GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-21 22:21:21 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

percpu: move common parts out of pcpu_[de]populate_chunk()

Browse source 
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>
This commit is contained in:
Tejun Heo 2014-09-02 14:46:01 -04:00
parent cdb4cba5a3
commit dca496451b
3 changed files with 31 additions and 40 deletions
Download patch file Download diff file Expand all files Collapse all files

27
mm/percpu-vm.c
View file

@ -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)