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imf08.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=CSA4SIBb; spf=pass (imf08.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1775570431; a=rsa-sha256; cv=none; b=LaXZuBvnHBWzNzbVguyrKCFKWrBg0mup11w6ytaTQEY7K+banrTGFo5ABEXTne4uYucf1Q EMpzOg/TpSU1m6avqCJwTJF+JuJbhaxMJcggIUscLaKKLbDKC7XFpff0nm8qDao1njIxal Jlcp9zj1NIVmxH0xqRAYbKcTGb91WhY= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 982D560103; Tue, 7 Apr 2026 14:00:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5B4DFC116C6; Tue, 7 Apr 2026 14:00:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775570430; bh=ylwpwEG1Zp5ZmJr6ruzUlXPmhqsMVhkRkVSp7KXDk1c=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=CSA4SIBbZwcUH6Wvq28nMitrw6feeDhAG87iwCA0o240/79+cYbvNWxU0JZpEUnRj zHXDoEzBzHUhIuJOAFq/8jZ1UahrfJNsCQWIH2HzksUb/0FZrDqWxq45x9wJI6xMAE mRm1918vlQVhqopG/gWAHwoH8C8CXcj+uzpeEGFb4NhswoGHwT9cPbvBvGYPsal9h0 l3YZ658hIJCu6j1n8jay2QbR0vBAyWTYoMvhYs3ahv55X4A+dP0CERPVO/SJsHJq4f 90hJnbMNri3Jbeafb+97/wsJe0tm1kbZAYoyTM0iLaI1WYF6GBzgZ/x7rj4ajosGFE vMzLYTTe6RugQ== Message-ID: <0cbb6ee2-e4df-4161-9378-f2b63e849683@kernel.org> Date: Tue, 7 Apr 2026 16:00:24 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] docs: proc: document ProtectionKey in smaps To: Kevin Brodsky , linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Yury Khrustalev , Jonathan Corbet , Shuah Khan , Dave Hansen , Andrew Morton , Lorenzo Stoakes , Vlastimil Babka , Mark Rutland , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org References: <20260407125133.564182-1-kevin.brodsky@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20260407125133.564182-1-kevin.brodsky@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: A5970160015 X-Stat-Signature: wmut6t671cske6g8j8c5xpws36f5cckp X-Rspamd-Server: rspam06 X-HE-Tag: 1775570431-775084 X-HE-Meta: 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 9jZwZ6UC 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/7/26 14:51, Kevin Brodsky wrote: > The ProtectionKey entry was added in v4.9; back then it was > x86-specific, but it now lives in generic code and applies to all > architectures supporting pkeys (currently x86, power, arm64). > > Time to document it: add a paragraph to proc.rst about the > ProtectionKey entry. > > Reported-by: Yury Khrustalev > Signed-off-by: Kevin Brodsky > --- > Cc: Jonathan Corbet > Cc: Shuah Khan > Cc: Dave Hansen > Cc: Andrew Morton > Cc: Lorenzo Stoakes > Cc: Vlastimil Babka > Cc: David Hildenbrand > Cc: Mark Rutland > Cc: linux-fsdevel@vger.kernel.org > Cc: linux-mm@kvack.org > --- > Documentation/filesystems/proc.rst | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst > index b0c0d1b45b99..d673cad7dbe4 100644 > --- a/Documentation/filesystems/proc.rst > +++ b/Documentation/filesystems/proc.rst > @@ -549,6 +549,10 @@ does not take into account swapped out page of underlying shmem objects. > naturally aligned THP pages of any currently enabled size. 1 if true, 0 > otherwise. > > +If both the kernel and the system support protection keys (pkeys), > +"ProtectionKey" indicates the memory protection key associated with the > +virtual memory area. Reviewed-by: David Hildenbrand (Arm) -- Cheers, David