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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Kevin Brodsky , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: ;, Re: ;, [PATCH v5 3/3] kselftest: ;, mm: introducealloc_isolated_mem; Message-ID: References: <31418d0e-9745-4e8d-bc02-dbbd5cb9e193@kernel.org> <11a36d52-89a0-4f43-8a51-a4930e171ba0@kernel.org> <8d27168e-5443-4073-bc65-24ddbe32e29a@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8d27168e-5443-4073-bc65-24ddbe32e29a@kernel.org> X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 6A12D10000B X-Stat-Signature: aozjyyjxamj7erswgc5nzjuotwu5ashn X-HE-Tag: 1789048334-555695 X-HE-Meta: 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 IyBtzh8U THFZ0I3zAr7vF2L7IT6OmcPZ9DvEE/ern+u+0ccG1Ubo//ks1fvr1NJtXgmKqzGAxhQJdWc/xlbnVvIgeHJE8JM1DFrFsQRX9f5U48I+PNwNoJ63apEOZvcHEknksnVVH4RdjNiGGRi2Qt/k5IV8XkVk7xPgl23wvhV+2AJYw6J9gbL7SQ9lu43O34Bdif6mcTpgCCkrNp576qJXOA0rjsGl/njiR/MhaBxpd95Wly/jm9nV6FUkkbN8TLCuld0c5uj7DQ7wBCmyNqgP5CNfmpX8+E8qdXFX+wPU3 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Sep 10, 2026 at 03:14:36PM +0200, David Hildenbrand (Arm) wrote: > On 9/10/26 14:34, Yeoreum Yun wrote: > > On Thu, Sep 10, 2026 at 02:25:40PM +0200, David Hildenbrand (Arm) wrote: > >> On 9/10/26 14:16, Yeoreum Yun wrote: > >>> > >>> True. I overlooked guard bit is sticky. > >>> > >>> > >>> It's enough but alloc_isolated_mem() could be modified to allocate with > >>> PROT_NONE first and then change the prot. > >>> > >>> It seems whether make a helper or testcase should write the code > >>> properly in case of unwanted VMA merge. > >>> > >>> IMHO, instead of testcase write them all > >> > >> So far I am aware of exactly one test case, which others do absolutely need this? > > > > True. I'll respin with your suggestion. > > Don't get me wrong, if we'll need this for other tests we can add helpers. But > for a single user adding a helper is not really worth it. No worries. Since I thought there is no use case right now except the test, I've agreed. Thanks! -- Sincerely, Yeoreum Yun