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b=TBbcOWnSr19MwF0MKrCb2IoabYD0Nb+Hare+gEpTLzqusRx2+g7sBBoVWN7mXfVuZ 9g48PR844JLrnIVBXNJDcPRzZ9OqZquI7XiHNGeRwHRykZYpEycTOUpmGN0z4nW/2x exNm6rPf3N4LEfbJUmfd492tMzcaecLPdXqfDuC4XviG8bw0zrKfc340q+uV2v7A31 tSGddRTWmUAG4XhmWs/NugkfoosrV9ks7Kz30Zoom9Se8/nzViTi1v4hjixSRy25gU EU0bg8YbcDJPHiMekaav/bto5jUZ768ihhxepiBF9REEAyupmmRO5IMAzEtlO7J7ps 8hPuYpgjOVq+g== Message-ID: Date: Mon, 22 Dec 2025 11:54:46 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6] mm/hugetlb: ignore hugepage kernel args if hugepages are unsupported To: "David Hildenbrand (Red Hat)" , Sourabh Jain , "Ritesh Harjani (IBM)" , Andrew Morton Cc: Borislav Petkov , Heiko Carstens , Ingo Molnar , Madhavan Srinivasan , Michael Ellerman , Muchun Song , Oscar Salvador , Thomas Gleixner , Vasily Gorbik , linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, x86@kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org References: <20251221053611.441251-1-sourabhjain@linux.ibm.com> <87a4zcml36.ritesh.list@gmail.com> <655cc605-2ce1-4ccb-8cc0-a0a31a9c89fd@kernel.org> <87fr93ky5i.ritesh.list@gmail.com> <16fef7a5-6853-4a6f-8d27-e005fa351eb7@linux.ibm.com> <051628be-ed70-4a56-8704-f2b8cdea1984@kernel.org> Content-Language: fr-FR From: "Christophe Leroy (CS GROUP)" In-Reply-To: <051628be-ed70-4a56-8704-f2b8cdea1984@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Stat-Signature: bcdss1dyoq5gbmn6x46d35bciuohd97d X-Rspam-User: X-Rspamd-Queue-Id: 0D49B100007 X-HE-Tag: 1766400893-758892 X-HE-Meta: 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 B0pFbbSS 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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: Le 22/12/2025 à 11:28, David Hildenbrand (Red Hat) a écrit : > On 12/22/25 06:57, Sourabh Jain wrote: >> >> >> On 22/12/25 08:42, Ritesh Harjani (IBM) wrote: >>> "David Hildenbrand (Red Hat)" writes: >>> >>>>> Coming back to the fixes tag. I did mention a bit of a history [2] of >>>>> whatever I could find while reviewing this patch. I am not sure >>>>> whether >>>>> you have looked into the links shared in that email or not. Here [2]: >>>>> >>>>> [2]: https://eur01.safelinks.protection.outlook.com/? >>>>> url=https%3A%2F%2Flore.kernel.org%2Flinuxppc- >>>>> dev%2F875xa3ksz9.ritesh.list%40gmail.com%2F&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7Cfe40f4881e8441ab3ebf08de4144e747%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639019961377096292%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=Dnvzy5kJ%2ByF9GJjIw%2B12FTjaVgeAM2gA9g7hsYl7Qok%3D&reserved=0 >>>>> >>>>> Where I am coming from is.. The current patch is acutally a partial >>>>> revert of the patch mentioned in the fixes tag. That means if this >>>>> patch >>>>> gets applied to the older stable kernels, it would end up bringing the >>>>> same problem back, which the "Fixes" tagged patch is fixing in the 1st >>>>> place, isnt' it? See this discussion [3]... >>>>> >>>>> [3]: https://eur01.safelinks.protection.outlook.com/? >>>>> url=https%3A%2F%2Flore.kernel.org%2Fall%2Fb1f04f9f-fa46- >>>>> c2a0-7693-4a0679d2a1ee%40oracle.com%2FT%2F%23m0eee87b458d93559426b8b0e78dc6ebcd26ad3ae&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7Cfe40f4881e8441ab3ebf08de4144e747%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639019961377117150%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=bOO7FGN4jAtX3jjBnJVpSurmM9rGmz8vIs1iGtbm1gU%3D&reserved=0 >>>>> >>>>> ... So, IMO - the right fixes tag, if we have to add, it should be the >>>>> patch which moved the hpage_shift initialization to happen early >>>>> i.e. in >>>>> mmu_early_init_devtree. That would be this patch [4]: >>>>> >>>>> [4]: https://eur01.safelinks.protection.outlook.com/? >>>>> url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git%2Fcommit%2F%3Fid%3D2354ad252b66695be02f4acd18e37bf6264f0464&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7Cfe40f4881e8441ab3ebf08de4144e747%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639019961377133860%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=0yTuECy%2BBGDLiSNYuqYH9xGBOSxiRLxAtW%2FWTQU%2FB%2BA%3D&reserved=0 >>>>> >>>>> Now, it's not really that the patch [4] had any issue as such. But it >>>>> seems like, that the current fix can only be applied after patch >>>>> [4] is >>>>> taken. >>>>> >>>>> Do we agree? >>>> I think we should document all that in the cover letter, an describe >>>> that this partial revert is only possible after [4], >>> Yes, I agree. Let's add the above details in the commit msg. >>> >>>> and that that must >>>> be considered when attempting any kind of stable backports. >>> Sure. I would prefer if we change the Fixes tag to the one which I >>> pointed in above [4] (with explaination in the commit msg). However I am >>> still ok if we would like to retain the existing fixes tag and show [4] >>> as a dependency. >> >> I think we should keep the current Fixes tag with an explanation for >> dependency >> on [1] in the commit message. >> >> Would anyone have a different view? > > Whatever introduced the issue should be called out in the Fixes tag; if > there are dependencies for the fix through other patches that were > already merged, that can be documented in the patch description > (relevant for stable or distro backports only). > We can also use the Depends-on: tag, see for exemple commit 9517b82d8d42 ("nbd: defer config put in recv_work"): Reported-by: syzbot+56fbf4c7ddf65e95c7cc@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/6907edce.a70a0220.37351b.0014.GAE@google.com/T/ Fixes: 87aac3a80af5 ("nbd: make the config put is called before the notifying the waiter") Depends-on: e2daec488c57 ("nbd: Fix hungtask when nbd_config_put") Signed-off-by: Zheng Qixing 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C6255C4CEF1; Mon, 22 Dec 2025 10:54:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766400892; bh=cv/VTMXLxul+HjudSJW7wkMxfJdfBr+el6AQMlItv9w=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=TBbcOWnSr19MwF0MKrCb2IoabYD0Nb+Hare+gEpTLzqusRx2+g7sBBoVWN7mXfVuZ 9g48PR844JLrnIVBXNJDcPRzZ9OqZquI7XiHNGeRwHRykZYpEycTOUpmGN0z4nW/2x exNm6rPf3N4LEfbJUmfd492tMzcaecLPdXqfDuC4XviG8bw0zrKfc340q+uV2v7A31 tSGddRTWmUAG4XhmWs/NugkfoosrV9ks7Kz30Zoom9Se8/nzViTi1v4hjixSRy25gU EU0bg8YbcDJPHiMekaav/bto5jUZ768ihhxepiBF9REEAyupmmRO5IMAzEtlO7J7ps 8hPuYpgjOVq+g== Message-ID: Date: Mon, 22 Dec 2025 11:54:46 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6] mm/hugetlb: ignore hugepage kernel args if hugepages are unsupported To: "David Hildenbrand (Red Hat)" , Sourabh Jain , "Ritesh Harjani (IBM)" , Andrew Morton Cc: Borislav Petkov , Heiko Carstens , Ingo Molnar , Madhavan Srinivasan , Michael Ellerman , Muchun Song , Oscar Salvador , Thomas Gleixner , Vasily Gorbik , linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, x86@kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org References: <20251221053611.441251-1-sourabhjain@linux.ibm.com> <87a4zcml36.ritesh.list@gmail.com> <655cc605-2ce1-4ccb-8cc0-a0a31a9c89fd@kernel.org> <87fr93ky5i.ritesh.list@gmail.com> <16fef7a5-6853-4a6f-8d27-e005fa351eb7@linux.ibm.com> <051628be-ed70-4a56-8704-f2b8cdea1984@kernel.org> Content-Language: fr-FR From: "Christophe Leroy (CS GROUP)" In-Reply-To: <051628be-ed70-4a56-8704-f2b8cdea1984@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251222_025454_844439_A1C754FE X-CRM114-Status: GOOD ( 20.50 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org CgpMZSAyMi8xMi8yMDI1IMOgIDExOjI4LCBEYXZpZCBIaWxkZW5icmFuZCAoUmVkIEhhdCkgYSDD qWNyaXTCoDoKPiBPbiAxMi8yMi8yNSAwNjo1NywgU291cmFiaCBKYWluIHdyb3RlOgo+Pgo+Pgo+ PiBPbiAyMi8xMi8yNSAwODo0MiwgUml0ZXNoIEhhcmphbmkgKElCTSkgd3JvdGU6Cj4+PiAiRGF2 aWQgSGlsZGVuYnJhbmQgKFJlZCBIYXQpIiA8ZGF2aWRAa2VybmVsLm9yZz4gd3JpdGVzOgo+Pj4K Pj4+Pj4gQ29taW5nIGJhY2sgdG8gdGhlIGZpeGVzIHRhZy4gSSBkaWQgbWVudGlvbiBhIGJpdCBv ZiBhIGhpc3RvcnkgWzJdIG9mCj4+Pj4+IHdoYXRldmVyIEkgY291bGQgZmluZCB3aGlsZSByZXZp ZXdpbmcgdGhpcyBwYXRjaC4gSSBhbSBub3Qgc3VyZSAKPj4+Pj4gd2hldGhlcgo+Pj4+PiB5b3Ug aGF2ZSBsb29rZWQgaW50byB0aGUgbGlua3Mgc2hhcmVkIGluIHRoYXQgZW1haWwgb3Igbm90LiBI ZXJlIFsyXToKPj4+Pj4KPj4+Pj4gWzJdOiBodHRwczovL2V1cjAxLnNhZmVsaW5rcy5wcm90ZWN0 aW9uLm91dGxvb2suY29tLz8gCj4+Pj4+IHVybD1odHRwcyUzQSUyRiUyRmxvcmUua2VybmVsLm9y ZyUyRmxpbnV4cHBjLSAKPj4+Pj4gZGV2JTJGODc1eGEza3N6OS5yaXRlc2gubGlzdCU0MGdtYWls 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