linux-kernel - Re: [PATCH 5/5] x86/pkeys: Standardize on u8 for pkey type

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Date:   Mon, 14 Mar 2022 16:49:12 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     ira.weiny@...el.com, Dave Hansen <dave.hansen@...ux.intel.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Cc:     "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] x86/pkeys: Standardize on u8 for pkey type

On 3/10/22 16:57, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> The number of pkeys supported on x86 and powerpc are much smaller than a
> u16 value can hold.  It is desirable to standardize on the type for
> pkeys.  powerpc currently supports the most pkeys at 32.  u8 is plenty
> large for that.
> 
> Standardize on the pkey types by changing u16 to u8.

How widely was this intended to "standardize" things?  Looks like it may
have missed a few spots.

Also if we're worried about the type needing to change or with the wrong
type being used, I guess we could just to a pkey_t typedef.