On Thu, Sep 3, 2020 at 12:01 AM Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx> wrote: > > Armv6, sh2, sparc32 and xtensa can not do cmpxchg1, so we have to use > cmpxchg4 on it. [...] > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig> index e00d94b16658..03a6c7fd999d 100644 > --- a/arch/arm/Kconfig > +++ b/arch/arm/Kconfig > @@ -48,6 +48,7 @@ config ARM > select GENERIC_ALLOCATOR > select GENERIC_ARCH_TOPOLOGY if ARM_CPU_TOPOLOGY > select GENERIC_ATOMIC64 if CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI > + select NO_CMPXCHG_BYTE if CPU_V6 > select GENERIC_CLOCKEVENTS_BROADCAST if SMP > select GENERIC_CPU_AUTOPROBE > select GENERIC_EARLY_IOREMAP > diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig > index d20927128fce..4c7f0ad5b93f 100644 > --- a/arch/sh/Kconfig > +++ b/arch/sh/Kconfig > @@ -155,6 +155,7 @@ menu "System type" > config CPU_SH2 > bool > select SH_INTC > + select NO_CMPXCHG_BYTE > > config CPU_SH2A > bool > diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig > index efeff2c896a5..51ae5c8ede87 100644 > --- a/arch/sparc/Kconfig > +++ b/arch/sparc/Kconfig > @@ -58,6 +58,7 @@ config SPARC32 > select CLZ_TAB > select HAVE_UID16 > select OLD_SIGACTION > + select NO_CMPXCHG_BYTE > > config SPARC64 > def_bool 64BIT > diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig > index e997e0119c02..862b008ab09e 100644 > --- a/arch/xtensa/Kconfig > +++ b/arch/xtensa/Kconfig > @@ -42,6 +42,7 @@ config XTENSA > select MODULES_USE_ELF_RELA > select PERF_USE_VMALLOC > select VIRT_TO_BUS > + select NO_CMPXCHG_BYTE Please keep the lists of select statements in Kconfig files above alphabetically sorted. -- Thanks. -- Max
