Re: Regression in 543cea9a - was: Re: Kernel problem on rx2800 i2

[Christoph Hellwig <hch@lst.de>]

On Tue, Jun 25, 2019 at 08:54:11AM +0200, John Paul Adrian Glaubitz wrote:
> Okay, thanks. I'll whip up a patch for Frank to test.

The one below should do it, but from looking at the ia64 zone
initialization I'm not sure this will be the culprit.

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 2c2772e9702a..3e802f4580b3 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -82,9 +82,7 @@ static gfp_t __dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
 	 */
 	if (*phys_mask <= DMA_BIT_MASK(ARCH_ZONE_DMA_BITS))
 		return GFP_DMA;
-	if (*phys_mask <= DMA_BIT_MASK(32))
-		return GFP_DMA32;
-	return 0;
+	return GFP_DMA32;
 }
 
 static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)