linux-kernel - Re: [RFC PATCH 3/3] x86/mm: cleanup prctl_enable_tagged_addr() nr

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Date: Thu, 7 Mar 2024 19:31:44 +0200
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Yosry Ahmed <yosryahmed@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...el.com>, Peter Zijlstra <peterz@...radead.org>, 
	Andy Lutomirski <luto@...nel.org>, x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/3] x86/mm: cleanup prctl_enable_tagged_addr()
 nr_bits error checking

On Thu, Mar 07, 2024 at 01:39:16PM +0000, Yosry Ahmed wrote:
> In prctl_enable_tagged_addr(), we check that nr_bits is in the correct
> range, but we do so in a twisted if/else block where the correct case is
> sandwiched between two error cases doing exactly the same thing.
> 
> Simplify the if condition and pull the correct case outside with the
> rest of the success code path.

I'm okay either way.

I structured the code this way as I had separate patch that adds also
LAM_U48. But it is unlikely to get upstreamed.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov