Re: [RESEND][PATCH v8 4/5] dma-buf: heaps: Add CMA heap to dmabuf heaps

On Fri, 6 Sep 2019 18:47:09 +0000 John Stultz wrote:

• cma_pages = cma_alloc(cma_heap->cma, nr_pages, align, false);
• if (!cma_pages)

• goto free_buf;
  

• if (PageHighMem(cma_pages)) {

• unsigned long nr_clear_pages = nr_pages;
  

• struct page *page = cma_pages;
  

• while (nr_clear_pages > 0) {
  

• 	void *vaddr = kmap_atomic(page);
  

• 	memset(vaddr, 0, PAGE_SIZE);
  

• 	kunmap_atomic(vaddr);
  

• 	page++;
  

• 	nr_clear_pages--;
  

• }
  

• } else {

• memset(page_address(cma_pages), 0, size);
  

• }

Take a breath after zeroing a page, and a peep at pending signal.