per_cpu_ptr_to_phys

Name:per_cpu_ptr_to_phys - convert translated percpu address to physical address*@addr: the address to be converted to physical address* Given @addr which is dereferenceable address obtained via one of* percpu access macros, this function translates it into

Proto:phys_addr_t per_cpu_ptr_to_phys(void *addr)

Type:phys_addr_t

Parameter:

Type	Parameter	Name
void *	addr

2063

__percpu * base = UP, it's always identity mapped (he address of the first chunk which starts with the kernel static area )

2064

bool in_first_chunk = false

2078

first_low = he address of the first chunk which starts with the kernel static area + pcpu_unit_page_offset(cpus with the lowest and highest unit addresses , 0)

2080

first_high = he address of the first chunk which starts with the kernel static area + pcpu_unit_page_offset(pcpu_high_unit_cpu, pcpu_unit_pages)

2082

If addr >= first_low && addr < first_high Then

2084

for_each_possible_cpu(cpu)

2085

start = per_cpu_ptr(base, cpu)

2087

If addr >= start && addr < start + pcpu_unit_size Then

2088

in_first_chunk = true

2089

Break

2094

If in_first_chunk Then

2095

If Not Determine if an address is within the vmalloc range* On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there* is no special casing required. Then Return __pa(addr)

2097

Else Return Change "struct page" to physical address.(Support for virtually mapped pages ) + offset_in_page(addr)

2100

Else Return Change "struct page" to physical address.(pcpu_addr_to_page(addr)) + offset_in_page(addr)

**Caller**
Name	Describe
get_cpu_gdt_paddr	Provide the physical address of the GDT page.

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