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From: Florian Fainelli <f.fainelli@gmail.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Doug Berger <opendmb@gmail.com>, Arnd Bergmann <arnd@arndb.de>,
	sboyd@kernel.org, Kevin Cernekee <cernekee@gmail.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	rmk+kernel@armlinux.org.uk,
	Florian Fainelli <f.fainelli@gmail.com>,
	Gregory Fong <gregory.0xf0@gmail.com>
Subject: [PATCH 2/2] ARM: Allow either FLATMEM or SPARSEMEM on the multiplatform build
Date: Wed,  6 May 2020 16:50:09 -0700	[thread overview]
Message-ID: <20200506235009.25023-3-f.fainelli@gmail.com> (raw)
In-Reply-To: <20200506235009.25023-1-f.fainelli@gmail.com>

From: Gregory Fong <gregory.0xf0@gmail.com>

ARMv7 chips with LPAE can often benefit from SPARSEMEM, as portions of
system memory can be located deep in the 36-bit address space.  Allow
FLATMEM or SPARSEMEM to be selectable at compile time; FLATMEM remains
the default.

This is based on Kevin's "[PATCH 3/3] ARM: Allow either FLATMEM or
SPARSEMEM on the multi-v7 build" from [1] and shamelessly rips off his
commit message text above.  As Arnd pointed out at [2] there doesn't
seem to be any reason to tie this specifically to ARMv7, so this has
been changed to apply to all multiplatform kernels.

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/286837.html
[2] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/298950.html

Cc: Kevin Cernekee <cernekee@gmail.com>
Tested-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Doug Berger <opendmb@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 arch/arm/Kconfig | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 5986277296c3..7bb5264a9c3a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -312,6 +312,8 @@ choice
 config ARCH_MULTIPLATFORM
 	bool "Allow multiple platforms to be selected"
 	depends on MMU
+	select ARCH_FLATMEM_ENABLE
+	select ARCH_SPARSEMEM_ENABLE
 	select ARM_HAS_SG_CHAIN
 	select ARM_PATCH_PHYS_VIRT
 	select AUTO_ZRELADDR
@@ -1515,6 +1517,9 @@ config OABI_COMPAT
 config ARCH_HAS_HOLES_MEMORYMODEL
 	bool
 
+config ARCH_FLATMEM_ENABLE
+	bool
+
 config ARCH_SPARSEMEM_ENABLE
 	bool
 
-- 
2.17.1


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  parent reply	other threads:[~2020-05-06 23:52 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-06 23:50 [PATCH 0/2] Allow either FLATMEM or SPARSEMEM on the multiplatform build Florian Fainelli
2020-05-06 23:50 ` [PATCH 1/2] ARM: Remove redundant ARCH_SPARSEMEM_DEFAULT setting Florian Fainelli
2020-05-07  7:27   ` Mike Rapoport
2020-05-07 10:30   ` Russell King - ARM Linux admin
2020-05-07 17:25     ` Florian Fainelli
2020-05-07 18:50       ` Russell King - ARM Linux admin
2020-05-07 19:38         ` Florian Fainelli
2020-05-07 20:08     ` [PATCH] arm: use SPARSMEM_STATIC when SPARSEMEM is enabled (Was: [PATCH 1/2] ARM: Remove redundant ARCH_SPARSEMEM_DEFAULT setting) Mike Rapoport
2020-05-08 20:20       ` Florian Fainelli
2020-05-07 20:29     ` [PATCH 1/2] ARM: Remove redundant ARCH_SPARSEMEM_DEFAULT setting Mike Rapoport
2020-05-07 20:47       ` Florian Fainelli
2020-05-08 21:41         ` Mike Rapoport
2020-05-08 21:45           ` Florian Fainelli
2020-05-06 23:50 ` Florian Fainelli [this message]
2020-05-07  7:27   ` [PATCH 2/2] ARM: Allow either FLATMEM or SPARSEMEM on the multiplatform build Mike Rapoport
2020-05-07 20:11     ` Florian Fainelli
2020-05-18 15:58       ` Florian Fainelli
2020-05-18 19:45         ` Mike Rapoport
2020-05-19  7:59           ` Arnd Bergmann
2020-05-19 14:43             ` Mike Rapoport
2020-05-19 15:04               ` Russell King - ARM Linux admin
2020-05-19 15:27                 ` Mike Rapoport
2020-05-19 15:32                   ` Arnd Bergmann
2020-05-19 16:54                     ` Russell King - ARM Linux admin
2020-05-19 17:59                       ` Mike Rapoport
2020-05-19 20:42                       ` Arnd Bergmann
2020-05-21  2:45                         ` Florian Fainelli
2020-05-21  7:47                           ` Arnd Bergmann
2020-05-07  8:14 ` [PATCH 0/2] " Russell King - ARM Linux admin
2020-05-07 10:09   ` Mike Rapoport
2020-05-21  8:18 [PATCH 0/2] ARM: " Mike Rapoport
2020-05-21  8:18 ` [PATCH 2/2] " Mike Rapoport

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