linux-kernel - Re: [PATCH] KVM: Remove subtle "struct kvm_stats

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Message-ID: <865xahp854.wl-maz@kernel.org>
Date: Mon, 08 Dec 2025 10:42:15 +0000
From: Marc Zyngier <maz@...nel.org>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Oliver Upton <oupton@...nel.org>,
	Tianrui Zhao <zhaotianrui@...ngson.cn>,
	Bibo Mao <maobibo@...ngson.cn>,
	Huacai Chen <chenhuacai@...nel.org>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Anup Patel <anup@...infault.org>,
	Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-mips@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	kvm-riscv@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	"Gustavo A . R . Silva" <gustavoars@...nel.org>
Subject: Re: [PATCH] KVM: Remove subtle "struct kvm_stats_desc" pseudo-overlay

On Fri, 05 Dec 2025 23:26:55 +0000,
Sean Christopherson <seanjc@...gle.com> wrote:
> 
> Remove KVM's internal pseudo-overlay of kvm_stats_desc, which subtly
> aliases the flexible name[] in the uAPI definition with a fixed-size array
> of the same name.  The unusual embedded structure results in compiler
> warnings due to -Wflex-array-member-not-at-end, and also necessitates an
> extra level of dereferencing in KVM.  To avoid the "overlay", define the
> uAPI structure to have a fixed-size name when building for the kernel.
> 
> Opportunistically clean up the indentation for the stats macros, and
> replace spaces with tabs.
> 
> No functional change intended.
> 
> Reported-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> Closes: https://lore.kernel.org/all/aPfNKRpLfhmhYqfP@kspp
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Acked-by: Marc Zyngier <maz@...nel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.