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[Xen-devel] [PATCH V3] arm: xen: mm: use __GPF_DMA32 for arm64
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- From: Peng Fan <peng.fan@xxxxxxx>
- Date: Mon, 16 Sep 2019 09:51:33 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Peng Fan <peng.fan@xxxxxxx>, dl-linux-imx <linux-imx@xxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 16 Sep 2019 09:51:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH V3] arm: xen: mm: use __GPF_DMA32 for arm64
From: Peng Fan <peng.fan@xxxxxxx>
arm64 shares some code under arch/arm/xen, including mm.c.
However ZONE_DMA is removed by commit
ad67f5a6545("arm64: replace ZONE_DMA with ZONE_DMA32").
So add a check if CONFIG_ZONE_DMA32 is enabled use __GFP_DMA32.
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---
V3:
Use IS_ENABLED(CONFIG_ZONE_DMA32) and drop xen_set_gfp_dma.
V2:
Follow suggestion from Stefano,
introduce static inline void xen_set_gfp_dma(gfp_t *flags) for arm32/arm64, and
for arm64 using __GFP_DMA for the former and __GFP_DMA32 for the latter.
arch/arm/xen/mm.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index 2b2c208408bb..38fa917c8585 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -28,7 +28,10 @@ unsigned long xen_get_swiotlb_free_pages(unsigned int order)
for_each_memblock(memory, reg) {
if (reg->base < (phys_addr_t)0xffffffff) {
- flags |= __GFP_DMA;
+ if (IS_ENABLED(CONFIG_ZONE_DMA32))
+ flags |= __GFP_DMA32;
+ else
+ flags |= __GFP_DMA;
break;
}
}
--
2.16.4
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