pcpu_find_block

Name:pcpu_find_block_fit - finds the block index to start searching*@chunk: chunk of interest*@alloc_bits: size of request in allocation units*@align: alignment of area (max PAGE_SIZE bytes)*@pop_only: use populated regions only* Given a chunk and an

Proto:static int pcpu_find_block_fit(struct pcpu_chunk *chunk, int alloc_bits, size_t align, bool pop_only)

Type:int

Parameter:

Type	Parameter	Name
struct pcpu_chunk *	chunk
int	alloc_bits
size_t	align
bool	pop_only

1080

chunk_md = chunk_md

1089

bit_off = @a is a power of 2 value (lock relative startingposition of the contig hint , align) - lock relative startingposition of the contig hint

1091

If bit_off + alloc_bits > contig hint for block Then Return -1

1094

bit_off = pcpu_next_hint - determine which hint to use*@block: block of interest*@alloc_bits: size of allocation* This determines if we should scan based on the scan_hint or first_free.* In general, we want to scan from first_free to fulfill allocations by

1095

bits = 0

1097

If Not pop_only || pcpu_is_populated - determines if the region is populated*@chunk: chunk of interest*@bit_off: chunk offset*@bits: size of area*@next_off: return value for the next offset to start searching* For atomic allocations, check if the backing pages are populated Then Break

1101

bit_off = next_off

1102

bits = 0

1105

If bit_off == pcpu_chunk_map_bits - helper to convert nr_pages to size of bitmap*@chunk: chunk of interest* This conversion is from the number of physical pages that the chunk* serves to the number of bits in the bitmap. Then Return -1

1108

Return bit_off

**Caller**
Name	Describe
pcpu_alloc	pcpu_alloc - the percpu allocator@size: size of area to allocate in bytes@align: alignment of area (max PAGE_SIZE)@reserved: allocate from the reserved chunk if available@gfp: allocation flags* Allocate percpu area of @size bytes aligned at @align

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Function report