[PATCH V2 1/6] mm: Generalize ARCH_HAS_CACHE_LINE_SIZE

[Anshuman Khandual]

ARCH_HAS_CACHE_LINE_SIZE config has duplicate definitions on platforms that
subscribe it. Instead, just make it a generic option which can be selected
on applicable platforms. This change reduces code duplication and makes it
cleaner.

Cc: Vineet Gupta <vgupta at synopsys.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: Borislav Petkov <bp at alien8.de>
Cc: "H. Peter Anvin" <hpa at zytor.com>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: x86 at kernel.org
Cc: linux-snps-arc at lists.infradead.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-mm at kvack.org
Cc: linux-kernel at vger.kernel.org
Acked-by: Catalin Marinas <catalin.marinas at arm.com> (arm64)
Signed-off-by: Anshuman Khandual <anshuman.khandual at arm.com>
---
 arch/arc/Kconfig   | 4 +---
 arch/arm64/Kconfig | 4 +---
 arch/x86/Kconfig   | 4 +---
 mm/Kconfig         | 3 +++
 4 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index bc8d6aecfbbd..fab05f7189c0 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -6,6 +6,7 @@
 config ARC
 	def_bool y
 	select ARC_TIMERS
+	select ARCH_HAS_CACHE_LINE_SIZE
 	select ARCH_HAS_DEBUG_VM_PGTABLE
 	select ARCH_HAS_DMA_PREP_COHERENT
 	select ARCH_HAS_PTE_SPECIAL
@@ -48,9 +49,6 @@ config ARC
 	select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32
 	select SET_FS
 
-config ARCH_HAS_CACHE_LINE_SIZE
-	def_bool y
-
 config TRACE_IRQFLAGS_SUPPORT
 	def_bool y
 
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e4e1b6550115..75a1af6cef9e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -11,6 +11,7 @@ config ARM64
 	select ACPI_PPTT if ACPI
 	select ARCH_HAS_DEBUG_WX
 	select ARCH_BINFMT_ELF_STATE
+	select ARCH_HAS_CACHE_LINE_SIZE
 	select ARCH_HAS_DEBUG_VIRTUAL
 	select ARCH_HAS_DEBUG_VM_PGTABLE
 	select ARCH_HAS_DMA_PREP_COHERENT
@@ -1065,9 +1066,6 @@ config HW_PERF_EVENTS
 config SYS_SUPPORTS_HUGETLBFS
 	def_bool y
 
-config ARCH_HAS_CACHE_LINE_SIZE
-	def_bool y
-
 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 	def_bool y if PGTABLE_LEVELS > 2
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2792879d398e..51d171abb57a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -61,6 +61,7 @@ config X86
 	select ARCH_32BIT_OFF_T			if X86_32
 	select ARCH_CLOCKSOURCE_INIT
 	select ARCH_HAS_ACPI_TABLE_UPGRADE	if ACPI
+	select ARCH_HAS_CACHE_LINE_SIZE
 	select ARCH_HAS_DEBUG_VIRTUAL
 	select ARCH_HAS_DEBUG_VM_PGTABLE	if !X86_PAE
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
@@ -313,9 +314,6 @@ config GENERIC_CALIBRATE_DELAY
 config ARCH_HAS_CPU_RELAX
 	def_bool y
 
-config ARCH_HAS_CACHE_LINE_SIZE
-	def_bool y
-
 config ARCH_HAS_FILTER_PGPROT
 	def_bool y
 
diff --git a/mm/Kconfig b/mm/Kconfig
index 24c045b24b95..1c9a37fc651a 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -760,6 +760,9 @@ config IDLE_PAGE_TRACKING
 	  See Documentation/admin-guide/mm/idle_page_tracking.rst for
 	  more details.
 
+config ARCH_HAS_CACHE_LINE_SIZE
+	bool
+
 config ARCH_HAS_PTE_DEVMAP
 	bool
 
-- 
2.20.1