xffffffff with UINT_MAX for SIZE_REMAINING.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Atsushi Nemoto 2006-03-31 02:29:46 -08:00 committed by Linus Torvalds
parent 87d10f3c79
commit b175d03dd2
1 changed files with 4 additions and 3 deletions
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7
drivers/mtd/cmdlinepart.c
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@ -42,7 +42,8 @@
/* special size referring to all the remaining space in a partition */
#define SIZE_REMAINING 0xffffffff
#define SIZE_REMAINING UINT_MAX
#define OFFSET_CONTINUOUS UINT_MAX
struct cmdline_mtd_partition {
struct cmdline_mtd_partition *next;
@ -75,7 +76,7 @@ static struct mtd_partition * newpart(char *s,
{
struct mtd_partition *parts;
unsigned long size;
unsigned long offset = 0;
unsigned long offset = OFFSET_CONTINUOUS;
char *name;
int name_len;
unsigned char *extra_mem;
@ -314,7 +315,7 @@ static int parse_cmdline_partitions(struct mtd_info *master,
{
for(i = 0, offset = 0; i < part->num_parts; i++)
{
if (!part->parts[i].offset)
if (part->parts[i].offset == OFFSET_CONTINUOUS)
part->parts[i].offset = offset;
else
offset = part->parts[i].offset;