linux-kernel - [PATCH v12 24/84] KVM: Use plain "struct page" pointer instead of single-entry array

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Message-ID: <20240726235234.228822-25-seanjc@google.com>
Date: Fri, 26 Jul 2024 16:51:33 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, Tianrui Zhao <zhaotianrui@...ngson.cn>, 
	Bibo Mao <maobibo@...ngson.cn>, Huacai Chen <chenhuacai@...nel.org>, 
	Michael Ellerman <mpe@...erman.id.au>, Anup Patel <anup@...infault.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, 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>, 
	Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, 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, 
	David Matlack <dmatlack@...gle.com>, David Stevens <stevensd@...omium.org>
Subject: [PATCH v12 24/84] KVM: Use plain "struct page" pointer instead of
 single-entry array

Use a single pointer instead of a single-entry array for the struct page
pointer in hva_to_pfn_fast().  Using an array makes the code unnecessarily
annoying to read and update.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 virt/kvm/kvm_main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 3d717a131906..8e83d3f043f1 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2763,7 +2763,7 @@ static inline int check_user_page_hwpoison(unsigned long addr)
  */
 static bool hva_to_pfn_fast(struct kvm_follow_pfn *kfp, kvm_pfn_t *pfn)
 {
-	struct page *page[1];
+	struct page *page;
 
 	/*
 	 * Fast pin a writable pfn only if it is a write fault request
@@ -2773,8 +2773,8 @@ static bool hva_to_pfn_fast(struct kvm_follow_pfn *kfp, kvm_pfn_t *pfn)
 	if (!((kfp->flags & FOLL_WRITE) || kfp->map_writable))
 		return false;
 
-	if (get_user_page_fast_only(kfp->hva, FOLL_WRITE, page)) {
-		*pfn = page_to_pfn(page[0]);
+	if (get_user_page_fast_only(kfp->hva, FOLL_WRITE, &page)) {
+		*pfn = page_to_pfn(page);
 		if (kfp->map_writable)
 			*kfp->map_writable = true;
 		return true;
-- 
2.46.0.rc1.232.g9752f9e123-goog