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From: Peter Zijlstra <peterz@infradead.org>
To: "Joel Fernandes (Google)" <joel@joelfernandes.org>
Cc: linux-kernel@vger.kernel.org,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Borislav Petkov <bp@alien8.de>,
	c0d1n61at3@gmail.com, "David S. Miller" <davem@davemloft.net>,
	edumazet@google.com,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	Josh Triplett <josh@joshtriplett.org>,
	keescook@chromium.org, kernel-hardening@lists.openwall.com,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Len Brown <lenb@kernel.org>,
	linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-pm@vger.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	neilb@suse.com, netdev@vger.kernel.org, oleg@redhat.com,
	"Paul E. McKenney" <paulmck@linux.ibm.com>,
	Pavel Machek <pavel@ucw.cz>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Rasmus Villemoes <rasmus.villemoes@prevas.dk>,
	rcu@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>,
	Tejun Heo <tj@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
	will@kernel.org,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>
Subject: Re: [PATCH v1 1/6] rcu: Add support for consolidated-RCU reader checking
Date: Fri, 12 Jul 2019 13:01:42 +0200	[thread overview]
Message-ID: <20190712110142.GS3402@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190711234401.220336-2-joel@joelfernandes.org>

On Thu, Jul 11, 2019 at 07:43:56PM -0400, Joel Fernandes (Google) wrote:
> This patch adds support for checking RCU reader sections in list
> traversal macros. Optionally, if the list macro is called under SRCU or
> other lock/mutex protection, then appropriate lockdep expressions can be
> passed to make the checks pass.
> 
> Existing list_for_each_entry_rcu() invocations don't need to pass the
> optional fourth argument (cond) unless they are under some non-RCU
> protection and needs to make lockdep check pass.
> 
> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
> ---
>  include/linux/rculist.h  | 29 ++++++++++++++++++++++++-----
>  include/linux/rcupdate.h |  7 +++++++
>  kernel/rcu/Kconfig.debug | 11 +++++++++++
>  kernel/rcu/update.c      | 26 ++++++++++++++++++++++++++
>  4 files changed, 68 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/rculist.h b/include/linux/rculist.h
> index e91ec9ddcd30..78c15ec6b2c9 100644
> --- a/include/linux/rculist.h
> +++ b/include/linux/rculist.h
> @@ -40,6 +40,23 @@ static inline void INIT_LIST_HEAD_RCU(struct list_head *list)
>   */
>  #define list_next_rcu(list)	(*((struct list_head __rcu **)(&(list)->next)))
>  
> +/*
> + * Check during list traversal that we are within an RCU reader
> + */
> +
> +#define SIXTH_ARG(a1, a2, a3, a4, a5, a6, ...) a6
> +#define COUNT_VARGS(...) SIXTH_ARG(dummy, ## __VA_ARGS__, 4, 3, 2, 1, 0)

You don't seem to actually use it in this patch; also linux/kernel.h has
COUNT_ARGS().

  parent reply	other threads:[~2019-07-12 11:03 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-11 23:43 [PATCH v1 0/6] Harden list_for_each_entry_rcu() and family Joel Fernandes (Google)
2019-07-11 23:43 ` [PATCH v1 1/6] rcu: Add support for consolidated-RCU reader checking Joel Fernandes (Google)
2019-07-12  4:49   ` Joel Fernandes
2019-07-12 11:01   ` Peter Zijlstra [this message]
2019-07-12 14:49     ` Joel Fernandes
2019-07-12 11:11   ` Peter Zijlstra
2019-07-12 15:10     ` Joel Fernandes
2019-07-12 15:58       ` Peter Zijlstra
2019-07-12 16:45       ` Paul E. McKenney
2019-07-12 17:06         ` Joel Fernandes
2019-07-12 17:46           ` Paul E. McKenney
2019-07-12 19:40             ` Joel Fernandes
2019-07-12 23:27               ` Paul E. McKenney
2019-07-12 12:12   ` Oleg Nesterov
2019-07-12 13:56     ` Joel Fernandes
2019-07-11 23:43 ` [PATCH v1 2/6] ipv4: add lockdep condition to fix for_each_entry Joel Fernandes (Google)
2019-07-11 23:43 ` [PATCH v1 3/6] driver/core: Convert to use built-in RCU list checking Joel Fernandes (Google)
2019-07-12  5:19   ` Greg Kroah-Hartman
2019-07-11 23:43 ` [PATCH v1 4/6] workqueue: Convert for_each_wq to use built-in list check Joel Fernandes (Google)
2019-07-11 23:44 ` [PATCH v1 5/6] x86/pci: Pass lockdep condition to pcm_mmcfg_list iterator Joel Fernandes (Google)
2019-07-11 23:44 ` [PATCH v1 6/6] acpi: Use built-in RCU list checking for acpi_ioremaps list Joel Fernandes (Google)
2019-07-11 23:52 ` [PATCH v1 0/6] Harden list_for_each_entry_rcu() and family Joel Fernandes

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