From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A1853219303 for ; Tue, 2 Jun 2026 13:08:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780405685; cv=none; b=ptEsWa9L5lz9MShDa9CvvJ+lzAXixsGaKqxieWgD8pFaNYpAtY6GcTBrEzBAOH/CQ4NAryj+aigAIkqYF8jB6q5Nmo/T/IN/aFQ/tFgZCo+zPzAqT8FM4wBy1v2/hWAKpUhikuo+CH/1gbO6f0bL3NbjFK9dOmpbmSwnFrX+3Kc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780405685; c=relaxed/simple; bh=FAi/sCj2T+WtaKH9ze8tfiuObDhwsqvWy/FEm2pnzSE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=qn23c9HDzx3eWr9zDhUKxSU/0l+1iIQY4OTRvjMHQxPE1Pe241Cfg6K32RWkfssdR2LxFMBKS+GPQhv6VZLkhZ9bWM7vEon8sLhidbC9t1TxwTfGbxYq/oh4bufUsEc0gBiF13e8nH7HkfHljXhPZ/pO3ANiHEmL9CVfMP1no0g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YjD8qWvl; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YjD8qWvl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 305981F00893; Tue, 2 Jun 2026 13:08:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780405684; bh=7gdrxNrVLvwfZgr57YR0p9t9xmjz+xT3wRBbVrlHhXY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=YjD8qWvlk/+0QU52fW24gxJKnVOPSh0k2RXfhE48vNcIA9k++3mfDd64kSZho3Ey4 Um2JUR/Fbh6sLYZfpAI9ZoQ4aSGeN70ARBhB1/lmAEm+v0qANoXrtrWtMqiflrzbq8 vaPknQr5KMEkE9ZXQipUs5zJTRF0tSEoWRnAbPh2RYPpTy/AGEr1H4qAEeSYygZ/XP yMn2buf+ZEaztue+Aqx1ZA8DllKtJMcnlj7Gcb7XO5AH0C2BkGNFjgVb81nGXq63uU +HIawJK7SRk+DzXdwDYPT42SqeEeRFU3Zp9x2M8D0bc9uz0+Lh7DT7h5efHuV3kNbK ZrOGLEkXJe2Kg== Message-ID: <589d3c4b-77af-40a3-8506-5b00a5194aff@kernel.org> Date: Tue, 2 Jun 2026 15:08:00 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Process (was Re: [PATCH mm-hotfixes-unstable v18 00/14] khugepaged: add mTHP) collapse support Content-Language: en-US To: "David Hildenbrand (Arm)" , Lorenzo Stoakes Cc: Nico Pache , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, liam@infradead.org, mhocko@suse.com, rppt@kernel.org, vbabka@suse.cz, willy@infradead.org References: <20260522150009.121603-1-npache@redhat.com> <506fed6b-8954-40fa-8b5e-c8bd8c0d004b@kernel.org> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 6/2/26 14:58, David Hildenbrand (Arm) wrote: > On 6/2/26 14:47, Vlastimil Babka (SUSE) wrote: >> On 6/2/26 13:20, David Hildenbrand (Arm) wrote: >>> On 6/1/26 18:16, Lorenzo Stoakes wrote: >>>> >>>> Err what? The 'random' tree is the MAINTAINERS entry you are targeting, it's >>>> based on the mm-next stable branch and only diverges in the work that's been >>>> done specific to the subtree, what's crazy exactly? >>> >>> We'll still have plenty of patch sets that touch files cross trees. >>> >>> I don't see the problem of sending stuff against the integration tree from where >>> it can just be cleanly picked up by sub-maintainers (after all, that's where all >>> the subtrees were integrated against)? Or what exactly is the problem with that? >> >> The problem is that the patches would not be applied on top of the >> integration tree, so it doesn't make sense to base them on it in the first >> place. Unless they target the next cycle, where the integration tree would >> first become part of rc1, which would be the new base for all the >> submaintainer trees. > Why does that matter? Well, as longs as there are no conflicts, it probably doesn't. > For example, the slab-next tree gets merged into the mm-next tree. Submitter > will send against mm-next. > > The slab maintainer will cherry-pick the patches on top of slab-next. From where > they end up in mm-next. Note slab-next itself might be a collection of topic branches and it might be more flexible to create another topic branch (based on rc1) and merge it, than apply stuff on top of a product of merging. (I think extreme case if vfs where almost everything is topic branch and even the PRs to Linus are many separate branches?) > In the rare event of conflicts, the base-commit ID is there and known. If it's > too much of a mess, we could ask to resend against the slab-next tree. Alright, I guess some conflicts might be harder to resolve when based on mm-next and then tried to rebase on slab-next only. And others harder to resolve when based on rc1 and then integrated to slab-next. > Again, TIP allows that. For example, I never based any x86/mm patch on x86/mm > and ... was fine? :) >