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resources: add resource_overlaps()

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Add resource_overlaps(), which returns true if two resources overlap at all.

Use this to replace the complicated check in coalesce_windows().

Signed-Off-By: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Wei Yang 2012-04-26 15:32:55 +08:00 committed by Bjorn Helgaas
parent 1267b3a325
commit 74d24b219b
2 changed files with 8 additions and 11 deletions
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12
arch/x86/pci/acpi.c
View file

@ -245,13 +245,6 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
return AE_OK;
}
static bool resource_contains(struct resource *res, resource_size_t point)
{
if (res->start <= point && point <= res->end)
return true;
return false;
}
static void coalesce_windows(struct pci_root_info *info, unsigned long type)
{
int i, j;
@ -272,10 +265,7 @@ static void coalesce_windows(struct pci_root_info *info, unsigned long type)
* our resources no longer match the ACPI _CRS, but
* the kernel resource tree doesn't allow overlaps.
*/
if (resource_contains(res1, res2->start) ||
resource_contains(res1, res2->end) ||
resource_contains(res2, res1->start) ||
resource_contains(res2, res1->end)) {
if (resource_overlaps(res1, res2)) {
res1->start = min(res1->start, res2->start);
res1->end = max(res1->end, res2->end);
dev_info(&info->bridge->dev,

7
include/linux/ioport.h
View file

@ -223,5 +223,12 @@ extern int
walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
void *arg, int (*func)(unsigned long, unsigned long, void *));
/* True if any part of r1 overlaps r2 */
static inline bool resource_overlaps(struct resource *r1, struct resource *r2)
{
return (r1->start <= r2->end && r1->end >= r2->start);
}
#endif /* __ASSEMBLY__ */
#endif /* _LINUX_IOPORT_H */