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Message-ID: <C2876D88-F59B-48D7-85D9-49EB79B1FBE3@zytor.com>
Date: Fri, 18 May 2018 11:32:57 -0700
From: hpa@...or.com
To: Bart Van Assche <bart.vanassche@....com>,
Jens Axboe <axboe@...nel.dk>
CC: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
Christoph Hellwig <hch@....de>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Tony Luck <tony.luck@...el.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
"James E.J. Bottomley" <jejb@...isc-linux.org>,
Helge Deller <deller@....de>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
"David S . Miller" <davem@...emloft.net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Chris Zankel <chris@...kel.net>,
Max Filippov <jcmvbkbc@...il.com>,
Arnd Bergmann <arnd@...db.de>, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v11 1/2] arch/*: Add CONFIG_ARCH_HAVE_CMPXCHG64
On May 18, 2018 11:00:05 AM PDT, Bart Van Assche <bart.vanassche@....com> wrote:
>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@....com>
>Cc: Catalin Marinas <catalin.marinas@....com>
>Cc: Will Deacon <will.deacon@....com>
>Cc: Tony Luck <tony.luck@...el.com>
>Cc: Fenghua Yu <fenghua.yu@...el.com>
>Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
>Cc: "James E.J. Bottomley" <jejb@...isc-linux.org>
>Cc: Helge Deller <deller@....de>
>Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>Cc: Paul Mackerras <paulus@...ba.org>
>Cc: Michael Ellerman <mpe@...erman.id.au>
>Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
>Cc: Heiko Carstens <heiko.carstens@...ibm.com>
>Cc: David S. Miller <davem@...emloft.net>
>Cc: Thomas Gleixner <tglx@...utronix.de>
>Cc: Ingo Molnar <mingo@...hat.com>
>Cc: H. Peter Anvin <hpa@...or.com>
>Cc: Chris Zankel <chris@...kel.net>
>Cc: Max Filippov <jcmvbkbc@...il.com>
>Cc: Arnd Bergmann <arnd@...db.de>
>Cc: Jonathan Corbet <corbet@....net>
>---
>.../features/locking/cmpxchg64/arch-support.txt | 33
>++++++++++++++++++++++
> arch/Kconfig | 4 +++
> arch/arm/Kconfig | 1 +
> arch/ia64/Kconfig | 1 +
> arch/m68k/Kconfig | 1 +
> arch/mips/Kconfig | 1 +
> arch/parisc/Kconfig | 1 +
> arch/riscv/Kconfig | 1 +
> arch/sparc/Kconfig | 1 +
> arch/x86/Kconfig | 1 +
> arch/xtensa/Kconfig | 1 +
> 11 files changed, 46 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..9840b2577af1 100644
>--- a/arch/Kconfig
>+++ b/arch/Kconfig
>@@ -358,6 +358,10 @@ 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
>+ default y if 64BIT
>+
> config HAVE_CMPXCHG_LOCAL
> bool
>
>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/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/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/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..52331f395bf4 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 if X86_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
Perhaps it would be better to define cmpxchg64 as a macro (which can be #define cmpxchg64 cmpxchg64) rather putting this in Kconfig? Putting it in Kconfig makes sense if it affects config options.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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