From: Mike Rapoport <rppt@kernel.org>
To: linux-sh@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
Mike Rapoport <rppt@kernel.org>, Rich Felker <dalias@libc.org>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH 00/10] sh: remove NUMA and SPARSEMEM support
Date: Mon, 13 Apr 2026 13:46:38 +0300 [thread overview]
Message-ID: <20260413104649.852228-1-rppt@kernel.org> (raw)
From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
Hi,
NUMA support for SuperH was introduced a long time ago by commit
b241cb0c885e ("sh: Support for multiple nodes.")
"... for boards with many different memory blocks that are
otherwise unused (SH7722/SH7785 URAM and so forth)"
In reality, this added 128K of memory on sh7722 and sh7785 and 256K on
shx3 at the expense of all the NUMA related code in the kernel.
For build of v7.0-rc7 with defconfig and the same configuration with
CONFIG_NUMA disabled, bloat-o-meter reports difference of ~76k. Disabling
CONFIG_SPARSMEM on top increases the difference to ~94k. And that's only
overhead in code and static data that does not take into the account data
structures allocated at run time.
And all this overhead has been there for nothing for almost 8 years
because since commit ac21fc2dcb40 ("sh: switch to NO_BOOTMEM")
those additional "nodes" could not be used by the core MM because the
maximal pfn for ZONE_NORMAL was cut out at the end of the normal memory.
Mike Rapoport (Microsoft) (10):
sh: remove CONFIG_NUMA and realted configuration options
sh: mm: remove numa.c
sh: mm: drop allocate_pgdat()
sh: remove setup_bootmem_node() and plat_mem_setup()
sh: drop dead code guarded by #ifdef CONFIG_NUMA
sh: drop include/asm/mmzone.h
init/Kconfig: drop ARCH_WANT_NUMA_VARIABLE_LOCALITY
sh: init: remove call the memblock_set_node()
sh: remove SPARSEMEM related entries from Kconfig
sh: drop include/asm/sparsemem.h
arch/sh/Kconfig | 8 ----
arch/sh/configs/migor_defconfig | 1 -
arch/sh/configs/sdk7786_defconfig | 1 -
arch/sh/configs/se7722_defconfig | 1 -
arch/sh/configs/shx3_defconfig | 1 -
arch/sh/configs/ul2_defconfig | 1 -
arch/sh/include/asm/mmu.h | 2 +
arch/sh/include/asm/mmzone.h | 42 --------------------
arch/sh/include/asm/setup.h | 3 ++
arch/sh/include/asm/sparsemem.h | 12 ------
arch/sh/include/asm/topology.h | 13 -------
arch/sh/kernel/cpu/sh4a/setup-sh7366.c | 5 ---
arch/sh/kernel/cpu/sh4a/setup-sh7722.c | 7 ----
arch/sh/kernel/cpu/sh4a/setup-sh7723.c | 1 -
arch/sh/kernel/cpu/sh4a/setup-sh7724.c | 1 -
arch/sh/kernel/cpu/sh4a/setup-sh7757.c | 5 ---
arch/sh/kernel/cpu/sh4a/setup-sh7785.c | 7 ----
arch/sh/kernel/cpu/sh4a/setup-sh7786.c | 5 ---
arch/sh/kernel/cpu/sh4a/setup-shx3.c | 18 ---------
arch/sh/kernel/setup.c | 7 ----
arch/sh/kernel/topology.c | 12 ------
arch/sh/kernel/vmcore_info.c | 4 --
arch/sh/mm/Kconfig | 29 --------------
arch/sh/mm/Makefile | 1 -
arch/sh/mm/init.c | 24 ------------
arch/sh/mm/numa.c | 53 --------------------------
arch/sh/mm/sram.c | 3 +-
init/Kconfig | 7 ----
28 files changed, 6 insertions(+), 268 deletions(-)
delete mode 100644 arch/sh/include/asm/mmzone.h
delete mode 100644 arch/sh/include/asm/sparsemem.h
delete mode 100644 arch/sh/mm/numa.c
base-commit: 591cd656a1bf5ea94a222af5ef2ee76df029c1d2
--
2.53.0
next reply other threads:[~2026-04-13 10:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-13 10:46 Mike Rapoport [this message]
2026-04-13 10:46 ` [PATCH 01/10] sh: remove CONFIG_NUMA and realted configuration options Mike Rapoport
2026-04-13 10:46 ` [PATCH 02/10] sh: mm: remove numa.c Mike Rapoport
2026-04-13 10:46 ` [PATCH 03/10] sh: mm: drop allocate_pgdat() Mike Rapoport
2026-04-13 10:46 ` [PATCH 04/10] sh: remove setup_bootmem_node() and plat_mem_setup() Mike Rapoport
2026-04-13 10:46 ` [PATCH 05/10] sh: drop dead code guarded by #ifdef CONFIG_NUMA Mike Rapoport
2026-04-13 10:46 ` [PATCH 06/10] sh: drop include/asm/mmzone.h Mike Rapoport
2026-04-13 10:46 ` [PATCH 07/10] init/Kconfig: drop ARCH_WANT_NUMA_VARIABLE_LOCALITY Mike Rapoport
2026-04-13 10:46 ` [PATCH 08/10] sh: init: remove call the memblock_set_node() Mike Rapoport
2026-04-13 10:46 ` [PATCH 09/10] sh: remove SPARSEMEM related entries from Kconfig Mike Rapoport
2026-04-13 10:46 ` [PATCH 10/10] sh: drop include/asm/sparsemem.h Mike Rapoport
2026-04-13 10:57 ` [PATCH 00/10] sh: remove NUMA and SPARSEMEM support John Paul Adrian Glaubitz
2026-04-13 11:10 ` Mike Rapoport
2026-04-13 11:14 ` Arnd Bergmann
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