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x86,percpu: generalize lpage first chunk allocator

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Generalize and move x86 setup_pcpu_lpage() into
pcpu_lpage_first_chunk().  setup_pcpu_lpage() now is a simple wrapper
around the generalized version.  Other than taking size parameters and
using arch supplied callbacks to allocate/free/map memory,
pcpu_lpage_first_chunk() is identical to the original implementation.

This simplifies arch code and will help converting more archs to
dynamic percpu allocator.

While at it, factor out pcpu_calc_fc_sizes() which is common to
pcpu_embed_first_chunk() and pcpu_lpage_first_chunk().

[ Impact: code reorganization and generalization ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tejun Heo 2009-07-04 08:10:59 +09:00
parent 8f05a6a65d
commit 8c4bfc6e88
5 changed files with 244 additions and 171 deletions
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27
include/linux/percpu.h
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@ -62,6 +62,7 @@ typedef struct page * (*pcpu_get_page_fn_t)(unsigned int cpu, int pageno);
typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size);
typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
typedef void (*pcpu_fc_map_fn_t)(void *ptr, size_t size, void *addr);
extern size_t __init pcpu_setup_first_chunk(pcpu_get_page_fn_t get_page_fn,
size_t static_size, size_t reserved_size,
@ -79,6 +80,32 @@ extern ssize_t __init pcpu_4k_first_chunk(
pcpu_fc_free_fn_t free_fn,
pcpu_fc_populate_pte_fn_t populate_pte_fn);
#ifdef CONFIG_NEED_MULTIPLE_NODES
extern ssize_t __init pcpu_lpage_first_chunk(
size_t static_size, size_t reserved_size,
ssize_t dyn_size, size_t lpage_size,
pcpu_fc_alloc_fn_t alloc_fn,
pcpu_fc_free_fn_t free_fn,
pcpu_fc_map_fn_t map_fn);
extern void *pcpu_lpage_remapped(void *kaddr);
#else
static inline ssize_t __init pcpu_lpage_first_chunk(
size_t static_size, size_t reserved_size,
ssize_t dyn_size, size_t lpage_size,
pcpu_fc_alloc_fn_t alloc_fn,
pcpu_fc_free_fn_t free_fn,
pcpu_fc_map_fn_t map_fn)
{
return -EINVAL;
}
static inline void *pcpu_lpage_remapped(void *kaddr)
{
return NULL;
}
#endif
/*
* Use this to get to a cpu's version of the per-cpu object
* dynamically allocated. Non-atomic access to the current CPU's