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Mon, 07 Jul 2025 12:09:05 -0700 (PDT) MIME-Version: 1.0 References: <033bf00f1fcf808245ae150346019aa7b997ea11.1751862634.git.alx@kernel.org> In-Reply-To: From: Marco Elver Date: Mon, 7 Jul 2025 21:08:29 +0200 X-Gm-Features: Ac12FXzEXTnw7qQ8nVMOKnW9TwW3dvF1frJO3Pa1PT5XcHth3lVbJtQONABfUf0 Message-ID: Subject: Re: [RFC v3 3/7] mm: Use seprintf() instead of less ergonomic APIs To: Alejandro Colomar Cc: linux-mm@kvack.org, linux-hardening@vger.kernel.org, Kees Cook , Christopher Bazley , shadow <~hallyn/shadow@lists.sr.ht>, linux-kernel@vger.kernel.org, Andrew Morton , kasan-dev@googlegroups.com, Dmitry Vyukov , Alexander Potapenko , Christoph Lameter , David Rientjes , Vlastimil Babka , Roman Gushchin , Harry Yoo , Andrew Clayton , Sven Schnelle , Heiko Carstens , Tvrtko Ursulin , "Huang, Ying" , Lee Schermerhorn , Linus Torvalds , Christophe JAILLET , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Chao Yu Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 0242C1C0011 X-Stat-Signature: 34oyycix85gf8a6yh4usko9modfkbyse X-Rspam-User: X-HE-Tag: 1751915347-137247 X-HE-Meta: U2FsdGVkX1+OcE02rKbeg8Ldd6Qi9yY7LygE4YHSsD1Z+iWF8oeezSPCPZk/SxUahv5g7r0U3ZETnNxJ/MiOEY3ejy5hqVwu9FsbNXObGmnoEZXaR3B088J8l5dMyEmvnJXz7lje3hEojQyhwO7TFZOvp6FSR/gCJdvCg5BYuJMpbekkXFyknzWao3WElDSD/259GpQIN1MNsWKS1lk9/MPgd23y32ejHmF7xNfmrMxH4fQaYyxi9DdyUwa741REuUPlUIvWnZP4z9TeHF2Nl5TIudKJzm1mlz3ZUmQm6OneY5EzRcJqJoMN5WHYCoPmtiLaw59//UwSmJ5GqGJ0m3iaUpw2+ei5FXqxJihFR7Z7hH15lscXBYJh4ERie/xnmfIuNafTDEo+svsX9R4r9frt1OLuXs/4YOnfLhpb2PAuOhTYPUHPiRjeT3NJ5ZmzcHFltTtjQ+FiwQDjqAUiTGSJq3zueJAfsajKfjUItSFU5rO2DgV9vOmj9Td4ULEJqbNt57KCvkas6wUcqNgcOHF18tKgraTlf0bqUNphGXU8OhnkjNJhikxBZMLIvAxSJAUR/wTh1V9+hnXrRoK+MhMYqxYq2z1LmapL9jP4/s1hVNwLkFXx0N81LtYiF+qkWn/bQ+4sUsl3MMajPcbPTrPm12CTS4OY+fUvqZVAd5/bd5ax7/x3Jd0FKhUYw9EEZOeek5gYMbyRsN2uvpT6hfQNuwwLhviSRQOXkJpxvzNuBaPiAfp7U5M6X8y31MGMV4TKwFjRmFq5zmY0X6S0YbSe406C9a9ErPFpSpu66W/rlBAtQR+8PzSLs5JjGfiX5AfO48tiX8FUpIfvBsLUedEkkbgAnwWCYQ5sAkCdwnPFcwrhecNmhPxyUXVwyhJFiq4u1HeKykHU+YP+v1bYRgVp498rFTTj/LziHkde2U6G54OHEupbsFNHVacmw99r39Jd99/32aBQWJWaC2r wUOtnF9j 30ckY/qs3EVomMR/r2+QI02Ev3wI9qLhykfHumIIGPsWdSw8s9RtfhGj6FsY8fxhyMMTlFnwYmjNWC5AQYNC0/dgcqFwi/PyB1IS3iZzDCEhztNpjcG7IIMHcOfo4tJjRpa34Dr6QsddtbDS80Z/7a1PJ1dtsGkmuwB9ePoJVh8HJAYt+dKVcOCW48Lcbz4SwcHvb9VdKV27MLRHkH7ppWnACA/QmtQKgKnt1soqPmiy+3dIFowFzjsn15znc9QCtp28a3Et6TJZfyUHk/1218RV2bFxOwDrAGgdijSBlMv3VMD2KHWArNYw0AKaFe0tGtp3MjvDmSEtE9jpUuHYXNUKHZIWa6XPP+SAu 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 Mon, 7 Jul 2025 at 20:51, Alejandro Colomar wrote: > > Hi Marco, > > On Mon, Jul 07, 2025 at 04:58:53PM +0200, Marco Elver wrote: > > Feel free to make it warning-free, I guess that's useful. > > Thanks! > > > > > Did you run the tests? Do they pass? > > > > > > I don't know how to run them. I've only built the kernel. If you point > > > me to instructions on how to run them, I'll do so. Thanks! > > > > Should just be CONFIG_KFENCE_KUNIT_TEST=y -- then boot kernel and > > check that the test reports "ok". > > Hmmm, I can't see the results. Did I miss anything? > > alx@debian:~$ uname -a > Linux debian 6.15.0-seprintf-mm+ #5 SMP PREEMPT_DYNAMIC Mon Jul 7 19:16:40 CEST 2025 x86_64 GNU/Linux > alx@debian:~$ cat /boot/config-6.15.0-seprintf-mm+ | grep KFENCE > CONFIG_HAVE_ARCH_KFENCE=y > CONFIG_KFENCE=y > CONFIG_KFENCE_SAMPLE_INTERVAL=0 ^^ This means KFENCE is off. Not sure why it's 0 (distro default config?), but if you switch it to something like: CONFIG_KFENCE_SAMPLE_INTERVAL=10 The test should run. Alternatively set 'kfence.sample_interval=10' as boot param. > CONFIG_KFENCE_NUM_OBJECTS=255 > # CONFIG_KFENCE_DEFERRABLE is not set > # CONFIG_KFENCE_STATIC_KEYS is not set > CONFIG_KFENCE_STRESS_TEST_FAULTS=0 > CONFIG_KFENCE_KUNIT_TEST=y > alx@debian:~$ sudo dmesg | grep -i kfence > alx@debian:~$ > > I see a lot of new stuff in dmesg, but nothing with 'kfence' in it. > > > Cheers, > Alex > > -- >