linux-kernel - [PATCH RFC/RFT 2/5] dma-remap: Run alloc

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Date:   Tue, 26 Mar 2019 15:49:56 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     hch@....de, robin.murphy@....com
Cc:     vdumpa@...dia.com, linux@...linux.org.uk, catalin.marinas@....com,
        will.deacon@....com, joro@...tes.org, m.szyprowski@...sung.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, tony@...mide.com
Subject: [PATCH RFC/RFT 2/5] dma-remap: Run alloc_pages() on failure

The CMA allocation will skip allocations of single pages to save CMA
resource. This requires its callers to rebound those page allocations
from normal area.

So this patch moves the alloc_pages() call to the fallback routines.

Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
---
 kernel/dma/remap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/dma/remap.c b/kernel/dma/remap.c
index 2b750f13bc8f..daab2f3186a2 100644
--- a/kernel/dma/remap.c
+++ b/kernel/dma/remap.c
@@ -116,7 +116,7 @@ int __init dma_atomic_pool_init(gfp_t gfp, pgprot_t prot)
 	if (dev_get_cma_area(NULL))
 		page = dma_alloc_from_contiguous(NULL, nr_pages,
 						 pool_size_order, false);
-	else
+	if (!page)
 		page = alloc_pages(gfp, pool_size_order);
 	if (!page)
 		goto out;
-- 
2.17.1