linux-kernel - Re: [PATCH 0/3] RISC-V: Export Zba, Zbb to usermode via hwprobe

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Message-ID: <20230429-104e430d8f02e587aeff2652@orel>
Date:   Sat, 29 Apr 2023 14:34:33 +0200
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Evan Green <evan@...osinc.com>
Cc:     Palmer Dabbelt <palmer@...osinc.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Bresticker <abrestic@...osinc.com>,
        Anup Patel <apatel@...tanamicro.com>,
        Celeste Liu <coelacanthus@...look.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Dao Lu <daolu@...osinc.com>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Jisheng Zhang <jszhang@...nel.org>,
        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
Subject: Re: [PATCH 0/3] RISC-V: Export Zba, Zbb to usermode via hwprobe

On Fri, Apr 28, 2023 at 12:06:05PM -0700, Evan Green wrote:
> 
> This change detects the presence of Zba and Zbb extensions and exports
> them per-hart to userspace via the hwprobe mechanism. Glibc can then use
> these in setting up hwcaps-based library search paths.
> 
> There's a little bit of extra housekeeping here: the first change adds
> Zba to the set of extensions the kernel recognizes, and the second
> change starts tracking ISA features per-hart (in addition to the ANDed
> mask of features across all harts which the kernel uses to make
> decisions). Now that we track the ISA information per-hart, we could
> even fix up /proc/cpuinfo to accurately report extension per-hart,
> though I've left that out of this series for now.
> 
> 
> Evan Green (3):
>   RISC-V: Add Zba extension probing
>   RISC-V: Track ISA extensions per hart
>   RISC-V: hwprobe: Expose Zba and Zbb
> 
>  Documentation/riscv/hwprobe.rst       |  7 +++++
>  arch/riscv/include/asm/cpufeature.h   | 10 +++++++
>  arch/riscv/include/asm/hwcap.h        |  1 +
>  arch/riscv/include/uapi/asm/hwprobe.h |  2 ++
>  arch/riscv/kernel/cpu.c               |  1 +
>  arch/riscv/kernel/cpufeature.c        | 19 ++++++++----
>  arch/riscv/kernel/sys_riscv.c         | 43 ++++++++++++++++++++++-----
>  7 files changed, 70 insertions(+), 13 deletions(-)
> 
> -- 
> 2.25.1
>

For the series

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>