From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0411A390218; Tue, 3 Mar 2026 10:04:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772532261; cv=none; b=VTLRD4uVTTfD0C6rG5Z/87N83YfLjMwd8FuA4hyC5buW/xKX8ENYIYfN6zj6k7UIn3OPRdAHuRK3O4gzEr2mnkFPsA2OXZQsTnopzeJc3Wt4YeHtN5gSvc2baMM16vzhaqW0HsDEp3mff7u100kL2IpuJZJQWNIZ7nQvBbuIIsw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772532261; c=relaxed/simple; bh=LybxXzhrFhgaGAXY4fuW1jh4p0ek/7wtaX3PsXxtmhM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=LZE+mzmGZVhl74i8zH3fnIoekSOeTEVZFOewdjz3/X1P7RHj3kLUiCc3PeyzCOyP3VJ3BD3jJ3my8WUqWcRPmsfalWETw446yRPY/TFGd60KE4G9RctD0eWallyhRS7NpgFIhPGopvIp9aCcpaiCypUCfmnW39y3ves/uiCQ2LA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DXbN4s/A; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="DXbN4s/A" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 48089C2BCB2; Tue, 3 Mar 2026 10:04:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772532260; bh=LybxXzhrFhgaGAXY4fuW1jh4p0ek/7wtaX3PsXxtmhM=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=DXbN4s/A/bmKVh59PKyRzmKRa4GL5DqbyVMCByOsv5ya+SBVMcVBFf7iJYdu/rqTR WHZlwIbsdc1LEQ8ajTd0xOZdLIWyAkcvSoQk2M3Jb8TQQi0Y46LTv6oxHhNnoX5k5k jCTSX0GcBNVA2/6V8yLYN8vlczzHbm5vN3k3fYnh9mMHi2oIw1Hz5DFl+u0dXPxXkw fKVitj6D6sK+1XIrrKNbYqyy6qLfpmfjJggcziQM6O4fw5+cHPGDBV7qySv7wDL8UX jV/FOGsHzt+q+hoGubqdK/3m7iXm78GHbBvGIZ4zx5nBOzOp80I/vInVVyBDrbnPPA HXrkAGxyTbfIw== Message-ID: <1c6a148b-ca52-497c-9b7e-07a0aed186b3@kernel.org> Date: Tue, 3 Mar 2026 11:04:13 +0100 Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 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: <20260303093341.2927482-1-yuvraj.sakshith@oss.qualcomm.com> <20260303093341.2927482-2-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 On 3/3/26 10:33, 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 | 5 +++-- > 2 files changed, 4 insertions(+), 2 deletions(-) > > 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..40a756b60 100644 > --- a/mm/page_reporting.c > +++ b/mm/page_reporting.c > @@ -369,8 +369,9 @@ int page_reporting_register(struct page_reporting_dev_info *prdev) > * pageblock_order. > */ > > - if (page_reporting_order == -1) { > - if (prdev->order > 0 && prdev->order <= MAX_PAGE_ORDER) > + if (page_reporting_order == PAGE_REPORTING_ORDER_UNSPECIFIED) { This change must also go to #5. > + if (prdev->order != PAGE_REPORTING_ORDER_UNSPECIFIED && > + prdev->order <= MAX_PAGE_ORDER) > page_reporting_order = prdev->order; > else > page_reporting_order = pageblock_order; -- Cheers, David