linux-kernel - Re: [PATCH v2 3/8] powerpc/debug: implement HAVE_USER_RETURN

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Message-ID: <874j4bmxx6.ffs@tglx>
Date: Wed, 13 Nov 2024 07:48:37 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Luming Yu <luming.yu@...ngroup.cn>, linuxppc-dev@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org, mpe@...erman.id.au, npiggin@...il.com,
 christophe.leroy@...roup.eu, luming.yu@...il.com
Cc: Luming Yu <luming.yu@...ngroup.cn>
Subject: Re: [PATCH v2 3/8] powerpc/debug: implement HAVE_USER_RETURN_NOTIFIER

On Mon, Nov 11 2024 at 11:19, Luming Yu wrote:
> enable the common entry of user return notifier for powerpc as
> a debug feature.

What's the debug feature?

There are ZERO user return notifiers registered in PowerPC, so your
"debug feature" is just a waste of CPU cycles.

Thanks,

        tglx