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This patch will use the default cma region when the device's specified CMA is not enough. Signed-off-by: He Zhai --- kernel/dma/contiguous.c | 11 +++++++++-- mm/cma.c | 2 +- 2 files changed, 10 insertions(+), 3 deletions(-) diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c index 055da410ac71..e45cfb24500f 100644 --- a/kernel/dma/contiguous.c +++ b/kernel/dma/contiguous.c @@ -357,8 +357,13 @@ struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp) /* CMA can be used only in the context which permits sleeping */ if (!gfpflags_allow_blocking(gfp)) return NULL; - if (dev->cma_area) - return cma_alloc_aligned(dev->cma_area, size, gfp); + if (dev->cma_area) { + struct page *page = NULL; + + page = cma_alloc_aligned(dev->cma_area, size, gfp); + if (page) + return page; + } if (size <= PAGE_SIZE) return NULL; @@ -406,6 +411,8 @@ void dma_free_contiguous(struct device *dev, struct page *page, size_t size) if (dev->cma_area) { if (cma_release(dev->cma_area, page, count)) return; + if (cma_release(dma_contiguous_default_area, page, count)) + return; } else { /* * otherwise, page is from either per-numa cma or default cma diff --git a/mm/cma.c b/mm/cma.c index 3e9724716bad..f225b3f65bd2 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -495,7 +495,7 @@ struct page *cma_alloc(struct cma *cma, unsigned long count, } if (ret && !no_warn) { - pr_err_ratelimited("%s: %s: alloc failed, req-size: %lu pages, ret: %d\n", + pr_debug("%s: %s: alloc failed, req-size: %lu pages, ret: %d, try to use default cma\n", __func__, cma->name, count, ret); cma_debug_show_areas(cma); } -- 2.34.1