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[67.164.59.41]) by smtp.googlemail.com with ESMTPSA id a92af1059eb24-126f4e0f98asm3424982c88.5.2026.02.04.17.35.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Feb 2026 17:35:52 -0800 (PST) From: "Vishal Moola (Oracle)" To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, "Mike Rapoport (Microsoft)" , Dave Hansen Cc: akpm@linux-foundation.org, "Matthew Wilcox (Oracle)" , Andy Lutomirski , Peter Zijlstra , "Vishal Moola (Oracle)" Subject: [PATCH v4 4/4] x86/mm/pat: Convert split_large_page() to use ptdescs Date: Wed, 4 Feb 2026 17:35:27 -0800 Message-ID: <20260205013527.322157-5-vishal.moola@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260205013527.322157-1-vishal.moola@gmail.com> References: <20260205013527.322157-1-vishal.moola@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In order to separately allocate ptdescs from pages, we need all allocation and free sites to use the appropriate functions. split_large_page() allocates a page to be used as a page table. This should be allocating a ptdesc, so convert it. Signed-off-by: Vishal Moola (Oracle) Acked-by: Mike Rapoport (Microsoft) --- arch/x86/mm/pat/set_memory.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index dfe05cdf460c..dd17034a3c58 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -1119,9 +1119,10 @@ static void split_set_pte(struct cpa_data *cpa, pte_= t *pte, unsigned long pfn, =20 static int __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long addres= s, - struct page *base) + struct ptdesc *ptdesc) { unsigned long lpaddr, lpinc, ref_pfn, pfn, pfninc =3D 1; + struct page *base =3D ptdesc_page(ptdesc); pte_t *pbase =3D (pte_t *)page_address(base); unsigned int i, level; pgprot_t ref_prot; @@ -1226,18 +1227,18 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpt= e, unsigned long address, static int split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address) { - struct page *base; + struct ptdesc *ptdesc; =20 if (!debug_pagealloc_enabled()) spin_unlock(&cpa_lock); - base =3D alloc_pages(GFP_KERNEL, 0); + ptdesc =3D pagetable_alloc(GFP_KERNEL, 0); if (!debug_pagealloc_enabled()) spin_lock(&cpa_lock); - if (!base) + if (!ptdesc) return -ENOMEM; =20 - if (__split_large_page(cpa, kpte, address, base)) - __free_page(base); + if (__split_large_page(cpa, kpte, address, ptdesc)) + pagetable_free(ptdesc); =20 return 0; } --=20 2.52.0