linux-kernel - Re: [RFC] LKMM: Add volatile

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Message-ID: <20210604153518.GD18427@gate.crashing.org>
Date:   Fri, 4 Jun 2021 10:35:18 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>, will@...nel.org,
        paulmck@...nel.org, stern@...land.harvard.edu,
        parri.andrea@...il.com, boqun.feng@...il.com, npiggin@...il.com,
        dhowells@...hat.com, j.alglave@....ac.uk, luc.maranget@...ia.fr,
        akiyks@...il.com, linux-kernel@...r.kernel.org,
        linux-toolchains@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [RFC] LKMM: Add volatile_if()

On Fri, Jun 04, 2021 at 01:44:37PM +0200, Peter Zijlstra wrote:
> On naming (sorry Paul for forgetting that in the initial mail); while I
> think using the volatile qualifier for the language feature (can we haz
> plz, kthxbai) makes perfect sense, Paul felt that we might use a
> 'better' name for the kernel use, ctrl_dep_if() was proposed.

In standard C statements do not have qualifiers.  Unless you can
convince the ISO C committee to have them on "if", you will have a very
hard time convincing any serious compiler to do this.


Segher