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percpu: reorder a few functions in mm/percpu.c 

(de)populate functions are about to be reimplemented to drop
pcpu_chunk->page array.  Move a few functions so that the rewrite
patch doesn't have code movement making it more difficult to read.

[ Impact: code movement ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
wifi-calibration
Tejun Heo 2009-07-04 08:10:59 +09:00
parent 38a6be5254
commit c8a51be4ca
1 changed files with 45 additions and 45 deletions
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90
mm/percpu.c
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@ -181,12 +181,6 @@ static int pcpu_page_idx(unsigned int cpu, int page_idx)
return cpu * pcpu_unit_pages + page_idx;
}
static struct page **pcpu_chunk_pagep(struct pcpu_chunk *chunk,
unsigned int cpu, int page_idx)
{
return &chunk->page[pcpu_page_idx(cpu, page_idx)];
}
static unsigned long pcpu_chunk_addr(struct pcpu_chunk *chunk,
unsigned int cpu, int page_idx)
{
@ -194,6 +188,12 @@ static unsigned long pcpu_chunk_addr(struct pcpu_chunk *chunk,
(pcpu_page_idx(cpu, page_idx) << PAGE_SHIFT);
}
static struct page **pcpu_chunk_pagep(struct pcpu_chunk *chunk,
unsigned int cpu, int page_idx)
{
return &chunk->page[pcpu_page_idx(cpu, page_idx)];
}
static bool pcpu_chunk_page_occupied(struct pcpu_chunk *chunk,
int page_idx)
{
@ -583,6 +583,45 @@ static void pcpu_unmap(struct pcpu_chunk *chunk, int page_start, int page_end,
pcpu_chunk_addr(chunk, last, page_end));
}
static int __pcpu_map_pages(unsigned long addr, struct page **pages,
int nr_pages)
{
return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT,
PAGE_KERNEL, pages);
}
/**
* pcpu_map - map pages into a pcpu_chunk
* @chunk: chunk of interest
* @page_start: page index of the first page to map
* @page_end: page index of the last page to map + 1
*
* For each cpu, map pages [@page_start,@page_end) into @chunk.
* vcache is flushed afterwards.
*/
static int pcpu_map(struct pcpu_chunk *chunk, int page_start, int page_end)
{
unsigned int last = num_possible_cpus() - 1;
unsigned int cpu;
int err;
/* map must not be done on immutable chunk */
WARN_ON(chunk->immutable);
for_each_possible_cpu(cpu) {
err = __pcpu_map_pages(pcpu_chunk_addr(chunk, cpu, page_start),
pcpu_chunk_pagep(chunk, cpu, page_start),
page_end - page_start);
if (err < 0)
return err;
}
/* flush at once, please read comments in pcpu_unmap() */
flush_cache_vmap(pcpu_chunk_addr(chunk, 0, page_start),
pcpu_chunk_addr(chunk, last, page_end));
return 0;
}
/**
* pcpu_depopulate_chunk - depopulate and unmap an area of a pcpu_chunk
* @chunk: chunk to depopulate
@ -632,45 +671,6 @@ static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size,
pcpu_unmap(chunk, unmap_start, unmap_end, flush);
}
static int __pcpu_map_pages(unsigned long addr, struct page **pages,
int nr_pages)
{
return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT,
PAGE_KERNEL, pages);
}
/**
* pcpu_map - map pages into a pcpu_chunk
* @chunk: chunk of interest
* @page_start: page index of the first page to map
* @page_end: page index of the last page to map + 1
*
* For each cpu, map pages [@page_start,@page_end) into @chunk.
* vcache is flushed afterwards.
*/
static int pcpu_map(struct pcpu_chunk *chunk, int page_start, int page_end)
{
unsigned int last = num_possible_cpus() - 1;
unsigned int cpu;
int err;
/* map must not be done on immutable chunk */
WARN_ON(chunk->immutable);
for_each_possible_cpu(cpu) {
err = __pcpu_map_pages(pcpu_chunk_addr(chunk, cpu, page_start),
pcpu_chunk_pagep(chunk, cpu, page_start),
page_end - page_start);
if (err < 0)
return err;
}
/* flush at once, please read comments in pcpu_unmap() */
flush_cache_vmap(pcpu_chunk_addr(chunk, 0, page_start),
pcpu_chunk_addr(chunk, last, page_end));
return 0;
}
/**
* pcpu_populate_chunk - populate and map an area of a pcpu_chunk
* @chunk: chunk of interest