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Commit 3e24aa58 authored by Tejun Heo's avatar Tejun Heo
Browse files

percpu: add an indirection ptr for chunk page map access 



Impact: allow sharing page map, no functional difference yet

Make chunk->page access indirect by adding a pointer and renaming the
actual array to page_ar.  This will be used by future changes.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 9a4f8a87

mm/percpu.c

+4 −1
Original line number Diff line number Diff line
@@ -80,7 +80,8 @@ struct pcpu_chunk { 
	int			map_alloc;	/* # of map entries allocated */

	int			*map;		/* allocation map */

	bool			immutable;	/* no [de]population allowed */

	struct page		*page[];	/* #cpus * UNIT_PAGES */

	struct page		**page;		/* points to page array */

	struct page		*page_ar[];	/* #cpus * UNIT_PAGES */

};



static int pcpu_unit_pages __read_mostly;
@@ -696,6 +697,7 @@ static struct pcpu_chunk *alloc_pcpu_chunk(void) 
				  PCPU_DFL_MAP_ALLOC * sizeof(chunk->map[0]));

	chunk->map_alloc = PCPU_DFL_MAP_ALLOC;

	chunk->map[chunk->map_used++] = pcpu_unit_size;

	chunk->page = chunk->page_ar;



	chunk->vm = get_vm_area(pcpu_chunk_size, GFP_KERNEL);

	if (!chunk->vm) {
@@ -918,6 +920,7 @@ size_t __init pcpu_setup_first_chunk(pcpu_get_page_fn_t get_page_fn, 
	schunk->vm = &first_vm;

	schunk->map = smap;

	schunk->map_alloc = ARRAY_SIZE(smap);

	schunk->page = schunk->page_ar;

	schunk->free_size = dyn_size;

	schunk->contig_hint = schunk->free_size;