linux-kernel - Re: [patches] [PATCH 17/17] RISC-V: Build Infastructure

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Message-ID: <20170726183740.uemls2y6ktpngpim@latitude>
Date:   Wed, 26 Jul 2017 20:37:41 +0200
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     j.neuschaefer@....net, patches@...ups.riscv.org,
        Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
        akpm@...ux-foundation.org, albert@...ive.com,
        yamada.masahiro@...ionext.com, mmarek@...e.com,
        will.deacon@....com, peterz@...radead.org, boqun.feng@...il.com,
        mingo@...hat.com, daniel.lezcano@...aro.org, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com,
        gregkh@...uxfoundation.org, jslaby@...e.com, davem@...emloft.net,
        mchehab@...nel.org, sfr@...b.auug.org.au, fweisbec@...il.com,
        viro@...iv.linux.org.uk, mcgrof@...nel.org, dledford@...hat.com,
        bart.vanassche@...disk.com, sstabellini@...nel.org,
        daniel.vetter@...ll.ch, mpe@...erman.id.au, msalter@...hat.com,
        nicolas.dichtel@...nd.com, james.hogan@...tec.com,
        paul.gortmaker@...driver.com, linux@...ck-us.net,
        heiko.carstens@...ibm.com, schwidefsky@...ibm.com,
        linux-kernel@...r.kernel.org
Subject: Re: [patches] [PATCH 17/17] RISC-V: Build Infastructure

On Tue, Jul 25, 2017 at 10:20:50PM -0700, Palmer Dabbelt wrote:
> On Tue, 25 Jul 2017 19:57:17 PDT (-0700), j.neuschaefer@....net wrote:
> > On Tue, Jul 11, 2017 at 06:31:30PM -0700, Palmer Dabbelt wrote:
[...]
> >> +config ISA_C
> >> +	bool "Emit compressed instructions when building Linux"
> >
> > As a user, I'd prefer to have slightly more globally-recognisable names
> > than ISA_<single letter> for RISC-V instruction set architecture
> > extensions. A quick "git grep -A2 'config ISA'" shows the following
> > Kconfig symbols:
> >
> > * ISA, ISA_BUS_API, ISA_DMA_API, ISAPNP:
> >   Settings related to the historic ISA bus.
> > * ISA_ARCOMPACT/ISA_ARCV2 (arch/arc),
> >   ISA_M32R/ISA_M32R2/ISA_DSP_LEVEL2/ISA_DUAL_ISSUE (arch/m32r):
> >   Instruction set options.
> >
> > Four out of the six instruction set options have ARC/M32R in the name,
> > and I think that makes things slightly more readable. Therefore I
> > humbly propose something longer, and with a hint of RISC-V in the name,
> > such as ISA_RVC.
> >
> > (Take this with a grain of salt, perhaps.)
> 
> Good timing: I was about to submit a v6 patch set.  I'm cool with
> CONFIG_ISA_RVC and friends, do you mind submitting a patch?

I'm not sure about ISA_A, because as I understand the mails in one of
the previous review threads, RVA is now required by Linux, so there
shouldn't be a need for CONFIG_ISA_A (or an equivalent option).

CONFIG_RISCV_ISA_C (which Arnd suggested) makes it even clearer that
these are RISC-V related options.

Here's my patch, for reference (untested, because I currently don't have
a riscv compiler installed):


Subject: [PATCH] RISC-V: Rename CONFIG_ISA_C to CONFIG_ISA_RVC

To make it clearer that ISA_C is a RISC-V related option, rename it to
ISA_RVC.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
---
 arch/riscv/Kconfig  | 2 +-
 arch/riscv/Makefile | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index cc274bbc29a7..8c43e5c73892 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -135,7 +135,7 @@ config TUNE_GENERIC
 
 endchoice
 
-config ISA_C
+config ISA_RVC
 	bool "Emit compressed instructions when building Linux"
 	default n
 	help
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 66c4a5e383f9..7ac91bcf9fe7 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -40,7 +40,7 @@ KBUILD_CFLAGS += -Wall
 ifeq ($(CONFIG_ISA_A),y)
 	KBUILD_ARCH_A = a
 endif
-ifeq ($(CONFIG_ISA_C),y)
+ifeq ($(CONFIG_ISA_RVC),y)
 	KBUILD_ARCH_C = c
 endif
 
-- 
2.11.0


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