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| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2006-03-31 02:29:46 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-31 12:18:48 -0800 |
| commit | b175d03dd207283609b7f8bfdaa5dc93ac9b16dd (patch) | |
| tree | 2a570c584d29fccf8159e87ddbd9b1cf4096b00b /drivers/mtd/cmdlinepart.c | |
| parent | 87d10f3c7954d143e509a2af2bca2a27aeb3114d (diff) | |
| download | lwn-b175d03dd207283609b7f8bfdaa5dc93ac9b16dd.tar.gz lwn-b175d03dd207283609b7f8bfdaa5dc93ac9b16dd.zip | |
[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>
Diffstat (limited to 'drivers/mtd/cmdlinepart.c')
| -rw-r--r-- | drivers/mtd/cmdlinepart.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/mtd/cmdlinepart.c b/drivers/mtd/cmdlinepart.c index 6b8bb2e4dcfd..a7a7bfe33879 100644 --- a/drivers/mtd/cmdlinepart.c +++ b/drivers/mtd/cmdlinepart.c @@ -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; |