[RFC PATCH 1/4] ACPI/Resource: Add memory prefetch check support

[Lan Tianyu]

This patch is to check mem address space's acpi resource caching ability
and set prefetch flag of struct resource if it's prefetchable.

Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 drivers/acpi/resource.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index b7201fc..929f416 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -202,6 +202,9 @@ bool acpi_dev_resource_address_space(struct acpi_resource *ares,
 		res->flags = acpi_dev_memresource_flags(len,
 						addr.info.mem.write_protect,
 						window);
+
+		if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
+			res->flags |= IORESOURCE_PREFETCH;
 		break;
 	case ACPI_IO_RANGE:
 		io_decode = addr.granularity == 0xfff ?
-- 
1.8.2.1

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