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-rw-r--r--mm/cma.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/mm/cma.c b/mm/cma.c
index 8e9ec13d31db..5c96d7a3ba9c 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -63,6 +63,17 @@ static unsigned long cma_bitmap_aligned_mask(struct cma *cma, int align_order)
return (1UL << (align_order - cma->order_per_bit)) - 1;
}
+static unsigned long cma_bitmap_aligned_offset(struct cma *cma, int align_order)
+{
+ unsigned int alignment;
+
+ if (align_order <= cma->order_per_bit)
+ return 0;
+ alignment = 1UL << (align_order - cma->order_per_bit);
+ return ALIGN(cma->base_pfn, alignment) -
+ (cma->base_pfn >> cma->order_per_bit);
+}
+
static unsigned long cma_bitmap_maxno(struct cma *cma)
{
return cma->count >> cma->order_per_bit;
@@ -340,7 +351,7 @@ err:
*/
struct page *cma_alloc(struct cma *cma, int count, unsigned int align)
{
- unsigned long mask, pfn, start = 0;
+ unsigned long mask, offset, pfn, start = 0;
unsigned long bitmap_maxno, bitmap_no, bitmap_count;
struct page *page = NULL;
int ret;
@@ -355,13 +366,15 @@ struct page *cma_alloc(struct cma *cma, int count, unsigned int align)
return NULL;
mask = cma_bitmap_aligned_mask(cma, align);
+ offset = cma_bitmap_aligned_offset(cma, align);
bitmap_maxno = cma_bitmap_maxno(cma);
bitmap_count = cma_bitmap_pages_to_bits(cma, count);
for (;;) {
mutex_lock(&cma->lock);
- bitmap_no = bitmap_find_next_zero_area(cma->bitmap,
- bitmap_maxno, start, bitmap_count, mask);
+ bitmap_no = bitmap_find_next_zero_area_off(cma->bitmap,
+ bitmap_maxno, start, bitmap_count, mask,
+ offset);
if (bitmap_no >= bitmap_maxno) {
mutex_unlock(&cma->lock);
break;