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resource: add resource_size()

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Avoid one-off errors by introducing a resource_size() function.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Magnus Damm 2008-07-29 22:32:57 -07:00 committed by Linus Torvalds
parent e958d3ace7
commit 1a4e564b7d
2 changed files with 5 additions and 1 deletions
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4
include/linux/ioport.h
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@ -118,6 +118,10 @@ extern int allocate_resource(struct resource *root, struct resource *new,
int adjust_resource(struct resource *res, resource_size_t start,
resource_size_t size);
resource_size_t resource_alignment(struct resource *res);
static inline resource_size_t resource_size(struct resource *res)
{
return res->end - res->start + 1;
}
/* Convenience shorthand with allocation */
#define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name))

2
kernel/resource.c
View File

@ -490,7 +490,7 @@ resource_size_t resource_alignment(struct resource *res)
{
switch (res->flags & (IORESOURCE_SIZEALIGN | IORESOURCE_STARTALIGN)) {
case IORESOURCE_SIZEALIGN:
return res->end - res->start + 1;
return resource_size(res);
case IORESOURCE_STARTALIGN:
return res->start;
default: