linux-kernel - Re: [PATCH v5] riscv: hwprobe: export highest virtual userspace address

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Message-Id: 
 <172077963258.4770.205626830375405089.git-patchwork-notify@kernel.org>
Date: Fri, 12 Jul 2024 10:20:32 +0000
From: patchwork-bot+linux-riscv@...nel.org
To: Clément Léger <cleger@...osinc.com>@codeaurora.org
Cc: linux-riscv@...ts.infradead.org, corbet@....net, paul.walmsley@...ive.com,
 palmer@...belt.com, aou@...s.berkeley.edu, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, rehn@...osinc.com, charlie@...osinc.com,
 sorear@...tmail.com, jrtc27@...c27.com
Subject: Re: [PATCH v5] riscv: hwprobe: export highest virtual userspace address

Hello:

This patch was applied to riscv/linux.git (for-next)
by Palmer Dabbelt <palmer@...osinc.com>:

On Wed, 10 Apr 2024 16:45:57 +0200 you wrote:
> Some userspace applications (OpenJDK for instance) uses the free MSBs
> in pointers to insert additional information for their own logic and
> need to get this information from somewhere. Currently they rely on
> parsing /proc/cpuinfo "mmu=svxx" string to obtain the current value of
> virtual address usable bits [1]. Since this reflect the raw supported
> MMU mode, it might differ from the logical one used internally which is
> why arch_get_mmap_end() is used. Exporting the highest mmapable address
> through hwprobe will allow a more stable interface to be used. For that
> purpose, add a new hwprobe key named
> RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS which will export the highest
> userspace virtual address.
> 
> [...]

Here is the summary with links:
  - [v5] riscv: hwprobe: export highest virtual userspace address
    https://git.kernel.org/riscv/c/c9b8cd139c1d

You are awesome, thank you!
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