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b=VIC026HRBah3/LsXLaAE3th9gYPyUI7/UJ+HecNvUect9qSGHiQUG+MPv+IJV7zNf 9gdYifVQKJVPagLEqwd7OXb5JZBYyuFjakGvlHbX8fi/uIcHPYCQxk4oc2W97goHeG +Gay3ZH8tcIuXzGTIt51ZglUY2UPYKRU/fSXEUofKwu36OAgr6NuQ2EqlBzkPfGorn gmv7QFaki6yYwOxL6U7x5GawqWLqNANBUX1/uux1igWZwjohPmBxMedZ0RmidJXedK A1+Tg++rJ4Oxt+hSlMfq/RPmElqRzrLHi0khAyQ6m3DGxSob9Sp6uCt9xSdS3/7EG9 GvTpxHuW80Jhw== Message-ID: <1a6aedcd-34c2-4e26-b07e-6eb8d423b759@kernel.org> Date: Wed, 7 Jan 2026 17:53:50 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/4] iommu: Add page_ext for IOMMU_DEBUG_PAGEALLOC To: Mostafa Saleh , linux-mm@kvack.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: corbet@lwn.net, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, akpm@linux-foundation.org, vbabka@suse.cz, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, xiaqinxin@huawei.com, baolu.lu@linux.intel.com, rdunlap@infradead.org References: <20260106162200.2223655-1-smostafa@google.com> <20260106162200.2223655-2-smostafa@google.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Stat-Signature: wz3yotjbnk5g1htj5iydezdkuxdc7dsp X-Rspam-User: X-Rspamd-Queue-Id: C8D43C001A X-HE-Tag: 1767804840-393313 X-HE-Meta: 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 Q/fppVJZ CDFd3rupXMub6j2NkkvgsMhL1NTQU/R/fyN7O6N7HRYjr1nlOwkMExiEZS+PffJ5MY3O4PnGN/0A8q3J2z5JanlBzWvkI+9GbV5mRVa4oI/8dqnsMv0mj9qc+bFTxmdb49xEM3CHxTucZW/a0JjrnuB2+k7ymOiDwlmlEOREaQZwuq2CgFor+QDM6RUPf8epUqDq02nL17QtQJ+YTdWa66sE8ySUE017IhYo4pM0GKjDsoF7295yYUXaPUIiIqjMSLyrWOu/rIU83EfGMDnMTV91rV7EkzD7oEhkK20uxZp7KIl60Q13DcLa4v4YXM5ClQ6Z+ycSNase24C8KZVySXHE5f5IxtcPWy8IPKgXNtw6QRsXbGmtqMRftvGsjO/LSNh1o 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: List-Subscribe: List-Unsubscribe: On 1/6/26 17:21, Mostafa Saleh wrote: > Add a new config IOMMU_DEBUG_PAGEALLOC, which registers new data to > page_ext. > > This config will be used by the IOMMU API to track pages mapped in > the IOMMU to catch drivers trying to free kernel memory that they > still map in their domains, causing all types of memory corruption. > > This behaviour is disabled by default and can be enabled using > kernel cmdline iommu.debug_pagealloc. > > Reviewed-by: Lu Baolu > Signed-off-by: Mostafa Saleh > --- I think I acked it, but maybe too late for you to spot it for the MM bits Acked-by: David Hildenbrand (Red Hat) -- Cheers David