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author | Al Viro <viro@zeniv.linux.org.uk> | 2014-03-06 21:08:24 -0500 |
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committer | Tejun Heo <tj@kernel.org> | 2014-03-07 07:52:26 -0500 |
commit | 706c16f2372316a0a8af3be6e2bd6e391c073ca0 (patch) | |
tree | 136c7fc3bb7df6503448351d9677c0b45a300a2c /mm/percpu.c | |
parent | 0f0ca14386e0431fbedaae5efc550d46cf93b9cf (diff) | |
download | linux-stable-706c16f2372316a0a8af3be6e2bd6e391c073ca0.tar.gz linux-stable-706c16f2372316a0a8af3be6e2bd6e391c073ca0.tar.bz2 linux-stable-706c16f2372316a0a8af3be6e2bd6e391c073ca0.zip |
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>
Diffstat (limited to 'mm/percpu.c')
-rw-r--r-- | mm/percpu.c | 63 |
1 files changed, 16 insertions, 47 deletions
diff --git a/mm/percpu.c b/mm/percpu.c index 036cfe07050f..592f289819b7 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 */ |