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Shutemov" , "Peter Zijlstra (Intel)" Cc: "Rick P Edgecombe" , "Linux Kernel Mailing List" , "H.J. Lu" , "linux-mm@kvack.org" , "Dave Hansen" , "andreyknvl@gmail.com" , "kcc@google.com" , "Andi Kleen" , "dvyukov@google.com" , "the arch/x86 maintainers" , "ryabinin.a.a@gmail.com" , "glider@google.com" Subject: Re: [PATCHv3 6/8] x86/mm: Provide ARCH_GET_UNTAG_MASK and ARCH_ENABLE_TAGGED_ADDR Content-Type: text/plain ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1656554691; a=rsa-sha256; cv=none; b=3ndXJGV52GQIK0iynw5NASo7EDR7cRPYauUcybIXb7nDb9VO0TM3z9PpqMirxOsrB8pvBN jrjy0xoZZmpil+IxDVOLBQotSI/7BRz3qLjMGwo/uww4Do3RFqR1s0KaCsO59WUHJ224H/ 5aQtatTfZn+PvF+wxw4BuWI6RjDACC8= ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=KhGs07lK; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf13.hostedemail.com: domain of luto@kernel.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=luto@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1656554691; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=z4/lO8n6r/nJZkfF9OvqLGkPjVlh2L5bOQX4gRrUfy4=; b=nHrLHSkPvJvJa08mh1RX7nxRnqmVwcsrCT46v90mYFh9/ss5kveVR16Y7wNQCdq/pySUuZ scof8XkROgFTB4o9WcgYc4hUnhQZLAk8RGwVfkaDvTZ4URFT1qrG7YB/aVPpikEMCyiW4N YHrUwYl0F4UIBwd1G3Sts+5TD2+17mc= X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 1BEEA20033 Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=KhGs07lK; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf13.hostedemail.com: domain of luto@kernel.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=luto@kernel.org X-Rspam-User: X-Stat-Signature: 1a9szsukpifpm7nk51fo1fjsooz34c1w X-HE-Tag: 1656554690-736616 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 Thu, Jun 16, 2022, at 9:54 AM, Kirill A. Shutemov wrote: > On Thu, Jun 16, 2022 at 11:44:59AM +0200, Peter Zijlstra wrote: >> > get_nr_threads() is the wrong thing. Either look at mm->mm_users or >> > find a way to get rid of this restriction entirely. >> >> mm->mm_users should indeed be sufficient here. > > Hm. kthread_use_mm() doesn't bump mm_users. Do we care? I think the idea is that the kthread in question is expected to hold an mm_users reference. > > -- > Kirill A. Shutemov