Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-10 06:01:57 +00:00
Code Issues Packages Projects Releases Wiki Activity

dma-direct: optimize page freeing when it is not addressable

Browse Source 
When the CMA allocation succeeds but isn't addressable, its buffer has
already been released and the page is set to NULL.  So later when the
normal page allocation succeeds but isn't addressable, __free_pages()
can be used to free that normal page rather than using
dma_free_contiguous that does extra checks that are not needed.

Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Chen Yu 2024-08-31 19:01:19 +08:00 committed by Christoph Hellwig
parent de6c85bf91
commit f689a3ab7b
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/dma/direct.c
View File

@ -140,7 +140,7 @@ again:
if (!page)
page = alloc_pages_node(node, gfp, get_order(size));
if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
dma_free_contiguous(dev, page, size);
__free_pages(page, get_order(size));
page = NULL;
if (IS_ENABLED(CONFIG_ZONE_DMA32) &&