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Subject[PATCH 10/12] percpu: make pcpu_block_md generic
Date
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>
---
mm/percpu-internal.h | 1 +
mm/percpu.c | 20 +++++++++++++-------
2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h
index ec58b244545d..119bd1119aa7 100644
--- a/mm/percpu-internal.h
+++ b/mm/percpu-internal.h
@@ -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 {
diff --git a/mm/percpu.c b/mm/percpu.c
index e51c151ed692..7cdf14c242de 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -658,7 +658,7 @@ 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) {
@@ -1271,18 +1271,24 @@ 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);
}

/**
--
2.17.1
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