linux-kernel - [PATCH v1] x86/Kconfig: select ARCH_SELECT_MEMORY_MODEL only if FLATMEM and SPARSEMEM are possible

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Date:   Wed, 29 Sep 2021 16:43:21 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     David Hildenbrand <david@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-mm@...ck.org
Subject: [PATCH v1] x86/Kconfig: select ARCH_SELECT_MEMORY_MODEL only if FLATMEM and SPARSEMEM are possible

On x86-64 we really only support CONFIG_SPARSEMEM; there is nothing users
can select. So enable the memory model selection (via
CONFIG_ARCH_SELECT_MEMORY_MODEL) only if both, SPARSEMEM and FLATMEM are
possible, which isn't the case on x86-64.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: linux-mm@...ck.org
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 arch/x86/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ab83c22d274e..50f98dc02ad4 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1611,7 +1611,7 @@ config ARCH_SPARSEMEM_DEFAULT
 
 config ARCH_SELECT_MEMORY_MODEL
 	def_bool y
-	depends on ARCH_SPARSEMEM_ENABLE
+	depends on ARCH_SPARSEMEM_ENABLE && ARCH_FLATMEM_ENABLE
 
 config ARCH_MEMORY_PROBE
 	bool "Enable sysfs memory/probe interface"
-- 
2.31.1