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h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IVRIV9T1flpA0gOrme1V1eRRplwrh4TOVZQ26715JQXP4QS1CmEmFLuEQckZtZvv4 4p+gq0ht2Chb+NH1sjxzNiEzIZeyEPeVbwJ1KM74ZeocLv5XHo0v7Uh1Lze0qxAo+P JXkmUcVeya83Vz4L/uprN4mXjJ5dFsFizk8SHMNA= From: Yeoreum Yun To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, x86@kernel.org, linux-mm@kvack.org, kasan-dev@googlegroups.com, linux-csky@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org Cc: david@kernel.org, linux@armlinux.org.uk, akpm@linux-foundation.org, ankur.a.arora@oracle.com, rppt@kernel.org, linmag7@gmail.com, chleroy@kernel.org, klarasmodin@gmail.com, chenhuacai@kernel.org, kernel@xen0n.name, kas@kernel.org, zhangtianyang@loongson.cn, wangyuli@aosc.io, tsbogend@alpha.franken.de, ljs@kernel.org, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, ryan.roberts@arm.com, pasha.tatashin@soleen.com, rmclure@linux.ibm.com, baolin.wang@linux.alibaba.com, tj@kernel.org, kevin.brodsky@arm.com, anup@brainfault.org, atish.patra@linux.dev, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, hannes@cmpxchg.org, mhocko@kernel.org, qi.zheng@linux.dev, shakeel.butt@linux.dev, kasong@tencent.com, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, anshuman.khandual@arm.com, yang@os.amperecomputing.com, chaitanyas.prakash@arm.com, ardb@kernel.org, guoren@kernel.org, yang.li85200@gmail.com, viro@zeniv.linux.org.uk, dinguyen@kernel.org, schuster.simon@siemens-energy.com, wangruikang@iscas.ac.cn, junhui.liu@pigmoral.tech, muchun.song@linux.dev, vishal.moola@gmail.com, namcao@linutronix.de, pavel@kernel.org, djbw@kernel.org, yu-cheng.yu@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, coxu@redhat.com, andreas@gaisler.com, liam@infradead.org, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, geert@linux-m68k.org, shorne@gmail.com, jonas@southpole.se, stefan.kristiansson@saunalahti.fi, Yeoreum Yun Subject: [RFC PATCH 24/34] x86: mm: call try_to_free_pmd_page() when CONFIG_PGTABLE_LEVELS > 2 Date: Mon, 13 Jul 2026 14:56:03 +0100 Message-ID: <20260713135614.1618183-25-yeoreum.yun@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260713135614.1618183-1-yeoreum.yun@arm.com> References: <20260713135614.1618183-1-yeoreum.yun@arm.com> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit We want to rework how pgd_page_vaddr() behaves for generic compile-time folded page tables by disallowing its use and triggering a compile-time error when it is used improperly, ensuring that the actual first-level pXd_pgtable() function is used instead. The try_to_free_pmd_page() wouldn't need to call when CONFIG_PGTABLE_LEVELS=2. therefore call it when CONFIG_PGTABLE_LEVELS > 2. There should be no functional change. Signed-off-by: Yeoreum Yun --- arch/x86/mm/pat/set_memory.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index cffb1cef869cc..2137174b733ae 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -1452,7 +1452,7 @@ static bool unmap_pte_range(pmd_t *pmd, unsigned long start, unsigned long end) static void __unmap_pmd_range(pud_t *pud, pmd_t *pmd, unsigned long start, unsigned long end) { - if (unmap_pte_range(pmd, start, end)) + if (unmap_pte_range(pmd, start, end) && CONFIG_PGTABLE_LEVELS > 2) if (try_to_free_pmd_page(pud_pgtable(*pud))) pud_clear(pud); } @@ -1496,7 +1496,7 @@ static void unmap_pmd_range(pud_t *pud, unsigned long start, unsigned long end) /* * Try again to free the PMD page if haven't succeeded above. */ - if (!pud_none(*pud)) + if (!pud_none(*pud) && CONFIG_PGTABLE_LEVELS > 2) if (try_to_free_pmd_page(pud_pgtable(*pud))) pud_clear(pud); } -- LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}