[PATCH 0/2] ARM: Allow either FLATMEM or SPARSEMEM on the multiplatform build

From: Mike Rapoport <rppt@linux.ibm.com>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>, Stephen Boyd <sboyd@kernel.org>,
	Kevin Cernekee <cernekee@gmail.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Doug Berger <opendmb@gmail.com>,
	Gregory Fong <gregory.0xf0@gmail.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/2] ARM: Allow either FLATMEM or SPARSEMEM on the multiplatform build
Date: Thu, 21 May 2020 11:18:23 +0300	[thread overview]
Message-ID: <20200521081825.1348844-1-rppt@linux.ibm.com> (raw)

(resendig for the correct address and with mailing list cc'ed, sorry for
the noise)

Hi,

Following the discussion at [1], I'm resending the patches that enable
memory model selection in menuconfig and such.

These patches do not change the way the configuration is generated from the
defconfigs and they do not change explicit selection of SPARSEMEM for
platforms that have "select ARCH_ENABLE_SPARSEMEM".

The mere change is that when a user runs an interactive configuration they
will be allowed to select between FLATMEM and SPARSMEM, which is not the
case today.

There is indeed some awkwardness in, e.g. removal of
ARCH_SPARSEMEM_DEFAULT, but this is what memory model selection logic in
mm/Kconfig imposes.

For example, below is the diffs of the configurations generated with
'make rpc_defconfig' and 'make defconfig':

$ diff -s old/rpc_defconfig new/rpc_defconfig
Files old/rpc_defconfig and new/rpc_defconfig are identical

$ diff -u old/defconfig new/defconfig

--- old/defconfig	2020-05-20 17:51:01.832649705 +0300
+++ new/defconfig	2020-05-20 18:15:21.084385880 +0300
@@ -674,6 +674,9 @@
 CONFIG_AEABI=y
 # CONFIG_OABI_COMPAT is not set
 CONFIG_ARCH_HAS_HOLES_MEMORYMODEL=y
+CONFIG_ARCH_SELECT_MEMORY_MODEL=y
+CONFIG_ARCH_FLATMEM_ENABLE=y
+CONFIG_ARCH_SPARSEMEM_ENABLE=y
 CONFIG_HAVE_ARCH_PFN_VALID=y
 CONFIG_HIGHMEM=y
 CONFIG_HIGHPTE=y
@@ -1061,6 +1064,9 @@
 #
 # Memory Management options
 #
+CONFIG_SELECT_MEMORY_MODEL=y
+CONFIG_FLATMEM_MANUAL=y
+# CONFIG_SPARSEMEM_MANUAL is not set
 CONFIG_FLATMEM=y
 CONFIG_FLAT_NODE_MEM_MAP=y
 CONFIG_ARCH_KEEP_MEMBLOCK=y

[1] https://lore.kernel.org/linux-arm-kernel/20200506235009.25023-1-f.fainelli@gmail.com

Gregory Fong (1):
  ARM: Allow either FLATMEM or SPARSEMEM on the multiplatform build

Kevin Cernekee (1):
  ARM: Remove redundant ARCH_SPARSEMEM_DEFAULT setting

 arch/arm/Kconfig | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

-- 
2.26.2


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
