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[202.108.7.214]) by mx.google.com with SMTP id m4si22367613pgv.57.2019.07.27.02.22.40 for ; Sat, 27 Jul 2019 02:22:41 -0700 (PDT) Received-SPF: pass (google.com: domain of hdanton@sina.com designates 202.108.7.214 as permitted sender) client-ip=202.108.7.214; Authentication-Results: mx.google.com; spf=pass (google.com: domain of hdanton@sina.com designates 202.108.7.214 as permitted sender) smtp.mailfrom=hdanton@sina.com Received: from unknown (HELO localhost.localdomain)([222.131.77.31]) by sina.com with ESMTP id 5D3C17DC00003E9B; Sat, 27 Jul 2019 17:22:39 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com X-SMAIL-MID: 35439950202192 From: Hillf Danton To: Bharath Vedartham Cc: sivanich@sgi.com, arnd@arndb.de, ira.weiny@intel.com, jhubbard@nvidia.com, jglisse@redhat.com, gregkh@linuxfoundation.org, william.kucharski@oracle.com, hch@lst.de, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v3 1/1] sgi-gru: Remove *pte_lookup functions Date: Sat, 27 Jul 2019 17:22:28 +0800 Message-Id: <1564170120-11882-2-git-send-email-linux.bhar@gmail.com> In-Reply-To: <1564170120-11882-1-git-send-email-linux.bhar@gmail.com> References: <1564170120-11882-1-git-send-email-linux.bhar@gmail.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Archived-At: List-Archive: List-Post: Content-Transfer-Encoding: 8bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Message-ID: <20190727092228.XllsRDGhGOyPEWHo58xPSCPro1CpujN2jTCLitTC_pk@z> On Fri, 26 Jul 2019 12:42:26 -0700 (PDT) Bharath Vedartham wrote: > > static int gru_vtop(struct gru_thread_state *gts, unsigned long vaddr, > int write, int atomic, unsigned long *gpa, int *pageshift) > { > struct mm_struct *mm = gts->ts_mm; > struct vm_area_struct *vma; > unsigned long paddr; > - int ret, ps; > + int ret; > + struct page *page; > > vma = find_vma(mm, vaddr); > if (!vma) > @@ -263,21 +187,33 @@ static int gru_vtop(struct gru_thread_state *gts, unsigned long vaddr, > > /* > * Atomic lookup is faster & usually works even if called in non-atomic > - * context. > + * context. get_user_pages_fast does atomic lookup before falling back to > + * slow gup. > */ > rmb(); /* Must/check ms_range_active before loading PTEs */ > - ret = atomic_pte_lookup(vma, vaddr, write, &paddr, &ps); > - if (ret) { > - if (atomic) > + if (atomic) { > + ret = __get_user_pages_fast(vaddr, 1, write, &page); > + if (!ret) > goto upm; > - if (non_atomic_pte_lookup(vma, vaddr, write, &paddr, &ps)) > + } else { > + ret = get_user_pages_fast(vaddr, 1, write, &page); > + if (!ret) > goto inval; > } > + > + paddr = page_to_phys(page); You may drop find_vma() above if PageHuge(page) makes sense here. > + put_user_page(page); > + > + if (unlikely(is_vm_hugetlb_page(vma))) > + *pageshift = HPAGE_SHIFT; > + else > + *pageshift = PAGE_SHIFT; > + > if (is_gru_paddr(paddr)) > goto inval; > - paddr = paddr & ~((1UL << ps) - 1); > - *gpa = uv_soc_phys_ram_to_gpa(paddr); > - *pageshift = ps; > + paddr = paddr & ~((1UL << *pageshift) - 1); > + *gpa = uv_soc_phys_ram_to_gpa(paddr); > + > return VTOP_SUCCESS; > > inval: > -- > 2.7.4