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[104.57.70.139]) by smtp.googlemail.com with ESMTPSA id 5a478bee46e88-2b7a1adef97sm20129902eec.29.2026.02.02.09.20.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Feb 2026 09:20:19 -0800 (PST) From: "Vishal Moola (Oracle)" To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, "Mike Rapoport (Microsoft)" Cc: akpm@linux-foundation.org, "Matthew Wilcox (Oracle)" , Dave Hansen , Andy Lutomirski , Peter Zijlstra , "Vishal Moola (Oracle)" Subject: [PATCH v3 1/3] x86/mm/pat: Convert pte code to use ptdescs Date: Mon, 2 Feb 2026 09:20:03 -0800 Message-ID: <20260202172005.683870-2-vishal.moola@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260202172005.683870-1-vishal.moola@gmail.com> References: <20260202172005.683870-1-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. Convert these pte allocation/free sites to use ptdescs. Signed-off-by: Vishal Moola (Oracle) --- arch/x86/mm/pat/set_memory.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 6c6eb486f7a6..f9f9d4ca8e71 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -1408,7 +1408,7 @@ static bool try_to_free_pte_page(pte_t *pte) if (!pte_none(pte[i])) return false; =20 - free_page((unsigned long)pte); + pagetable_free(virt_to_ptdesc((void *)pte)); return true; } =20 @@ -1537,12 +1537,15 @@ static void unmap_pud_range(p4d_t *p4d, unsigned lo= ng start, unsigned long end) */ } =20 -static int alloc_pte_page(pmd_t *pmd) +static int alloc_pte_ptdesc(pmd_t *pmd) { - pte_t *pte =3D (pte_t *)get_zeroed_page(GFP_KERNEL); - if (!pte) + pte_t *pte; + struct ptdesc *ptdesc =3D pagetable_alloc(GFP_KERNEL | __GFP_ZERO, 0); + + if (!ptdesc) return -1; =20 + pte =3D (pte_t *) ptdesc_address(ptdesc); set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE)); return 0; } @@ -1600,7 +1603,7 @@ static long populate_pmd(struct cpa_data *cpa, */ pmd =3D pmd_offset(pud, start); if (pmd_none(*pmd)) - if (alloc_pte_page(pmd)) + if (alloc_pte_ptdesc(pmd)) return -1; =20 populate_pte(cpa, start, pre_end, cur_pages, pmd, pgprot); @@ -1641,7 +1644,7 @@ static long populate_pmd(struct cpa_data *cpa, if (start < end) { pmd =3D pmd_offset(pud, start); if (pmd_none(*pmd)) - if (alloc_pte_page(pmd)) + if (alloc_pte_ptdesc(pmd)) return -1; =20 populate_pte(cpa, start, end, num_pages - cur_pages, --=20 2.52.0