From: Marco Elver <elver@google.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
Andrey Konovalov <andreyknvl@google.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
kasan-dev <kasan-dev@googlegroups.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
christophe leroy <christophe.leroy@c-s.fr>,
Daniel Axtens <dja@axtens.net>,
linux-arch <linux-arch@vger.kernel.org>
Subject: Re: [PATCH -rcu] asm-generic, kcsan: Add KCSAN instrumentation for bitops
Date: Wed, 15 Jan 2020 20:51:26 +0100 [thread overview]
Message-ID: <CANpmjNOpTYnF3ssqrE_s+=UA-2MpfzzdrXoyaifb3A55_mc0uA@mail.gmail.com> (raw)
In-Reply-To: <CAK8P3a3b=SviUkQw7ZXZF85gS1JO8kzh2HOns5zXoEJGz-+JiQ@mail.gmail.com>
On Wed, 15 Jan 2020 at 20:27, Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Wed, Jan 15, 2020 at 5:58 PM Marco Elver <elver@google.com> wrote:
> > * set_bit - Atomically set a bit in memory
> > @@ -26,6 +27,7 @@
> > static inline void set_bit(long nr, volatile unsigned long *addr)
> > {
> > kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
> > + kcsan_check_atomic_write(addr + BIT_WORD(nr), sizeof(long));
> > arch_set_bit(nr, addr);
> > }
>
> It looks like you add a kcsan_check_atomic_write or kcsan_check_write directly
> next to almost any instance of kasan_check_write().
>
> Are there any cases where we actually just need one of the two but not the
> other? If not, maybe it's better to rename the macro and have it do both things
> as needed?
Do you mean adding an inline helper at the top of each bitops header
here, similar to what we did for atomic-instrumented? Happy to do
that if it improves readability.
Thanks,
-- Marco
next prev parent reply other threads:[~2020-01-15 19:51 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-15 16:57 [PATCH -rcu] asm-generic, kcsan: Add KCSAN instrumentation for bitops Marco Elver
2020-01-15 19:27 ` Arnd Bergmann
2020-01-15 19:51 ` Marco Elver [this message]
2020-01-15 19:54 ` Arnd Bergmann
2020-01-15 20:50 ` Marco Elver
2020-01-17 12:25 ` Arnd Bergmann
2020-01-17 13:14 ` Marco Elver
2020-01-20 14:23 ` Marco Elver
2020-01-20 14:40 ` Arnd Bergmann
2020-01-20 15:11 ` Marco Elver
2020-01-20 19:02 ` Arnd Bergmann
2020-01-21 16:12 ` Marco Elver
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