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(p200300d82f4e3200c99da38b3f3ad4b3.dip0.t-ipconnect.de. [2003:d8:2f4e:3200:c99d:a38b:3f3a:d4b3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-475c4342373sm135497185e9.12.2025.10.23.13.08.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 23 Oct 2025 13:08:45 -0700 (PDT) Message-ID: <28f2ebe9-cfed-41c3-803f-8756dca0e300@redhat.com> Date: Thu, 23 Oct 2025 22:08:43 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 12/13] mm: bail out of lazy_mmu_mode_* in interrupt context To: Kevin Brodsky , linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Alexander Gordeev , Andreas Larsson , Andrew Morton , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , "David S. Miller" , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org References: <20251015082727.2395128-1-kevin.brodsky@arm.com> <20251015082727.2395128-13-kevin.brodsky@arm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+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: <20251015082727.2395128-13-kevin.brodsky@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: U9z_Eo0M-OnIOU6QOxEFnF1eHHqRFZS0PqUdPCE6Tas_1761250127 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Stat-Signature: hf19m6g7qy4fuy3qrmkyf9ztuibq1xw9 X-Rspam-User: X-Rspamd-Queue-Id: A954F40018 X-HE-Tag: 1761250129-161692 X-HE-Meta: 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 CdLwBr4r 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 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 15.10.25 10:27, Kevin Brodsky wrote: > The lazy MMU mode cannot be used in interrupt context. This is > documented in , but isn't consistently handled > across architectures. > > arm64 ensures that calls to lazy_mmu_mode_* have no effect in > interrupt context, because such calls do occur in certain > configurations - see commit b81c688426a9 ("arm64/mm: Disable barrier > batching in interrupt contexts"). Other architectures do not check > this situation, most likely because it hasn't occurred so far. > > Both arm64 and x86/Xen also ensure that any lazy MMU optimisation is > disabled while in interrupt mode (see queue_pte_barriers() and > xen_get_lazy_mode() respectively). > > Let's handle this in the new generic lazy_mmu layer, in the same > fashion as arm64: bail out of lazy_mmu_mode_* if in_interrupt(), and > have in_lazy_mmu_mode() return false to disable any optimisation. > Also remove the arm64 handling that is now redundant; x86/Xen has > its own internal tracking so it is left unchanged. > > Signed-off-by: Kevin Brodsky > --- > arch/arm64/include/asm/pgtable.h | 17 +---------------- > include/linux/pgtable.h | 16 ++++++++++++++-- > include/linux/sched.h | 3 +++ > 3 files changed, 18 insertions(+), 18 deletions(-) > > diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h > index 944e512767db..a37f417c30be 100644 > --- a/arch/arm64/include/asm/pgtable.h > +++ b/arch/arm64/include/asm/pgtable.h > @@ -62,37 +62,22 @@ static inline void emit_pte_barriers(void) > > static inline void queue_pte_barriers(void) > { > - if (in_interrupt()) { > - emit_pte_barriers(); > - return; > - } > - That took me a while. I guess this works because in_lazy_mmu_mode() == 0 in interrupt context, so we keep calling emit_pte_barriers? -- Cheers David / dhildenb