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authorDennis Zhou <dennis@kernel.org>2019-02-26 20:56:16 +0300
committerDennis Zhou <dennis@kernel.org>2019-03-13 22:25:31 +0300
commit047924c96898266e9a37412434abd1db72600384 (patch)
treef77d37338673405e89644bc682e08a8f7584aa03 /mm/percpu.c
parentda3afdd5bb5428fd38b4b64f2d5e897c3bb78354 (diff)
downloadlinux-047924c96898266e9a37412434abd1db72600384.tar.xz
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>
Diffstat (limited to 'mm/percpu.c')
-rw-r--r--mm/percpu.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/mm/percpu.c b/mm/percpu.c
index c5250e162d4d..acc72d37a830 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -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);
}
/**