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[2003:cb:c704:4900:849b:f76e:5e1f:ff95]) by smtp.gmail.com with ESMTPSA id a1-20020a056000188100b002041a652dfdsm1639674wri.25.2022.03.21.05.01.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Mar 2022 05:01:45 -0700 (PDT) Message-ID: Date: Mon, 21 Mar 2022 13:01:44 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.6.2 Subject: Re: [RFC 2/3] mm: export zap_page_range() To: Xiaoguang Wang , linux-mm@kvack.org, target-devel@vger.kernel.org, linux-scsi@vger.kernel.org Cc: linux-block@vger.kernel.org, xuyu@linux.alibaba.com, bostroesser@gmail.com References: <20220318095531.15479-1-xiaoguang.wang@linux.alibaba.com> <20220318095531.15479-3-xiaoguang.wang@linux.alibaba.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20220318095531.15479-3-xiaoguang.wang@linux.alibaba.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: CA57E4003F X-Rspam-User: Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=LYU22dH6; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf12.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 170.10.129.124) smtp.mailfrom=david@redhat.com X-Stat-Signature: 9k6tm84didtxetbx83w8t56huggf1cew X-Rspamd-Server: rspam04 X-HE-Tag: 1647864110-496331 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: On 18.03.22 10:55, Xiaoguang Wang wrote: > Module target_core_user will use it to implement zero copy feature. > > Signed-off-by: Xiaoguang Wang > --- > mm/memory.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/mm/memory.c b/mm/memory.c > index 1f745e4d11c2..9974d0406dad 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -1664,6 +1664,7 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start, > mmu_notifier_invalidate_range_end(&range); > tlb_finish_mmu(&tlb); > } > +EXPORT_SYMBOL_GPL(zap_page_range); > > /** > * zap_page_range_single - remove user pages in a given range To which VMAs will you be applying zap_page_range? I assume only to some special ones where you previously vm_insert_page(s)_mkspecial'ed pages, not to some otherwise random VMAs, correct? -- Thanks, David / dhildenb