dma-direct check for highmem pages in dma_direct_alloc_pages (08a89c28) · Commits · 戴 / test

kernel/dma/direct.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -309,6 +309,17 @@ struct page dma_direct_alloc_pages(struct device dev, size_t size,
		page = __dma_direct_alloc_pages(dev, size, gfp);
		if (!page)
		return NULL;
		if (PageHighMem(page)) {
		/*
		* Depending on the cma= arguments and per-arch setup
		* dma_alloc_contiguous could return highmem pages.
		* Without remapping there is no way to return them here,
		* so log an error and fail.
		*/
		dev_info(dev, "Rejecting highmem page from CMA.\n");
		goto out_free_pages;
		}

		ret = page_address(page);
		if (force_dma_unencrypted(dev)) {
		if (set_memory_decrypted((unsigned long)ret,