From: Andrew Jones <ajones@ventanamicro.com>
To: Conor Dooley <conor@kernel.org>
Cc: Conor Dooley <conor.dooley@microchip.com>,
palmer@dabbelt.com, Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Heiko Stuebner <heiko.stuebner@vrull.eu>,
Evan Green <evan@rivosinc.com>,
Sunil V L <sunilvl@ventanamicro.com>,
linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 2/9] RISC-V: drop a needless check in print_isa_ext()
Date: Mon, 26 Jun 2023 18:29:38 +0200 [thread overview]
Message-ID: <20230626-285e425abaadb83dd37d97fd@orel> (raw)
In-Reply-To: <20230626-jitters-spiral-68e941d0ad3f@spud>
On Mon, Jun 26, 2023 at 05:08:28PM +0100, Conor Dooley wrote:
> On Mon, Jun 26, 2023 at 05:19:08PM +0200, Andrew Jones wrote:
> > On Mon, Jun 26, 2023 at 12:19:40PM +0100, Conor Dooley wrote:
> > > isa_ext_arr cannot be empty, as some of the extensions within it are
> > > always built into the kernel.
> >
> > This is only true since commit 07edc32779e3 ("RISC-V: always report
> > presence of extensions formerly part of the base ISA"), right? If
> > so, it might be nice to call that commit out in this commit message.
>
> Per my last mail, where I commented on the origins of some of this code,
> there were no multi-letter extensions when this code was first added.
> When the first multi-letter ones did get added, it was Sscofpmf - that
> doesn't have a Kconfig symbol to disable it, so I think this has been
> redundant for a long time.
>
> Apart from the ones I recently added, there's a fair few others that
> are not gated & should always be present.
> It's probably not clear from the comment, but this check is for whether
> the kernel supports extensions, not whether the system it is running on
> does. I guess I should expand on that in my commit message.
That part I understood, but I was thinking it'd be nice to call out when
the first extension was added which cannot be disabled by a config to
provide extra evidence that it's safe to remove the check.
Thanks,
drew
next prev parent reply other threads:[~2023-06-26 16:30 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-26 11:19 [PATCH v1 0/9] RISC-V: Probe DT extension support using riscv,isa-extensions & riscv,isa-base Conor Dooley
2023-06-26 11:19 ` [PATCH v1 1/9] RISC-V: don't parse dt/acpi isa string to get rv32/rv64 Conor Dooley
2023-06-26 15:14 ` Andrew Jones
2023-06-26 15:51 ` Conor Dooley
2023-06-26 16:05 ` Andrew Jones
2023-06-26 16:16 ` Conor Dooley
2023-06-27 8:02 ` Sunil V L
2023-06-27 8:51 ` Conor Dooley
2023-06-27 9:20 ` Sunil V L
2023-06-26 11:19 ` [PATCH v1 2/9] RISC-V: drop a needless check in print_isa_ext() Conor Dooley
2023-06-26 15:19 ` Andrew Jones
2023-06-26 16:08 ` Conor Dooley
2023-06-26 16:29 ` Andrew Jones [this message]
2023-06-26 11:19 ` [PATCH v1 3/9] RISC-V: shunt isa_ext_arr to cpufeature.c Conor Dooley
2023-06-26 15:29 ` Andrew Jones
2023-06-26 15:44 ` Andrew Jones
2023-06-26 15:59 ` Conor Dooley
2023-06-26 11:19 ` [PATCH v1 4/9] RISC-V: repurpose riscv_isa_ext array in riscv_fill_hwcap() Conor Dooley
2023-06-26 15:33 ` Andrew Jones
2023-06-26 11:19 ` [PATCH v1 5/9] RISC-V: add missing single letter extension definitions Conor Dooley
2023-06-26 15:34 ` Andrew Jones
2023-06-26 11:19 ` [PATCH v1 6/9] RISC-V: add single letter extensions to riscv_isa_ext Conor Dooley
2023-06-26 15:42 ` Andrew Jones
2023-06-28 17:33 ` Evan Green
2023-06-28 17:43 ` Conor Dooley
2023-06-28 17:50 ` Evan Green
2023-06-26 11:19 ` [PATCH v1 7/9] RISC-V: split riscv_fill_hwcap() in 3 Conor Dooley
2023-06-26 16:17 ` Andrew Jones
2023-06-27 17:42 ` Conor Dooley
2023-06-26 11:19 ` [PATCH v1 8/9] RISC-V: enable extension detection from new properties Conor Dooley
2023-06-26 16:24 ` Andrew Jones
2023-06-26 11:19 ` [PATCH v1 9/9] RISC-V: try new extension properties in of_early_processor_hartid() Conor Dooley
2023-06-26 16:25 ` Andrew Jones
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