linux-kernel - [PATCH 5.5 030/119] riscv: Force flat memory model with no-mmu

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Date:   Tue, 24 Mar 2020 14:10:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Damien Le Moal <damien.lemoal@....com>,
        Anup Patel <anup@...infault.org>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 030/119] riscv: Force flat memory model with no-mmu

From: Damien Le Moal <damien.lemoal@....com>

[ Upstream commit aa2734202acc506d09c8e641db4da161f902df27 ]

Compilation errors trigger if ARCH_SPARSEMEM_ENABLE is enabled for
a nommu kernel. Since the sparsemem model does not make sense anyway
for the nommu case, do not allow selecting this option to always use
the flatmem model.

Signed-off-by: Damien Le Moal <damien.lemoal@....com>
Reviewed-by: Anup Patel <anup@...infault.org>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/riscv/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index fa7dc03459e7f..1be11c23fa335 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -121,6 +121,7 @@ config ARCH_FLATMEM_ENABLE
 
 config ARCH_SPARSEMEM_ENABLE
 	def_bool y
+	depends on MMU
 	select SPARSEMEM_VMEMMAP_ENABLE
 
 config ARCH_SELECT_MEMORY_MODEL
-- 
2.20.1