From: peterz@infradead.org
To: Marco Elver <elver@google.com>
Cc: linux-kernel@vger.kernel.org, davem@davemloft.net,
kuba@kernel.org, netdev@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>,
Eric Dumazet <edumazet@google.com>
Subject: Re: [PATCH] random32: Use rcuidle variant for tracepoint
Date: Fri, 21 Aug 2020 10:59:07 +0200 [thread overview]
Message-ID: <20200821085907.GJ1362448@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20200821063043.1949509-1-elver@google.com>
On Fri, Aug 21, 2020 at 08:30:43AM +0200, Marco Elver wrote:
> With KCSAN enabled, prandom_u32() may be called from any context,
> including idle CPUs.
>
> Therefore, switch to using trace_prandom_u32_rcuidle(), to avoid various
> issues due to recursion and lockdep warnings when KCSAN and tracing is
> enabled.
At some point we're going to have to introduce noinstr to idle as well.
But until that time this should indeed cure things.
next prev parent reply other threads:[~2020-08-21 8:59 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 6:30 [PATCH] random32: Use rcuidle variant for tracepoint Marco Elver
2020-08-21 8:58 ` Marco Elver
2020-08-21 8:59 ` peterz [this message]
2020-08-21 15:06 ` Eric Dumazet
2020-08-21 15:35 ` Marco Elver
2020-09-18 1:21 ` Steven Rostedt
2020-08-21 15:38 ` Steven Rostedt
2020-08-21 15:41 ` Steven Rostedt
2020-08-21 18:38 ` Peter Zijlstra
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