alloc_resource

Name:alloc_resource

Proto:static struct resource *alloc_resource(gfp_t flags)

Type:struct resource

Parameter:

Type	Parameter	Name
gfp_t	flags

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struct resource * res = NULL

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spin_lock( & bootmem_resource_lock)

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If For memory hotplug, there is no way to free resource entries allocated* by boot mem after the system is up. So for reusing the resource entry* we need to remember the resource. Then

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res = For memory hotplug, there is no way to free resource entries allocated* by boot mem after the system is up. So for reusing the resource entry* we need to remember the resource.

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For memory hotplug, there is no way to free resource entries allocated* by boot mem after the system is up. So for reusing the resource entry* we need to remember the resource. = sibling

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spin_unlock( & bootmem_resource_lock)

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If res Then memset(res, 0, sizeof(structresource))

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Else res = kzalloc - allocate memory. The memory is set to zero.*@size: how many bytes of memory are required.*@flags: the type of memory to allocate (see kmalloc).

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Return res

**Caller**
Name	Describe
__reserve_region_with_split
__request_region	__request_region - create a new busy resource region@parent: parent resource descriptor@start: resource start address@n: resource region size@name: reserving caller's ID string*@flags: IO resource flags

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