linux-kernel - Re: [PATCH] KVM: s390: rename PROT_NONE to PROT_TYPE

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Message-ID: <b0e6ba16-9313-4e43-88db-c0b266f873e9@kuka.com>
Date: Thu, 15 May 2025 09:15:11 +0200
From: Ignacio Moreno Gonzalez <Ignacio.MorenoGonzalez@...a.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>, linux-mm@...ck.org,
 Yang Shi <yang@...amperecomputing.com>, Janosch Frank
 <frankja@...ux.ibm.com>, David Hildenbrand <david@...hat.com>,
 Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
 Alexander Gordeev <agordeev@...ux.ibm.com>,
 Sven Schnelle <svens@...ux.ibm.com>, kvm@...r.kernel.org,
 linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org, pbonzini@...hat.com
Subject: Re: [PATCH] KVM: s390: rename PROT_NONE to PROT_TYPE_DUMMY


On 5/14/2025 6:35 PM, Lorenzo Stoakes wrote:
> Caution! This message was sent from outside of KUKA. Please do not click links or open attachments unless you are certain of their authenticity.
>
> The enum type prot_type declared in arch/s390/kvm/gaccess.c declares an
> unfortunate identifier within it - PROT_NONE.
>
> This clashes with the protection bit define from the uapi for mmap()
> declared in include/uapi/asm-generic/mman-common.h, which is indeed what
> those casually reading this code would assume this to refer to.
>
> This means that any changes which subsequently alter headers in any way
> which results in the uapi header being imported here will cause build
> errors.
>
> Resolve the issue by renaming PROT_NONE to PROT_TYPE_DUMMY.
>
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> Suggested-by: Ignacio Moreno Gonzalez <Ignacio.MorenoGonzalez@...a.com>
> Fixes: b3cefd6bf16e ("KVM: s390: Pass initialized arg even if unused")
> Cc: stable@...r.kernel.org
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202505140943.IgHDa9s7-lkp@intel.com/
> ---
>
> Andrew - sorry to be a pain - this needs to land before
> https://lore.kernel.org/all/20250508-madvise-nohugepage-noop-without-thp-v1-1-e7ceffb197f3@kuka.com/
>
> I can resend this as a series with it if that makes it easier for you? Let
> me know if there's anything I can do to make it easier to get the ordering right here.
>
> Thanks!

Acked-by: Ignacio Moreno Gonzalez <Ignacio.MorenoGonzalez@...a.com>