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Subject[PATCH v10 1/2] arch/*: Add CONFIG_ARCH_HAVE_CMPXCHG64
Date
The next patch in this series introduces a call to cmpxchg64()
in the block layer core for those architectures on which this
functionality is available. Make it possible to test whether
cmpxchg64() is available by introducing CONFIG_ARCH_HAVE_CMPXCHG64.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jonathan Corbet <corbet@lwn.net>
---
.../features/locking/cmpxchg64/arch-support.txt | 33 ++++++++++++++++++++++
arch/Kconfig | 3 ++
arch/alpha/Kconfig | 1 +
arch/arm/Kconfig | 1 +
arch/arm64/Kconfig | 1 +
arch/ia64/Kconfig | 1 +
arch/m68k/Kconfig | 1 +
arch/mips/Kconfig | 1 +
arch/parisc/Kconfig | 1 +
arch/powerpc/Kconfig | 1 +
arch/riscv/Kconfig | 1 +
arch/s390/Kconfig | 1 +
arch/sparc/Kconfig | 1 +
arch/x86/Kconfig | 1 +
arch/xtensa/Kconfig | 1 +
15 files changed, 49 insertions(+)
create mode 100644 Documentation/features/locking/cmpxchg64/arch-support.txt

diff --git a/Documentation/features/locking/cmpxchg64/arch-support.txt b/Documentation/features/locking/cmpxchg64/arch-support.txt
new file mode 100644
index 000000000000..84bfef7242b2
--- /dev/null
+++ b/Documentation/features/locking/cmpxchg64/arch-support.txt
@@ -0,0 +1,33 @@
+#
+# Feature name: cmpxchg64
+# Kconfig: ARCH_HAVE_CMPXCHG64
+# description: arch supports the cmpxchg64() API
+#
+ -----------------------
+ | arch |status|
+ -----------------------
+ | alpha: | ok |
+ | arc: | .. |
+ | arm: | ok |
+ | arm64: | ok |
+ | c6x: | .. |
+ | h8300: | .. |
+ | hexagon: | .. |
+ | ia64: | ok |
+ | m68k: | ok |
+ | microblaze: | .. |
+ | mips: | ok |
+ | nds32: | .. |
+ | nios2: | .. |
+ | openrisc: | .. |
+ | parisc: | ok |
+ | powerpc: | ok |
+ | riscv: | ok |
+ | s390: | ok |
+ | sh: | .. |
+ | sparc: | ok |
+ | um: | .. |
+ | unicore32: | .. |
+ | x86: | ok |
+ | xtensa: | ok |
+ -----------------------
diff --git a/arch/Kconfig b/arch/Kconfig
index 8e0d665c8d53..bd54eb125b15 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -358,6 +358,9 @@ config HAVE_ALIGNED_STRUCT_PAGE
on a struct page for better performance. However selecting this
might increase the size of a struct page by a word.

+config ARCH_HAVE_CMPXCHG64
+ bool
+
config HAVE_CMPXCHG_LOCAL
bool

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index b2022885ced8..583bd32c90a7 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -15,6 +15,7 @@ config ALPHA
select AUTO_IRQ_AFFINITY if SMP
select GENERIC_IRQ_SHOW
select ARCH_WANT_IPC_PARSE_VERSION
+ select ARCH_HAVE_CMPXCHG64
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select AUDIT_ARCH
select GENERIC_CLOCKEVENTS
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a7f8e7f4b88f..02c75697176e 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -13,6 +13,7 @@ config ARM
select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
select ARCH_HAS_STRICT_MODULE_RWX if MMU
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+ select ARCH_HAVE_CMPXCHG64 if !THUMB2_KERNEL
select ARCH_HAVE_CUSTOM_GPIO_H
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_MIGHT_HAVE_PC_PARPORT
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index eb2cf4938f6d..dd18d7ca38fa 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -22,6 +22,7 @@ config ARM64
select ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_HAS_STRICT_MODULE_RWX
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+ select ARCH_HAVE_CMPXCHG64
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_INLINE_READ_LOCK if !PREEMPT
select ARCH_INLINE_READ_LOCK_BH if !PREEMPT
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index bbe12a038d21..31c49e1482e2 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -41,6 +41,7 @@ config IA64
select GENERIC_PENDING_IRQ if SMP
select GENERIC_IRQ_SHOW
select GENERIC_IRQ_LEGACY
+ select ARCH_HAVE_CMPXCHG64
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_IOMAP
select GENERIC_SMP_IDLE_THREAD
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 785612b576f7..7b87cda3bbed 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -11,6 +11,7 @@ config M68K
select GENERIC_ATOMIC64
select HAVE_UID16
select VIRT_TO_BUS
+ select ARCH_HAVE_CMPXCHG64
select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS
select GENERIC_CPU_DEVICES
select GENERIC_IOMAP
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 225c95da23ce..088bca0fd9f2 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -7,6 +7,7 @@ config MIPS
select ARCH_DISCARD_MEMBLOCK
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+ select ARCH_HAVE_CMPXCHG64 if 64BIT
select ARCH_SUPPORTS_UPROBES
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_CMPXCHG_LOCKREF if 64BIT
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index fc5a574c3482..166c30865255 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -30,6 +30,7 @@ config PARISC
select GENERIC_ATOMIC64 if !64BIT
select GENERIC_IRQ_PROBE
select GENERIC_PCI_IOMAP
+ select ARCH_HAVE_CMPXCHG64
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_SMP_IDLE_THREAD
select GENERIC_CPU_DEVICES
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c32a181a7cbb..901365d12dcd 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -149,6 +149,7 @@ config PPC
select ARCH_HAS_UACCESS_FLUSHCACHE if PPC64
select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_HAS_ZONE_DEVICE if PPC_BOOK3S_64
+ select ARCH_HAVE_CMPXCHG64 if PPC64
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index cd4fd85fde84..4f886a055ff6 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -8,6 +8,7 @@ config RISCV
select OF
select OF_EARLY_FLATTREE
select OF_IRQ
+ select ARCH_HAVE_CMPXCHG64
select ARCH_WANT_FRAME_POINTERS
select CLONE_BACKWARDS
select COMMON_CLK
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 199ac3e4da1d..f05f7a76ba73 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -73,6 +73,7 @@ config S390
select ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_HAS_STRICT_MODULE_RWX
select ARCH_HAS_UBSAN_SANITIZE_ALL
+ select ARCH_HAVE_CMPXCHG64
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_INLINE_READ_LOCK
select ARCH_INLINE_READ_LOCK_BH
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 8767e45f1b2b..e3429b78c491 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -75,6 +75,7 @@ config SPARC64
select HAVE_PERF_EVENTS
select PERF_USE_VMALLOC
select IRQ_PREFLOW_FASTEOI
+ select ARCH_HAVE_CMPXCHG64
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select HAVE_C_RECORDMCOUNT
select NO_BOOTMEM
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c07f492b871a..1721fcda9822 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -67,6 +67,7 @@ config X86
select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_HAS_ZONE_DEVICE if X86_64
+ select ARCH_HAVE_CMPXCHG64
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
select ARCH_MIGHT_HAVE_PC_PARPORT
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index c921e8bccdc8..0e5c77958fa3 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -4,6 +4,7 @@ config ZONE_DMA

config XTENSA
def_bool y
+ select ARCH_HAVE_CMPXCHG64
select ARCH_NO_COHERENT_DMA_MMAP if !MMU
select ARCH_WANT_FRAME_POINTERS
select ARCH_WANT_IPC_PARSE_VERSION
--
2.16.3
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