linux-kernel - Re: [PATCH v8 3/3] x86: vdso: Wire up getrandom() vDSO implementation

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Message-Id: <2cb4b4a7-1d39-4f63-aee0-b4fc43efa68d@app.fastmail.com>
Date:   Mon, 28 Nov 2022 22:12:45 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Jason A . Donenfeld" <Jason@...c4.com>
Cc:     linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        "Thomas Gleixner" <tglx@...utronix.de>,
        linux-crypto@...r.kernel.org, linux-api@...r.kernel.org,
        x86@...nel.org, "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Adhemerval Zanella Netto" <adhemerval.zanella@...aro.org>,
        "Carlos O'Donell" <carlos@...hat.com>,
        "Florian Weimer" <fweimer@...hat.com>,
        "Christian Brauner" <brauner@...nel.org>,
        "Samuel Neves" <sneves@....uc.pt>
Subject: Re: [PATCH v8 3/3] x86: vdso: Wire up getrandom() vDSO implementation

On Mon, Nov 28, 2022, at 21:02, Jason A. Donenfeld wrote:
> On Mon, Nov 28, 2022 at 8:57 PM Arnd Bergmann <arnd@...db.de> wrote:

> Okay, I can split it that way. If I gather your meaning correctly:
>
> 1) generic syscall C code
> 2) #define __NR_... in asm-generic/unistd.h x86/.../unistd.h,
> x86/.../syscall_64.tbl

I mean all syscall*.tbl files, not just x86. There are currently
eight architectures using asm-generic/unistd.h, the rest use
syscall.tbl.

> 3) generic vdso C code
> 4) hook up x86 vdso, and select the right Kconfig symbol to start
> compiling the code
>
> Is that what you have in mind? If so, I'll name (2) "arch: wire up
> vgetrandom_alloc() syscall number".

That sounds good, yes.

      Arnd