On May 18, 2018 11:00:05 AM PDT, Bart Van Assche <bart.vanassche@xxxxxxx> 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@xxxxxxx> >Cc: Catalin Marinas <catalin.marinas@xxxxxxx> >Cc: Will Deacon <will.deacon@xxxxxxx> >Cc: Tony Luck <tony.luck@xxxxxxxxx> >Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx> >Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> >Cc: "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxx> >Cc: Helge Deller <deller@xxxxxx> >Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> >Cc: Paul Mackerras <paulus@xxxxxxxxx> >Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> >Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> >Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx> >Cc: David S. Miller <davem@xxxxxxxxxxxxx> >Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> >Cc: Ingo Molnar <mingo@xxxxxxxxxx> >Cc: H. Peter Anvin <hpa@xxxxxxxxx> >Cc: Chris Zankel <chris@xxxxxxxxxx> >Cc: Max Filippov <jcmvbkbc@xxxxxxxxx> >Cc: Arnd Bergmann <arnd@xxxxxxxx> >Cc: Jonathan Corbet <corbet@xxxxxxx> >--- >.../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.
