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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: Dennis Zhou <dennis@kernel.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Dennis Zhou 2019-02-26 09:56:16 -08:00
parent da3afdd5bb
commit 047924c968
2 changed files with 14 additions and 7 deletions
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1
mm/percpu-internal.h
View File

@ -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 {

20
mm/percpu.c
View File

@ -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);
}
/**