[PATCH v4 5/8] mm: cma: Export cma_alloc(), cma_release() and cma_get_name()

Maxime Ripard
2026-03-31T10:00:36Z

The CMA dma-buf heap uses cma_alloc() and cma_release() to allocate and
free, respectively, its CMA buffers, and cma_get_name() to get the name
of the heap instance it's going to create.

However, these functions are not exported. Since we want to turn the CMA
heap into a module, let's export them both.

Reviewed-by: T.J. Mercier <tjmercier@google.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
mm/cma.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/mm/cma.c b/mm/cma.c
index 94b5da468a7d719e5144d33b06bcc7619c0fbcc9..550effb9c4e01cc488b5744fe61d55a5b70a6d6c 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -50,10 +50,11 @@ unsigned long cma_get_size(const struct cma *cma)

const char *cma_get_name(const struct cma *cma)
{
return cma->name;
}
+EXPORT_SYMBOL_GPL(cma_get_name);

static unsigned long cma_bitmap_aligned_mask(const struct cma *cma,
unsigned int align_order)
{
if (align_order <= cma->order_per_bit)
@@ -949,10 +950,11 @@ struct page *cma_alloc(struct cma *cma, unsigned long count,
if (page)
set_pages_refcounted(page, count);

return page;
}
+EXPORT_SYMBOL_GPL(cma_alloc);

static struct cma_memrange *find_cma_memrange(struct cma *cma,
const struct page *pages, unsigned long count)
{
struct cma_memrange *cmr = NULL;
@@ -1025,10 +1027,11 @@ bool cma_release(struct cma *cma, const struct page *pages,

__cma_release_frozen(cma, cmr, pages, count);

return true;
}
+EXPORT_SYMBOL_GPL(cma_release);

bool cma_release_frozen(struct cma *cma, const struct page *pages,
unsigned long count)
{
struct cma_memrange *cmr;

--
2.53.0