On 9/26/19 9:30 AM, Catalin Marinas wrote:
> On Thu, Sep 26, 2019 at 07:03:51AM +0100, Vincenzo Frascino wrote:
>> diff --git a/arch/arm64/include/asm/vdso/compat_barrier.h
>> b/arch/arm64/include/asm/vdso/compat_barrier.h
>> index fb60a88b5ed4..3fd8fd6d8fc2 100644
>> --- a/arch/arm64/include/asm/vdso/compat_barrier.h
>> +++ b/arch/arm64/include/asm/vdso/compat_barrier.h
>> @@ -20,7 +20,7 @@
>>
>> #define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory")
>>
>> -#if __LINUX_ARM_ARCH__ >= 8
>> +#if __LINUX_ARM_ARCH__ >= 8 && defined(CONFIG_AS_DMB_ISHLD)
>> #define aarch32_smp_mb() dmb(ish)
>> #define aarch32_smp_rmb() dmb(ishld)
>> #define aarch32_smp_wmb() dmb(ishst)
>> diff --git a/arch/arm64/kernel/vdso32/Makefile
>> b/arch/arm64/kernel/vdso32/Makefile
>> index 1fba0776ed40..1a3299d901b1 100644
>> --- a/arch/arm64/kernel/vdso32/Makefile
>> +++ b/arch/arm64/kernel/vdso32/Makefile
>> @@ -55,6 +55,9 @@ endif
>> VDSO_CAFLAGS += -fPIC -fno-builtin -fno-stack-protector
>> VDSO_CAFLAGS += -DDISABLE_BRANCH_PROFILING
>>
>> +# Check for binutils support for dmb ishld
>> +dmbinstr := $(call as-instr,dmb ishld,-DCONFIG_AS_DMB_ISHLD=1)
>
> Is this check for the compat gas or the native one? Looking at
> scripts/Kbuild.include, as-instr uses CC but you'd need a COMPATCC here
> instead.
>
> I may have missed something but I don't think this fixes the issue
> Will's issue since he reported the problem with an old compat binutils.
>
Good catch I thought that it was sufficient to put it in the correct makefile,
but I missed that COMPATCC != CC. This selects the wrong binutils.
Need to add something in Kbuild for that.
--
Regards,
Vincenzo
