linux-kernel - Re: [PATCH v4] RISC-V: Show accurate per-hart isa in /proc/cpuinfo

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Date:   Wed, 30 Aug 2023 06:24:39 -0700
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     Evan Green <evan@...osinc.com>
Cc:     Conor Dooley <conor.dooley@...rochip.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <apatel@...tanamicro.com>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Sunil V L <sunilvl@...tanamicro.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, Heiko Stuebner <heiko@...ech.de>
Subject: Re: [PATCH v4] RISC-V: Show accurate per-hart isa in /proc/cpuinfo


On Tue, 11 Jul 2023 13:18:30 -0700, Evan Green wrote:
> In /proc/cpuinfo, most of the information we show for each processor is
> specific to that hart: marchid, mvendorid, mimpid, processor, hart,
> compatible, and the mmu size. But the ISA string gets filtered through a
> lowest common denominator mask, so that if one CPU is missing an ISA
> extension, no CPUs will show it.
> 
> Now that we track the ISA extensions for each hart, let's report ISA
> extension info accurately per-hart in /proc/cpuinfo. We cannot change
> the "isa:" line, as usermode may be relying on that line to show only
> the common set of extensions supported across all harts. Add a new "hart
> isa" line instead, which reports the true set of extensions for that
> hart. This matches what is returned in riscv_hwprobe() when querying a
> given hart.
> 
> [...]

Applied, thanks!

[1/1] RISC-V: Show accurate per-hart isa in /proc/cpuinfo
      https://git.kernel.org/palmer/c/3d44f547b677

Best regards,
-- 
Palmer Dabbelt <palmer@...osinc.com>