[PATCH 02/19] alpha: define DPS root partition type UUID

[Vincent Mailhol <mailhol@kernel.org>]

DPS [1] assigns GPT partition type UUIDs to operating system partitions.
Root partitions use architecture-specific type UUIDs so the OS can
discover the intended root filesystem without relying on a root= cmdline
option.

Define DPS_ROOT_PARTITION_TYPE_UUID in asm/dps_root.h for alpha and
select ARCH_HAS_DPS_ROOT_PARTITION_TYPE_UUID.

[1] The Discoverable Partitions Specification (DPS)
Link: https://uapi-group.org/specifications/specs/discoverable_partitions_specification/

Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Magnus Lindholm <linmag7@gmail.com>
Cc: linux-alpha@vger.kernel.org
Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
---
 arch/alpha/Kconfig                | 1 +
 arch/alpha/include/asm/dps_root.h | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 7b7dafe7d9df..400cbb7525c8 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -5,6 +5,7 @@ config ALPHA
 	select ARCH_32BIT_USTAT_F_TINODE
 	select ARCH_HAS_CURRENT_STACK_POINTER
 	select ARCH_HAS_DMA_OPS if PCI
+	select ARCH_HAS_DPS_ROOT_PARTITION_TYPE_UUID
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select ARCH_MODULE_NEEDS_WEAK_PER_CPU if SMP
diff --git a/arch/alpha/include/asm/dps_root.h b/arch/alpha/include/asm/dps_root.h
new file mode 100644
index 000000000000..7f70a83f72de
--- /dev/null
+++ b/arch/alpha/include/asm/dps_root.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _ASM_ALPHA_DPS_ROOT_H
+#define _ASM_ALPHA_DPS_ROOT_H
+
+#define DPS_ROOT_PARTITION_TYPE_UUID "6523f8ae-3eb1-4e2a-a05a-18b695ae656f"
+
+#endif /* _ASM_ALPHA_DPS_ROOT_H */

-- 
2.53.0