linux-kernel - Re: [PATCH 2/3] rcu: Fix rcu_dynticks_curr_cpu_in

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Date:   Wed, 29 Sep 2021 00:35:54 +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 2/3] rcu: Fix rcu_dynticks_curr_cpu_in_eqs() vs noinstr

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

>   vmlinux.o: warning: objtool: rcu_nmi_enter()+0x36: call to __kasan_check_read() leaves .noinstr.text section
>
> noinstr cannot have atomic_*() functions in because they're explicitly
> annotated, use arch_atomic_*().
>
> Fixes: 2be57f732889 ("rcu: Weaken ->dynticks accesses and updates")
> 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>