Commit da60cab4 authored by Glauber Costa's avatar Glauber Costa Committed by Ingo Molnar

x86: return conditional to mmu

Just return our allocation if we don't have an mmu. For i386, where this patch
is being applied, we never have. So our goal is just to have the code to look like
x86_64's.
Signed-off-by: default avatarGlauber Costa <gcosta@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent aa99b16f
...@@ -116,12 +116,42 @@ void *dma_alloc_coherent(struct device *dev, size_t size, ...@@ -116,12 +116,42 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
gfp = (gfp & ~GFP_DMA32) | GFP_DMA; gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
goto again; goto again;
} }
/* Let low level make its own zone decisions */
gfp &= ~(GFP_DMA32|GFP_DMA);
if (dma_ops->alloc_coherent)
return dma_ops->alloc_coherent(dev, size,
dma_handle, gfp);
return NULL;
} }
memset(ret, 0, size); memset(ret, 0, size);
*dma_handle = bus; if (!mmu) {
*dma_handle = bus;
return ret;
}
}
if (dma_ops->alloc_coherent) {
free_pages((unsigned long)ret, get_order(size));
gfp &= ~(GFP_DMA|GFP_DMA32);
return dma_ops->alloc_coherent(dev, size, dma_handle, gfp);
}
if (dma_ops->map_simple) {
*dma_handle = dma_ops->map_simple(dev, virt_to_phys(ret),
size,
PCI_DMA_BIDIRECTIONAL);
if (*dma_handle != bad_dma_address)
return ret;
} }
return ret; if (panic_on_overflow)
panic("dma_alloc_coherent: IOMMU overflow by %lu bytes\n",
(unsigned long)size);
free_pages((unsigned long)ret, get_order(size));
return NULL;
} }
EXPORT_SYMBOL(dma_alloc_coherent); EXPORT_SYMBOL(dma_alloc_coherent);
......
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