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Mon, 15 Jun 2026 17:37:32 -0700 (PDT) From: Askar Safin To: agordeev@linux.ibm.com Cc: akpm@linux-foundation.org, axboe@kernel.dk, brauner@kernel.org, david@kernel.org, dhowells@redhat.com, hch@infradead.org, jack@suse.cz, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-next@vger.kernel.org, linux-s390@vger.kernel.org, miklos@szeredi.hu, netdev@vger.kernel.org, patches@lists.linux.dev, pfalcato@suse.de, safinaskar@gmail.com, torvalds@linux-foundation.org, viro@zeniv.linux.org.uk, willy@infradead.org Subject: Re: [PATCH 2/3] vmsplice: make vmsplice a trivial wrapper for preadv2/pwritev2 Date: Tue, 16 Jun 2026 03:36:59 +0300 Message-ID: <20260616003659.4002764-1-safinaskar@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260608171917.3195488Afc-agordeev@linux.ibm.com> References: <20260608171917.3195488Afc-agordeev@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Alexander Gordeev : > Hi All, > > This patch as commit e2c0b2368081b ("vmsplice: make vmsplice a trivial > wrapper for preadv2/pwritev2") in linux-next on s390 causes the selftest > tools/testing/selftests/mm/cow.c to hang: > > # [RUN] vmsplice() + unmap in child ... with PTE-mapped THP (128 kB) > > Recently there has been changes in THP area, so the problem is not > necessary linked to this patch per se. > > Please, let me know if you need any additional information. > > Thanks! As well as I understand, this test uses vmsplice to pin pages. I. e. if my patch lands, then this test should be rewriten to use some other mechanism. -- Askar Safin