linux-kernel - Re: Control Dependencies vs C Compilers

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Message-ID: <20201006161039.GF5822@1wt.eu>
Date:   Tue, 6 Oct 2020 18:10:39 +0200
From:   Willy Tarreau <w@....eu>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     David Laight <David.Laight@...LAB.COM>,
        "'Nick Clifton'" <nickc@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "stern@...land.harvard.edu" <stern@...land.harvard.edu>,
        "linux-toolchains@...r.kernel.org" <linux-toolchains@...r.kernel.org>,
        Will Deacon <will@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "parri.andrea@...il.com" <parri.andrea@...il.com>,
        "boqun.feng@...il.com" <boqun.feng@...il.com>,
        "npiggin@...il.com" <npiggin@...il.com>,
        "dhowells@...hat.com" <dhowells@...hat.com>,
        "j.alglave@....ac.uk" <j.alglave@....ac.uk>,
        "luc.maranget@...ia.fr" <luc.maranget@...ia.fr>,
        "akiyks@...il.com" <akiyks@...il.com>,
        "dlustig@...dia.com" <dlustig@...dia.com>,
        "joel@...lfernandes.org" <joel@...lfernandes.org>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>
Subject: Re: Control Dependencies vs C Compilers

On Tue, Oct 06, 2020 at 08:50:52AM -0700, Paul E. McKenney wrote:
> Comparing 25+ assembly languages to but two compilers most definitely
> motivates looking hard at doing something with the compilers.

+1, especially since the kernel is not special; anyone working with
threads faces the same issues in userland, which are often hidden
behind the implicit whole-memory clobbers of certain operations or
the call to mutex manipulation functions, but which become a reality
again as soon as you go slightly away from these and try to use
lockless mechanisms.

Willy