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Mon, 17 Jan 2022 08:00:01 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7BB454C059; Mon, 17 Jan 2022 08:00:01 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 49BD24C04A; Mon, 17 Jan 2022 07:59:57 +0000 (GMT) Received: from [9.163.1.44] (unknown [9.163.1.44]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 17 Jan 2022 07:59:56 +0000 (GMT) Message-ID: <53a7254d-a2fa-928a-df78-d773a53bbf4b@linux.ibm.com> Date: Mon, 17 Jan 2022 13:29:55 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.4.0 Subject: Re: [PATCH v2 1/2] mm/cma: provide option to opt out from exposing pages on activation failure Content-Language: en-US To: David Hildenbrand , akpm@linux-foundation.org, linux-mm@kvack.org, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org Cc: mike.kravetz@oracle.com, mahesh@linux.ibm.com, sourabhjain@linux.ibm.com, osalvador@suse.de References: <20220112193340.149020-1-hbathini@linux.ibm.com> <20220112193340.149020-2-hbathini@linux.ibm.com> From: Hari Bathini In-Reply-To: Content-Type: text/plain; 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dmarc=pass (policy=none) header.from=ibm.com X-HE-Tag: 1642406411-747558 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 13/01/22 2:00 pm, David Hildenbrand wrote: >> +{ >> + if (!cma) >> + return; > > Do we really need that check for NULL? Probably not. > >> + >> + cma->reserve_pages_on_error = true; >> +} >> + >> /** >> * cma_init_reserved_mem() - create custom contiguous area from reserved memory >> * @base: Base address of the reserved area >> @@ -204,6 +214,7 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, >> cma->base_pfn = PFN_DOWN(base); >> cma->count = size >> PAGE_SHIFT; >> cma->order_per_bit = order_per_bit; >> + cma->reserve_pages_on_error = false; > > I think you can drop that; should already be initialized to 0. > > > Apart from that > > Reviewed-by: David Hildenbrand > Thanks for the review, David. Posted v3 with the changes suggested above. - Hari