Commit 047924c9 authored by Dennis Zhou's avatar Dennis Zhou
Browse files

percpu: make pcpu_block_md generic 



In reality, a chunk is just a block covering a larger number of bits.
The hints themselves are one in the same. Rather than maintaining the
hints separately, first introduce nr_bits to genericize
pcpu_block_update() to correctly maintain block->right_free. The next
patch will convert chunk hints to be managed as a pcpu_block_md.

Signed-off-by: default avatarDennis Zhou <dennis@kernel.org>
Reviewed-by: default avatarPeng Fan <peng.fan@nxp.com>
parent da3afdd5

mm/percpu-internal.h

+1 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ struct pcpu_block_md { 
	int                     right_free;     /* size of free space along

						   the right side of the block */

	int                     first_free;     /* block position of first free */

	int			nr_bits;	/* total bits responsible for */

};



struct pcpu_chunk {

mm/percpu.c

+13 −7
Original line number Diff line number Diff line
@@ -654,7 +654,7 @@ static void pcpu_block_update(struct pcpu_block_md *block, int start, int end) 
	if (start == 0)

		block->left_free = contig;



	if (end == PCPU_BITMAP_BLOCK_BITS)

	if (end == block->nr_bits)

		block->right_free = contig;



	if (contig > block->contig_hint) {
@@ -1267,18 +1267,24 @@ static void pcpu_free_area(struct pcpu_chunk *chunk, int off) 
	pcpu_chunk_relocate(chunk, oslot);

}



static void pcpu_init_md_block(struct pcpu_block_md *block, int nr_bits)

{

	block->scan_hint = 0;

	block->contig_hint = nr_bits;

	block->left_free = nr_bits;

	block->right_free = nr_bits;

	block->first_free = 0;

	block->nr_bits = nr_bits;

}



static void pcpu_init_md_blocks(struct pcpu_chunk *chunk)

{

	struct pcpu_block_md *md_block;



	for (md_block = chunk->md_blocks;

	     md_block != chunk->md_blocks + pcpu_chunk_nr_blocks(chunk);

	     md_block++) {

		md_block->scan_hint = 0;

		md_block->contig_hint = PCPU_BITMAP_BLOCK_BITS;

		md_block->left_free = PCPU_BITMAP_BLOCK_BITS;

		md_block->right_free = PCPU_BITMAP_BLOCK_BITS;

	}

	     md_block++)

		pcpu_init_md_block(md_block, PCPU_BITMAP_BLOCK_BITS);

}



/**

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