linux-kernel - Re: [PATCH v3 3/3] x86: Zap TOP_OF_KERNEL_STACK_PADDING on x86

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Message-ID: <8b920da6-0c9a-43b4-bd50-79c057a01932@zytor.com>
Date: Thu, 20 Mar 2025 22:47:25 -0700
From: Xin Li <xin@...or.com>
To: Brian Gerst <brgerst@...il.com>
Cc: linux-kernel@...r.kernel.org, luto@...nel.org, tglx@...utronix.de,
        mingo@...nel.org, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, peterz@...radead.org
Subject: Re: [PATCH v3 3/3] x86: Zap TOP_OF_KERNEL_STACK_PADDING on x86_64

On 3/19/2025 12:17 PM, Brian Gerst wrote:
> I'm not sure it's worth fully removing TOP_OF_KERNEL_STACK_PADDING for
> 64-bit if it results in needing separate definitions of
> task_top_of_stack().  Leaving it at zero is fine.  The other changes
> are fine though.

Let's leave it to x86 maintainers ;-)

But to me, TOP_OF_KERNEL_STACK_PADDING no longer makes sense on 64-bit,
and it makes it simpler to remove it.  On the other side, 32-bit is to
be zapped...

Thanks!
     Xin