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authorTejun Heo <tj@kernel.org>2014-09-02 22:46:01 +0400
committerTejun Heo <tj@kernel.org>2014-09-02 22:46:01 +0400
commitdca496451bddea9aa87b7510dc2eb413d1a19dfd (patch)
treec1d926663786fd919d3a9d19659ce80696d7558f /mm/percpu-vm.c
parentcdb4cba5a3c9fa27240d04f4f8dad316b10d995b (diff)
downloadlinux-dca496451bddea9aa87b7510dc2eb413d1a19dfd.tar.xz
percpu: move common parts out of pcpu_[de]populate_chunk()
percpu-vm and percpu-km implement separate versions of pcpu_[de]populate_chunk() and some part which is or should be common are currently in the specific implementations. Make the following changes. * Allocate area clearing is moved from the pcpu_populate_chunk() implementations to pcpu_alloc(). This makes percpu-km's version noop. * Quick exit tests in pcpu_[de]populate_chunk() of percpu-vm are moved to their respective callers so that they are applied to percpu-km too. This doesn't make any meaningful difference as both functions are noop for percpu-km; however, this is more consistent and will help implementing atomic allocation support. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'mm/percpu-vm.c')
-rw-r--r--mm/percpu-vm.c27
1 files changed, 1 insertions, 26 deletions
diff --git a/mm/percpu-vm.c b/mm/percpu-vm.c
index d9e0b615492e..edf709793318 100644
--- a/mm/percpu-vm.c
+++ b/mm/percpu-vm.c
@@ -265,7 +265,7 @@ static void pcpu_post_map_flush(struct pcpu_chunk *chunk,
* @size: size of the area to populate in bytes
*
* For each cpu, populate and map pages [@page_start,@page_end) into
- * @chunk. The area is cleared on return.
+ * @chunk.
*
* CONTEXT:
* pcpu_alloc_mutex, does GFP_KERNEL allocation.
@@ -276,18 +276,8 @@ static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
int page_end = PFN_UP(off + size);
int free_end = page_start, unmap_end = page_start;
struct page **pages;
- unsigned int cpu;
int rs, re, rc;
- /* quick path, check whether all pages are already there */
- rs = page_start;
- pcpu_next_pop(chunk, &rs, &re, page_end);
- if (rs == page_start && re == page_end)
- goto clear;
-
- /* need to allocate and map pages, this chunk can't be immutable */
- WARN_ON(chunk->immutable);
-
pages = pcpu_get_pages(chunk);
if (!pages)
return -ENOMEM;
@@ -308,10 +298,6 @@ static int pcpu_populate_chunk(struct pcpu_chunk *chunk, int off, int size)
}
pcpu_post_map_flush(chunk, page_start, page_end);
- bitmap_set(chunk->populated, page_start, page_end - page_start);
-clear:
- for_each_possible_cpu(cpu)
- memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0, size);
return 0;
err_unmap:
@@ -345,15 +331,6 @@ static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size)
struct page **pages;
int rs, re;
- /* quick path, check whether it's empty already */
- rs = page_start;
- pcpu_next_unpop(chunk, &rs, &re, page_end);
- if (rs == page_start && re == page_end)
- return;
-
- /* immutable chunks can't be depopulated */
- WARN_ON(chunk->immutable);
-
/*
* If control reaches here, there must have been at least one
* successful population attempt so the temp pages array must
@@ -372,8 +349,6 @@ static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size)
pcpu_for_each_pop_region(chunk, rs, re, page_start, page_end)
pcpu_free_pages(chunk, pages, rs, re);
-
- bitmap_clear(chunk->populated, page_start, page_end - page_start);
}
static struct pcpu_chunk *pcpu_create_chunk(void)