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References: <20220907173903.2268161-1-elver@google.com> <20220907173903.2268161-2-elver@google.com>
 <YxjXwBXpejAP6zoy@boqun-archlinux>
In-Reply-To: <YxjXwBXpejAP6zoy@boqun-archlinux>
From: Marco Elver <elver@google.com>
Date: Wed, 7 Sep 2022 19:43:32 +0200
Message-ID: <CANpmjNN2cch+HDVUYLD27sF9E39RaFrCf++KN=ZZ7j0DH8VaDw@mail.gmail.com>
Subject: Re: [PATCH 2/2] objtool, kcsan: Add volatile read/write
 instrumentation to whitelist
To: Boqun Feng <boqun.feng@gmail.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>, Mark Rutland <mark.rutland@arm.com>, 
	Dmitry Vyukov <dvyukov@google.com>, Alexander Potapenko <glider@google.com>, kasan-dev@googlegroups.com, 
	linux-kernel@vger.kernel.org, Nathan Chancellor <nathan@kernel.org>, 
	Nick Desaulniers <ndesaulniers@google.com>, llvm@lists.linux.dev
Content-Type: text/plain; charset="UTF-8"

On Wed, 7 Sept 2022 at 19:42, Boqun Feng <boqun.feng@gmail.com> wrote:
>
> On Wed, Sep 07, 2022 at 07:39:03PM +0200, Marco Elver wrote:
> > Adds KCSAN's volatile barrier instrumentation to objtool's uaccess
>
> Confused. Are things like "__tsan_volatile_read4" considered as
> "barrier" for KCSAN?

No, it's what's emitted for READ_ONCE() and WRITE_ONCE().

Thanks,
-- Marco