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From: Marco Elver <elver@google.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"Ingo Molnar" <mingo@kernel.org>, "Will Deacon" <will@kernel.org>,
	"Nicholas Piggin" <npiggin@gmail.com>,
	"Jürgen Groß" <jgross@suse.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	rjw@rjwysocki.net, "Joel Fernandes" <joel@joelfernandes.org>,
	svens@linux.ibm.com, "Thomas Gleixner" <tglx@linutronix.de>
Subject: Re: [PATCH 0/9] TRACE_IRQFLAGS wreckage
Date: Fri, 21 Aug 2020 09:05:46 +0200	[thread overview]
Message-ID: <CANpmjNOnopd8usQJk0Y1mxSNrQ15e0GboNfwop4qUDCwMnQQZQ@mail.gmail.com> (raw)
In-Reply-To: <20200821065413.GG1362448@hirez.programming.kicks-ass.net>

On Fri, 21 Aug 2020 at 08:54, <peterz@infradead.org> wrote:
>
> On Thu, Aug 20, 2020 at 07:20:46PM +0200, Marco Elver wrote:
> > From 4ec9dd472c978e1eba622fb22bc04e4357f10421 Mon Sep 17 00:00:00 2001
> > From: Marco Elver <elver@google.com>
> > Date: Thu, 20 Aug 2020 19:06:09 +0200
> > Subject: [PATCH] sched: Turn inline into __always_inline due to noinstr use
> >
> > is_idle_task() may be used from noinstr functions such as
> > irqentry_enter(). Since the compiler is free to not inline regular
> > inline functions, switch to using __always_inline.
> >
> > Signed-off-by: Marco Elver <elver@google.com>
>
> Fair enough I suppose; didn't that generate an objtool warning on your
> build? (of course that requires PARAVIRT=n, I should get back to fixing
> that)

It does now after turning on VMLINUX_VALIDATION.

Although note that this patch (and the other, which I'll send
separately) wasn't required after the rcuidle fix. I suppose there is
still a small chance things can go wrong though, but syzkaller wasn't
able to find such a case (yet).

Thanks,
-- Marco

  reply	other threads:[~2020-08-21  7:06 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-20  7:30 [PATCH 0/9] TRACE_IRQFLAGS wreckage Peter Zijlstra
2020-08-20  7:30 ` [PATCH 1/9] lockdep: Use raw_cpu_*() for per-cpu variables Peter Zijlstra
2020-08-20 13:54   ` Steven Rostedt
2020-08-20  7:30 ` [PATCH 2/9] sched,idle,rcu: Push rcu_idle deeper into the idle path Peter Zijlstra
2020-08-20 13:58   ` Steven Rostedt
2020-08-20  7:30 ` [PATCH 3/9] cpuidle: Make CPUIDLE_FLAG_TLB_FLUSHED generic Peter Zijlstra
2020-08-20  7:30 ` [PATCH 4/9] cpuidle: Move trace_cpu_idle() into generic code Peter Zijlstra
2020-08-20  7:30 ` [PATCH 5/9] x86/entry: Remove unused THUNKs Peter Zijlstra
2020-08-20  7:30 ` [PATCH 6/9] locking/lockdep: Cleanup Peter Zijlstra
2020-08-20  7:30 ` [PATCH 7/9] nds32: Implement arch_irqs_disabled() Peter Zijlstra
2020-08-20  7:30 ` [PATCH 8/9] lockdep: Only trace IRQ edges Peter Zijlstra
2020-08-20  7:30 ` [PATCH 9/9] lockdep,trace: Expose tracepoints Peter Zijlstra
2020-08-20 14:36 ` [PATCH 0/9] TRACE_IRQFLAGS wreckage Steven Rostedt
2020-08-20 14:39   ` Steven Rostedt
2020-08-20 14:49   ` Marco Elver
2020-08-20 14:58   ` peterz
2020-08-20 16:53     ` Steven Rostedt
2020-08-20 17:20     ` Marco Elver
2020-08-20 19:59       ` Steven Rostedt
2020-08-21  6:37         ` Marco Elver
2020-08-21  6:54       ` peterz
2020-08-21  7:05         ` Marco Elver [this message]
2020-08-27  7:54       ` [tip: sched/urgent] sched: Use __always_inline on is_idle_task() tip-bot2 for Marco Elver

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