linux-kernel - Re: [PATCH 1/3] rcu: Always inline rcu_dynticks_task*

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Message-ID: <87ee989vml.ffs@tglx>
Date:   Wed, 29 Sep 2021 00:35:14 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>, paulmck@...nel.org,
        sfr@...b.auug.org.au
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: Re: [PATCH 1/3] rcu: Always inline rcu_dynticks_task*_{enter,exit}()

On Tue, Sep 28 2021 at 10:40, Peter Zijlstra wrote:

> RCU managed to grow a few noinstr violations:
>
>   vmlinux.o: warning: objtool: rcu_dynticks_eqs_enter()+0x0: call to rcu_dynticks_task_trace_enter() leaves .noinstr.text section
>   vmlinux.o: warning: objtool: rcu_dynticks_eqs_exit()+0xe: call to rcu_dynticks_task_trace_exit() leaves .noinstr.text section
>
> Fix them by adding __always_inline to the relevant trivial functions.
>
> Also replace the noinstr with __always_inline for the existing
> rcu_dynticks_task_*() functions since noinstr would force noinline
> them, even when empty, which seems silly.
>
> Fixes: 7d0c9c50c5a1 ("rcu-tasks: Avoid IPIing userspace/idle tasks if kernel is so built")
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>