From: Peter Zijlstra <peterz@infradead.org>
To: "Ahmed S. Darwish" <a.darwish@linutronix.de>
Cc: mingo@kernel.org, will@kernel.org, tglx@linutronix.de,
x86@kernel.org, linux-kernel@vger.kernel.org,
rostedt@goodmis.org, bigeasy@linutronix.de, davem@davemloft.net,
sparclinux@vger.kernel.org, mpe@ellerman.id.au,
linuxppc-dev@lists.ozlabs.org, heiko.carstens@de.ibm.com,
linux-s390@vger.kernel.org, linux@armlinux.org.uk,
elver@google.com
Subject: Re: [PATCH v4 7/8] lockdep: Change hardirq{s_enabled,_context} to per-cpu variables
Date: Tue, 23 Jun 2020 18:37:30 +0200 [thread overview]
Message-ID: <20200623163730.GA4800@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20200623161320.GA2996373@debian-buster-darwi.lab.linutronix.de>
On Tue, Jun 23, 2020 at 06:13:21PM +0200, Ahmed S. Darwish wrote:
> Well, freshly merged code is using it. For example, KCSAN:
>
> => f1bc96210c6a ("kcsan: Make KCSAN compatible with lockdep")
> => kernel/kcsan/report.c:
>
> void kcsan_report(...)
> {
> ...
> /*
> * With TRACE_IRQFLAGS, lockdep's IRQ trace state becomes corrupted if
> * we do not turn off lockdep here; this could happen due to recursion
> * into lockdep via KCSAN if we detect a race in utilities used by
> * lockdep.
> */
> lockdep_off();
> ...
> }
Marco, do you remember what exactly happened there? Because I'm about to
wreck that. That is, I'm going to make TRACE_IRQFLAGS ignore
lockdep_off().
next prev parent reply other threads:[~2020-06-23 16:38 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-23 8:36 [PATCH v4 0/8] lockdep: Change IRQ state tracking to use per-cpu variables Peter Zijlstra
2020-06-23 8:36 ` [PATCH v4 1/8] lockdep: Prepare for NMI IRQ state tracking Peter Zijlstra
2020-07-11 10:09 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-06-23 8:36 ` [PATCH v4 2/8] x86/entry: Fix NMI vs " Peter Zijlstra
2020-07-11 10:09 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-06-23 8:36 ` [PATCH v4 3/8] sparc64: Fix asm/percpu.h build error Peter Zijlstra
2020-06-23 21:35 ` David Miller
2020-07-11 10:09 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-06-23 8:36 ` [PATCH v4 4/8] powerpc64: Break asm/percpu.h vs spinlock_types.h dependency Peter Zijlstra
2020-06-23 8:36 ` [PATCH v4 5/8] s390: Break cyclic percpu include Peter Zijlstra
2020-07-11 10:09 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-06-23 8:36 ` [PATCH v4 6/8] arm: " Peter Zijlstra
2020-06-23 9:02 ` Will Deacon
2020-06-24 17:53 ` Peter Zijlstra
2020-06-25 7:31 ` Will Deacon
2020-07-11 10:09 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-06-23 8:36 ` [PATCH v4 7/8] lockdep: Change hardirq{s_enabled,_context} to per-cpu variables Peter Zijlstra
2020-06-23 15:00 ` Ahmed S. Darwish
2020-06-23 15:24 ` Peter Zijlstra
2020-06-23 16:13 ` Ahmed S. Darwish
2020-06-23 16:37 ` Peter Zijlstra [this message]
2020-06-23 17:59 ` Marco Elver
2020-06-23 18:12 ` Peter Zijlstra
2020-06-23 18:39 ` Marco Elver
2020-06-23 19:13 ` Marco Elver
2020-06-23 19:41 ` Peter Zijlstra
2020-06-23 20:08 ` Peter Zijlstra
2020-06-23 20:24 ` Peter Zijlstra
2020-06-23 20:33 ` Peter Zijlstra
2020-06-24 9:00 ` Peter Zijlstra
2020-06-24 10:17 ` Marco Elver
2020-06-24 12:31 ` Peter Zijlstra
2020-06-24 11:32 ` Marco Elver
2020-06-24 15:18 ` Peter Zijlstra
2020-06-30 5:59 ` Ahmed S. Darwish
2020-06-30 9:40 ` Peter Zijlstra
2020-07-11 10:09 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2020-06-23 8:36 ` [PATCH v4 8/8] lockdep: Remove lockdep_hardirq{s_enabled,_context}() argument Peter Zijlstra
2020-07-11 10:09 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
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