From: peterz@infradead.org
To: Nicholas Piggin <npiggin@gmail.com>
Cc: linux-arch@vger.kernel.org, Alexey Kardashevskiy <aik@ozlabs.ru>,
Will Deacon <will@kernel.org>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 1/2] lockdep: improve current->(hard|soft)irqs_enabled synchronisation with actual irq state
Date: Wed, 12 Aug 2020 12:35:30 +0200 [thread overview]
Message-ID: <20200812103530.GL2674@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1597220073.mbvcty6ghk.astroid@bobo.none>
On Wed, Aug 12, 2020 at 06:18:28PM +1000, Nicholas Piggin wrote:
> Excerpts from peterz@infradead.org's message of August 7, 2020 9:11 pm:
> >
> > What's wrong with something like this?
> >
> > AFAICT there's no reason to actually try and add IRQ tracing here, it's
> > just a hand full of instructions at the most.
>
> Because we may want to use that in other places as well, so it would
> be nice to have tracing.
>
> Hmm... also, I thought NMI context was free to call local_irq_save/restore
> anyway so the bug would still be there in those cases?
NMI code has in_nmi() true, in which case the IRQ tracing is disabled
(except for x86 which has CONFIG_TRACE_IRQFLAGS_NMI).
next prev parent reply other threads:[~2020-08-12 10:39 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-23 10:56 [PATCH 1/2] lockdep: improve current->(hard|soft)irqs_enabled synchronisation with actual irq state Nicholas Piggin
2020-07-23 10:56 ` [PATCH 2/2] lockdep: warn on redundant or incorrect irq state changes Nicholas Piggin
2020-07-24 2:57 ` kernel test robot
2020-08-04 10:00 ` Alexey Kardashevskiy
2020-07-23 11:40 ` [PATCH 1/2] lockdep: improve current->(hard|soft)irqs_enabled synchronisation with actual irq state Peter Zijlstra
2020-07-23 13:11 ` Nicholas Piggin
2020-07-23 14:59 ` Peter Zijlstra
2020-07-23 16:20 ` Nicholas Piggin
2020-07-24 4:16 ` Alexey Kardashevskiy
2020-07-24 5:59 ` Nicholas Piggin
2020-07-26 7:40 ` Alexey Kardashevskiy
2020-07-24 6:16 ` Athira Rajeev
2020-07-24 2:19 ` kernel test robot
2020-07-24 3:15 ` kernel test robot
2020-07-25 20:26 ` Peter Zijlstra
2020-07-26 4:14 ` Nicholas Piggin
2020-07-26 11:59 ` peterz
2020-07-26 12:11 ` peterz
2020-07-28 11:22 ` Nicholas Piggin
2020-08-07 11:11 ` peterz
2020-08-12 8:18 ` Nicholas Piggin
2020-08-12 10:35 ` peterz [this message]
2020-08-18 7:22 ` Nicholas Piggin
2020-08-18 15:41 ` peterz
2020-08-18 23:54 ` Nicholas Piggin
2020-08-19 10:39 ` Alexey Kardashevskiy
2020-08-19 15:32 ` peterz
2020-08-19 15:39 ` peterz
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