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Date:   Sat, 09 May 2020 12:16:07 +0200
From:   Thomas Gleixner <>
To:     Andy Lutomirski <>
Cc:     LKML <>, X86 ML <>,
        "Paul E. McKenney" <>,
        Andy Lutomirski <>,
        Alexandre Chartre <>,
        Frederic Weisbecker <>,
        Paolo Bonzini <>,
        Sean Christopherson <>,
        Masami Hiramatsu <>,
        Petr Mladek <>,
        Steven Rostedt <>,
        Joel Fernandes <>,
        Boris Ostrovsky <>,
        Juergen Gross <>,
        Brian Gerst <>,
        Mathieu Desnoyers <>,
        Josh Poimboeuf <>,
        Will Deacon <>
Subject: Re: [patch V4 part 2 06/18] x86/entry: Move irq flags tracing to prepare_exit_to_usermode()

Andy Lutomirski <> writes:
> On Tue, May 5, 2020 at 7:14 AM Thomas Gleixner <> wrote:
>> This is another step towards more C-code and less convoluted ASM.
>> Similar to the entry path, invoke the tracer before context tracking which
>> might turn off RCU and invoke lockdep as the last step before going back to
>> user space. Annotate the code sections in exit_to_user_mode() accordingly
>> so objtool won't complain about the tracer invocation.
> Acked-by: Andy Lutomirski <>
> Note to self: the nmi code needs to be reworked to go through
> prepare_exit_to_usermode(), too.  I'll do this once this whole pile
> lands.

Why? NMI does not set any work stuff or preemption. If something needs
to be done then NMI raises irq_work which uses the regular path.



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