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authorAl Viro <viro@zeniv.linux.org.uk>2014-03-06 21:08:24 -0500
committerTejun Heo <tj@kernel.org>2014-03-07 07:52:26 -0500
commit706c16f2372316a0a8af3be6e2bd6e391c073ca0 (patch)
tree136c7fc3bb7df6503448351d9677c0b45a300a2c
parent0f0ca14386e0431fbedaae5efc550d46cf93b9cf (diff)
downloadop-kernel-dev-706c16f2372316a0a8af3be6e2bd6e391c073ca0.zip
op-kernel-dev-706c16f2372316a0a8af3be6e2bd6e391c073ca0.tar.gz
perpcu: fold pcpu_split_block() into the only caller
... and simplify the results a bit. Makes the next step easier to deal with - we will be changing the data representation for chunk->map[] and it's easier to do if the code in question is not split between pcpu_alloc_area() and pcpu_split_block(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Tejun Heo <tj@kernel.org>
-rw-r--r--mm/percpu.c63
1 files changed, 16 insertions, 47 deletions
diff --git a/mm/percpu.c b/mm/percpu.c
index 036cfe0..592f289 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -418,48 +418,6 @@ out_unlock:
}
/**
- * pcpu_split_block - split a map block
- * @chunk: chunk of interest
- * @i: index of map block to split
- * @head: head size in bytes (can be 0)
- * @tail: tail size in bytes (can be 0)
- *
- * Split the @i'th map block into two or three blocks. If @head is
- * non-zero, @head bytes block is inserted before block @i moving it
- * to @i+1 and reducing its size by @head bytes.
- *
- * If @tail is non-zero, the target block, which can be @i or @i+1
- * depending on @head, is reduced by @tail bytes and @tail byte block
- * is inserted after the target block.
- *
- * @chunk->map must have enough free slots to accommodate the split.
- *
- * CONTEXT:
- * pcpu_lock.
- */
-static void pcpu_split_block(struct pcpu_chunk *chunk, int i,
- int head, int tail)
-{
- int nr_extra = !!head + !!tail;
-
- BUG_ON(chunk->map_alloc < chunk->map_used + nr_extra);
-
- /* insert new subblocks */
- memmove(&chunk->map[i + nr_extra], &chunk->map[i],
- sizeof(chunk->map[0]) * (chunk->map_used - i));
- chunk->map_used += nr_extra;
-
- if (head) {
- chunk->map[i + 1] = chunk->map[i] - head;
- chunk->map[i++] = head;
- }
- if (tail) {
- chunk->map[i++] -= tail;
- chunk->map[i] = tail;
- }
-}
-
-/**
* pcpu_alloc_area - allocate area from a pcpu_chunk
* @chunk: chunk of interest
* @size: wanted size in bytes
@@ -524,14 +482,25 @@ static int pcpu_alloc_area(struct pcpu_chunk *chunk, int size, int align)
/* split if warranted */
if (head || tail) {
- pcpu_split_block(chunk, i, head, tail);
+ int nr_extra = !!head + !!tail;
+
+ /* insert new subblocks */
+ memmove(&chunk->map[i + nr_extra], &chunk->map[i],
+ sizeof(chunk->map[0]) * (chunk->map_used - i));
+ chunk->map_used += nr_extra;
+
if (head) {
- i++;
+ chunk->map[i + 1] = chunk->map[i] - head;
+ chunk->map[i] = head;
off += head;
- max_contig = max(chunk->map[i - 1], max_contig);
+ i++;
+ max_contig = max(head, max_contig);
+ }
+ if (tail) {
+ chunk->map[i] -= tail;
+ chunk->map[i + 1] = tail;
+ max_contig = max(tail, max_contig);
}
- if (tail)
- max_contig = max(chunk->map[i + 1], max_contig);
}
/* update hint and mark allocated */
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