From: Kees Cook <keescook@chromium.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Eric Biggers <ebiggers@kernel.org>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Will Deacon <will@kernel.org>,
Elena Reshetova <elena.reshetova@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Anna-Maria Gleixner <anna-maria@linutronix.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: [PATCH] locking/refcount: add sparse annotations to dec-and-lock functions
Date: Mon, 30 Dec 2019 10:43:20 -0800 [thread overview]
Message-ID: <201912301042.FB806E1133@keescook> (raw)
In-Reply-To: <20191228114918.GU2827@hirez.programming.kicks-ass.net>
On Sat, Dec 28, 2019 at 12:49:18PM +0100, Peter Zijlstra wrote:
> On Thu, Dec 26, 2019 at 09:29:22AM -0600, Eric Biggers wrote:
> > From: Eric Biggers <ebiggers@google.com>
> >
> > Wrap refcount_dec_and_lock() and refcount_dec_and_lock_irqsave() with
> > macros using __cond_lock() so that 'sparse' doesn't report warnings
> > about unbalanced locking when using them.
> >
> > This is the same thing that's done for their atomic_t equivalents.
> >
> > Don't annotate refcount_dec_and_mutex_lock(), because mutexes don't
> > currently have sparse annotations.
>
> I so f'ing hate that __cond_lock() crap. Previously I've suggested
> fixing sparse instead of making such an atrocious trainwreck of the
> code.
Ew, I never noticed these before. That is pretty ugly. Can't __acquire()
be used directly in the functions instead of building the nasty
wrappers?
--
Kees Cook
next prev parent reply other threads:[~2019-12-30 18:43 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-26 15:29 [PATCH] locking/refcount: add sparse annotations to dec-and-lock functions Eric Biggers
2019-12-28 11:49 ` Peter Zijlstra
2019-12-28 20:15 ` Eric Biggers
2019-12-30 18:43 ` Kees Cook [this message]
2019-12-30 19:15 ` Eric Biggers
2019-12-30 19:32 ` Kees Cook
2019-12-30 23:38 ` Luc Van Oostenryck
2020-01-03 1:35 ` Linus Torvalds
2020-01-03 2:18 ` Luc Van Oostenryck
2020-01-03 12:55 ` Dan Carpenter
2020-01-06 15:41 ` Peter Zijlstra
2020-01-06 17:54 ` Luc Van Oostenryck
2020-01-07 9:29 ` Peter Zijlstra
2020-01-06 15:26 ` Peter Zijlstra
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