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cma: Introduce cma_for_each_area 

Frameworks (e.g. Ion) may want to iterate over each possible CMA area to
allow for enumeration. Introduce a function to allow a callback.

Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Laura Abbott 2017-04-18 11:27:04 -07:00 committed by Greg Kroah-Hartman
parent f318dd083c
commit e4231bcda7
2 changed files with 16 additions and 0 deletions
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2
include/linux/cma.h
View File

@ -34,4 +34,6 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align, extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
gfp_t gfp_mask); gfp_t gfp_mask);
extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count); extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
#endif #endif

14
mm/cma.c
View File

@ -504,3 +504,17 @@ bool cma_release(struct cma *cma, const struct page *pages, unsigned int count)
return true; return true;
} }
int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data)
{
int i;
for (i = 0; i < cma_area_count; i++) {
int ret = it(&cma_areas[i], data);
if (ret)
return ret;
}
return 0;
}