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linux-sg2042
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dma-mapping: use 'bitmap_zalloc()' when applicable 

'dma_mem->bitmap' is a bitmap. So use 'bitmap_zalloc()' to simplify code,
improve the semantic and avoid some open-coded arithmetic in allocator
arguments.

Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
consistency.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christophe JAILLET 2021-10-24 19:40:23 +02:00 committed by Christoph Hellwig
parent 7d6db80b7d
commit 9fbd8dc19a
1 changed files with 2 additions and 3 deletions
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5
kernel/dma/coherent.c
View File

@ -40,7 +40,6 @@ static struct dma_coherent_mem *dma_init_coherent_memory(phys_addr_t phys_addr,
{
struct dma_coherent_mem *dma_mem;
int pages = size >> PAGE_SHIFT;
int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
void *mem_base;
if (!size)
@ -53,7 +52,7 @@ static struct dma_coherent_mem *dma_init_coherent_memory(phys_addr_t phys_addr,
dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
if (!dma_mem)
goto out_unmap_membase;
dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
dma_mem->bitmap = bitmap_zalloc(pages, GFP_KERNEL);
if (!dma_mem->bitmap)
goto out_free_dma_mem;
@ -81,7 +80,7 @@ static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
return;
memunmap(mem->virt_base);
kfree(mem->bitmap);
bitmap_free(mem->bitmap);
kfree(mem);
}