linux-kernel - Re: [PATCH 9/9] RISC-V: Build Infastructure

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Date:   Thu, 29 Jun 2017 09:29:35 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     james.hogan@...tec.com
CC:     albert@...ive.com
Subject:     Re: [PATCH 9/9] RISC-V: Build Infastructure

On Wed, 28 Jun 2017 14:25:00 PDT (-0700), james.hogan@...tec.com wrote:
> Hi Palmer,
>
> On Wed, Jun 28, 2017 at 11:55:38AM -0700, Palmer Dabbelt wrote:
>> +	select SYSRISCV_ATOMIC if !ISA_A
> ...
>> +config SYSRISCV_ATOMIC
>> +	bool "Include support for atomic operation syscalls"
>> +	default !ISA_A
>> +	help
>> +	  If atomic memory instructions are present, i.e.,
>> +	  CONFIG_ISA_A, this includes support for the syscall that
>> +	  provides atomic accesses.  This is only useful to run
>> +	  binaries that require atomic access but were compiled with
>> +	  -mno-atomic.
>> +
>> +	  If CONFIG_ISA_A is unset, this option is mandatory.
>> +
>> +	  If you don't know what to do here, say N.
>
> Can this be removed now that you mentioned the atomics syscall being
> mandatory? I can't find any other references to it.

Oh, sorry, I must have just missed it when swizzling that around.  I'll remove
it as part of our v4.

  diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
  index 38c8112861fd..9f587af28910 100644
  --- a/arch/riscv/Kconfig
  +++ b/arch/riscv/Kconfig
  @@ -155,20 +155,6 @@ config ISA_A

             If you don't know what to do here, say Y.

  -config SYSRISCV_ATOMIC
  -       bool "Include support for atomic operation syscalls"
  -       default !ISA_A
  -       help
  -         If atomic memory instructions are present, i.e.,
  -         CONFIG_ISA_A, this includes support for the syscall that
  -         provides atomic accesses.  This is only useful to run
  -         binaries that require atomic access but were compiled with
  -         -mno-atomic.
  -
  -         If CONFIG_ISA_A is unset, this option is mandatory.
  -
  -         If you don't know what to do here, say N.
  -
   config RV_PUM
          def_bool y
          prompt "Protect User Memory" if EXPERT

Thanks for catching this!