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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772127272; bh=7ckD0akXKp5yLmXPxmzZt9zqQrhBl/9sTG74HrNfedw=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=lEz4PawUesO+34+SHQ759Xpjio4FLMXg7qsEvPAXt0ZKKZO4I2kQ4PaZLARMQwY70 JBoK73NyWHncOGYZ3P5a+JchaTsq+1o+F2nmWq5n/qkXET0OEvENaTorD+3bKRxj4J W2cCZ+JQ6QuDmIaBB7mjSZuybtAsvMYYfL6T3HKRnsFe3L4t97d+NhK22On8HhnKI2 xAZ9VnipVJ0oVMnjy5SoQpUwtB/d5YUqm5ZqCyzhCldmx6Tek7RbEu0WgT3nj7utjh xgyFFPgywESchdOad4i81oO7pQWx6DpteJKQ9Bdk3l6dMrQjApdOtHkTbWO9tKVzf/ K7EUEwl/iLaBw== Message-ID: Date: Thu, 26 Feb 2026 18:34:24 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] hv_balloon: Change default page reporting order To: Yuvraj Sakshith , akpm@linux-foundation.org, mst@redhat.com Cc: vbabka@suse.cz, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, linux-mm@kvack.org, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com, virtualization@lists.linux.dev, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260226070125.3732265-1-yuvraj.sakshith@oss.qualcomm.com> <20260226070125.3732265-3-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-Queue-Id: C6A112000D X-Stat-Signature: zwtpugrqcq81w65pyraumwwfnte7wq84 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1772127273-815626 X-HE-Meta: U2FsdGVkX19rKuMZATk++O5Nu96m1cO92wgbbcaKzkFC5mVaDe9JN8RC9g6+W/AoQPZvTPDieEBe4tuLMiyAoDZNnZ9NgTaD2S+5wUUi3Ozji3uOeCuB1pvWqzge/qFdGNrhaYGhm5E4b++rT0SzfKpyQILmnJ5PQe6hBWtzBI0x9UZlQ4IvovI1wQ8JLH+2ACgpXO3KhZBEYkAhcetJaFsLZLsrI6OP/iew4xeKhCpaR6IGFk6FGCRobMl7GudpkvLlKs/DUFvgJlKghJT6uyl2o5Gy1UFB6nL1pmOh3655yT7qPtOc0Y1VtDZg2v4/mKF8deCgiyEdkWG06EzG5mtB1GuIrMuFmJdVUOgAGn5LNNneAO3XKUTvDzAb7OsBYttYxpW/a82gvPEXjiXz+HylZi4XFNDY7nE2XE6FCSYQm0+v0EF9PpM2k6GeOYriSzMcdM9CWcqvCEtPzQLDpeTmZn6G5pTdZWVK5ciD5xPG8tOMprEADMZluvPmpk1wAJ21uQ9wt3fCkiyMlCNYPKIWXSKkn47ki8SrQBup5nIm2UZu3aF07VdfdwdsjryWceHQ+eT4saPkySHXe45lRuCXL6kfZjazANP0DwhmbaKj8jdLDC80YG41l7lMYcn5PCH2RATkvtjPgewnOLdxvzAY8sysQETeSiIlm1oa4lo904s88+NhePSpAbdrQ7o0yMgU3DeejwWd6/EEab2ufSzlBHwpw8iKRd+16th+3ORHuZ12DzWaH/4ALGHWQ2XRmdmt7xrdD9R8K1IaphUD5IabV9uEsPChmQkPxwgzg2XFmkcKVpg0EhMWZ6oA+mIIT8ujg48rsWKcPOXOnWuDHpEgeUYCoT2TuEkx2i8bDrKYbrY5MnuJufuKySXaoa7Yp5OXbINJ/0uyImQtEbYGUdvmnT3peRgFb5bPsaWSAfMegY1UjJrsD8k7unK9E8fT09p0Ez8yHENwlU8THmM NTJBm5so dy3THDLpoaWdNHCFZ2VQPSGuiN826ZiaBeGHD7gg7bEDIUlRmFimZIoooS52ag50lY95fO7mtyula34gruIXaXIe/sJ0IEuxSq92uZ50e1w6WWoxaGmVoX4Gl24iAgb00cSbR7du973ZbXjOHAaIw0qOkahMRad9UjlLz19vkCTs72zYwH+8/ue1AZWJMR57CDAmc23uDUxIXfZjdiv5D33aQxUmuTAoVjat5PYzp0YlBe3tBWsF4caTx7QCGJZe2QNmrnb1vL41LyXJ3jLk4CbWZUEmT2KkcDcB8uVU/uOzxhk7KZe7eCZ8Fsomjd9Kd1ChOzzYMlD9W+GG8PA8aVBvl6UXIlmICTfI3 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/26/26 08:01, Yuvraj Sakshith wrote: > page_reporting_order used to fall back to default > value (passed as parameter or MAX_PAGE_ORDER) if > the driver wishes to not provide it. > > The way the driver used to do this was by passing > the order as zero. > > Now that zero is a valid order that can be passed by > a driver to page reporting, we use -1 to signal > default value to be used. > > Signed-off-by: Yuvraj Sakshith > --- > drivers/hv/hv_balloon.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c > index 2b4080e51..e33d6e3b2 100644 > --- a/drivers/hv/hv_balloon.c > +++ b/drivers/hv/hv_balloon.c > @@ -1663,7 +1663,7 @@ static void enable_page_reporting(void) > * We let the page_reporting_order parameter decide the order > * in the page_reporting code > */ > - dm_device.pr_dev_info.order = 0; > + dm_device.pr_dev_info.order = -1; > ret = page_reporting_register(&dm_device.pr_dev_info); > if (ret < 0) { > dm_device.pr_dev_info.report = NULL; Logically, that patch must come before #1. And the patch description should be rephrased to clarify that we want to change that behavior. Reviewed-by: David Hildenbrand (Arm) -- Cheers, David