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[67.164.59.41]) by smtp.googlemail.com with ESMTPSA id 5a478bee46e88-2b7a1abe57csm5439115eec.22.2026.01.28.14.41.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jan 2026 14:41:05 -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 v2 2/3] x86/mm/pat: Convert pmd code to use ptdescs Date: Wed, 28 Jan 2026 14:40:48 -0800 Message-ID: <20260128224049.385013-3-vishal.moola@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260128224049.385013-1-vishal.moola@gmail.com> References: <20260128224049.385013-1-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 pmd allocation/free sites to use ptdescs. populate_pgd() also allocates pagetables that may later be freed by try_to_free_pmd_page(), so allocate ptdescs there as well. Signed-off-by: Vishal Moola (Oracle) --- arch/x86/mm/pat/set_memory.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 2dcb565d8f9b..ee3d0067aeea 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -1420,7 +1420,7 @@ static bool try_to_free_pmd_page(pmd_t *pmd) if (!pmd_none(pmd[i])) return false; =20 - free_page((unsigned long)pmd); + pagetable_free(virt_to_ptdesc((void *)pmd)); return true; } =20 @@ -1548,9 +1548,10 @@ static int alloc_pte_ptdesc(pmd_t *pmd) return 0; } =20 -static int alloc_pmd_page(pud_t *pud) +static int alloc_pmd_ptdesc(pud_t *pud) { - pmd_t *pmd =3D (pmd_t *)get_zeroed_page(GFP_KERNEL); + pmd_t *pmd =3D (pmd_t *) ptdesc_address( + pagetable_alloc(GFP_KERNEL | __GFP_ZERO, 0)); if (!pmd) return -1; =20 @@ -1623,7 +1624,7 @@ static long populate_pmd(struct cpa_data *cpa, * We cannot use a 1G page so allocate a PMD page if needed. */ if (pud_none(*pud)) - if (alloc_pmd_page(pud)) + if (alloc_pmd_ptdesc(pud)) return -1; =20 pmd =3D pmd_offset(pud, start); @@ -1679,7 +1680,7 @@ static int populate_pud(struct cpa_data *cpa, unsigne= d long start, p4d_t *p4d, * Need a PMD page? */ if (pud_none(*pud)) - if (alloc_pmd_page(pud)) + if (alloc_pmd_ptdesc(pud)) return -1; =20 cur_pages =3D populate_pmd(cpa, start, pre_end, cur_pages, @@ -1716,7 +1717,7 @@ static int populate_pud(struct cpa_data *cpa, unsigne= d long start, p4d_t *p4d, =20 pud =3D pud_offset(p4d, start); if (pud_none(*pud)) - if (alloc_pmd_page(pud)) + if (alloc_pmd_ptdesc(pud)) return -1; =20 tmp =3D populate_pmd(cpa, start, end, cpa->numpages - cur_pages, @@ -1744,7 +1745,8 @@ static int populate_pgd(struct cpa_data *cpa, unsigne= d long addr) pgd_entry =3D cpa->pgd + pgd_index(addr); =20 if (pgd_none(*pgd_entry)) { - p4d =3D (p4d_t *)get_zeroed_page(GFP_KERNEL); + p4d =3D (p4d_t *) ptdesc_address( + pagetable_alloc(GFP_KERNEL | __GFP_ZERO, 0)); if (!p4d) return -1; =20 @@ -1756,7 +1758,8 @@ static int populate_pgd(struct cpa_data *cpa, unsigne= d long addr) */ p4d =3D p4d_offset(pgd_entry, addr); if (p4d_none(*p4d)) { - pud =3D (pud_t *)get_zeroed_page(GFP_KERNEL); + pud =3D (pud_t *) ptdesc_address( + pagetable_alloc(GFP_KERNEL | __GFP_ZERO, 0)); if (!pud) return -1; =20 --=20 2.52.0