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b=aj8aPiYmKukdRQi6O7Ps1KrQTuP9LNpCm0E+O1TzYfd/9YDeJBJH3G7GRSQVG5ewX vkRKhZgyakeaiEN9r/eN78cI/Souq4jGJ+Ui7URFynaSn4ycqasn4AxKMc4t1m8/cd kuNXW6vyuvyGwTVORsjgBDjHIE4A/+FxPKeliCuyGyjcWpXzJjUu8sK8obBw0Pod85 wOyDHBrMnRgzHCGSI3vaJqSFEBHDv9NxjdXDx5LA7YHiuZZPaKRr7MpHGWX3vR/9x9 fl7jkcGygkreaZlZo81cr7GCVlwZt33I7heip/fTmjlvqgk7pp1rIb6PuK0SA/MUzE EpRu1xyur2sEQ== Message-ID: Date: Tue, 3 Mar 2026 15:57:14 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/5] mm/page_reporting: add PAGE_REPORTING_ORDER_UNSPECIFIED To: Yuvraj Sakshith , mst@redhat.com Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com, akpm@linux-foundation.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-mm@kvack.org References: <20260303113032.3008371-1-yuvraj.sakshith@oss.qualcomm.com> <20260303113032.3008371-2-yuvraj.sakshith@oss.qualcomm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 4D4CE40015 X-Stat-Signature: 3rgcgo1nprq3ucn85e64agzsbsc5ekg4 X-Rspam-User: X-HE-Tag: 1772549844-841693 X-HE-Meta: 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 37JMQgZV s2rnM2bzG/aqyBI8ez6OGdQRv5F0gi6TIr18dL4X3K/t60NweUnSWv4SRFzJwQr8nlWHih0wPqIEUylIFkdBf4kmBfZFXzYQRJhVGQLBqViRcrsqn8jPttZU/kwb9xxXIRuTFbRV3VS0BXGIr9wDQgI8JHmKR7VoXqh5jhN8/or4JfydKXxAQhFpIi8sqFtmhyzqXI34Lfnwv2ekmPCJP0xUT146xXMxp16dci0EJ8M+Z09zVeEkruJiHYXm2uaOWKISr4bHkLkdK14+F3qlkvGBPBxYyksH1rJ0ol+SikZO7pJlyaejGCoMWBD4/HGT3JSuQ0wj7xtGF4LK+LJcfyvtEBrJ7pYk3czUN Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/3/26 12:30, Yuvraj Sakshith wrote: > Drivers can pass order of pages to be reported while > registering itself. Today, this is a magic number, 0. > > Label this with PAGE_REPORTING_ORDER_UNSPECIFIED and > check for it when the driver is being registered. > > This macro will be used in relevant drivers next. > > Signed-off-by: Yuvraj Sakshith > --- > include/linux/page_reporting.h | 1 + > mm/page_reporting.c | 3 ++- > 2 files changed, 3 insertions(+), 1 deletion(-) > > diff --git a/include/linux/page_reporting.h b/include/linux/page_reporting.h > index fe648dfa3..d1886c657 100644 > --- a/include/linux/page_reporting.h > +++ b/include/linux/page_reporting.h > @@ -7,6 +7,7 @@ > > /* This value should always be a power of 2, see page_reporting_cycle() */ > #define PAGE_REPORTING_CAPACITY 32 > +#define PAGE_REPORTING_ORDER_UNSPECIFIED 0 > > struct page_reporting_dev_info { > /* function that alters pages to make them "reported" */ > diff --git a/mm/page_reporting.c b/mm/page_reporting.c > index e4c428e61..a97ee07cb 100644 > --- a/mm/page_reporting.c > +++ b/mm/page_reporting.c > @@ -370,7 +370,8 @@ int page_reporting_register(struct page_reporting_dev_info *prdev) > */ > > if (page_reporting_order == -1) { > - if (prdev->order > 0 && prdev->order <= MAX_PAGE_ORDER) > + if (prdev->order != PAGE_REPORTING_ORDER_UNSPECIFIED && > + prdev->order <= MAX_PAGE_ORDER) Nit: if (prdev->order != PAGE_REPORTING_ORDER_UNSPECIFIED && prdev->order <= MAX_PAGE_ORDER) ^ aligned here Acked-by: David Hildenbrand (Arm) -- Cheers, David