From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-mm@kvack.org, akpm@linux-foundation.org
Cc: Anshuman Khandual <anshuman.khandual@arm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, linux-s390@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH V2] mm/thp: Make ARCH_ENABLE_SPLIT_PMD_PTLOCK dependent on PGTABLE_LEVELS > 2
Date: Wed, 26 May 2021 12:48:21 +0530 [thread overview]
Message-ID: <1622013501-20409-1-git-send-email-anshuman.khandual@arm.com> (raw)
ARCH_ENABLE_SPLIT_PMD_PTLOCK is irrelevant unless there are more than two
page table levels including PMD (also per
Documentation/vm/split_page_table_lock.rst). Make this dependency explicit
on remaining platforms i.e x86 and s390 where ARCH_ENABLE_SPLIT_PMD_PTLOCK
is subscribed.
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: x86@kernel.org
Cc: linux-s390@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com> # s390
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
Changes in V2:
- Updated the commit message per Gerald
Changes in V1:
https://lore.kernel.org/linux-mm/1620621345-29176-1-git-send-email-anshuman.khandual@arm.com/
arch/s390/Kconfig | 2 +-
arch/x86/Kconfig | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index b4c7c34069f8..fcc1ea339a9d 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -62,7 +62,7 @@ config S390
select ARCH_BINFMT_ELF_STATE
select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
select ARCH_ENABLE_MEMORY_HOTREMOVE
- select ARCH_ENABLE_SPLIT_PMD_PTLOCK
+ select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
select ARCH_HAS_DEBUG_VM_PGTABLE
select ARCH_HAS_DEBUG_WX
select ARCH_HAS_DEVMEM_IS_ALLOWED
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0045e1b44190..ec9e9d3d7e3f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -63,7 +63,7 @@ config X86
select ARCH_ENABLE_HUGEPAGE_MIGRATION if X86_64 && HUGETLB_PAGE && MIGRATION
select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64 || (X86_32 && HIGHMEM)
select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG
- select ARCH_ENABLE_SPLIT_PMD_PTLOCK if X86_64 || X86_PAE
+ select ARCH_ENABLE_SPLIT_PMD_PTLOCK if (PGTABLE_LEVELS > 2) && (X86_64 || X86_PAE)
select ARCH_ENABLE_THP_MIGRATION if X86_64 && TRANSPARENT_HUGEPAGE
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_CACHE_LINE_SIZE
--
2.20.1
reply other threads:[~2021-05-26 7:17 UTC|newest]
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