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 EEB723E6394 for ; Wed, 19 Aug 2026 07:53:28 +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=1787126009; cv=none; b=T3p3MDgLflcC/37o7FmdFbJF0W/SGnT9tcbZLGPN+S6tsUTpTM1xv2IFq/gYG/UX6BlsE1zcmE+27Bt9ZTRMn7nIgk9w2WQgHLSY5oK3yTHmqZJMEcayBCyUdlr/8vM9pl/nhPi+tHXY7okb4rVKD9FKLorE3y1iNjL+4m/VN9U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787126009; c=relaxed/simple; bh=hu9d8hdNkJ6I9v2RO+MU7FbZAJ15BK89nH53StFUbAE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=sDGCXcCfXfs/dbOie+dIHP9AmYBADT0M5e1QtVNQkv5Zagqp2UU/L2EE5R6D1okI9/LxfQuCG1Q3/0aFJUnYGCsdzBE5AkSlG11lZY1YbeWC0Y5zfEkl/Jm+URgLMt7IpSxoQrgXUEqmRU3tFBOFJzbph3a2DIikGxIJly7B3T0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eWcQU0Tf; 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="eWcQU0Tf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 315F51F00A3A; Wed, 19 Aug 2026 07:53:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787126008; bh=IOVnAzrtzMZry52kAtJbyAWqgqvrP9lIJJ3RCLrpCZo=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=eWcQU0TfxIXjvxi/EgDAtwrxXGiGGUEUm0JmfaavjmD/GlHAnV/Va6QAXcquMuJ09 RV7Iu/9IJuFonJiSo0szpDVf5YP6uoQJD+TTD6DXRwwPQTGNbBWYaYv0hPDGbAfi2I gKBKKoVi/Hxscz4recgIOokI7wSxcDAd0AWRhv1WaEeXCEAGhYaYzIZevc1v+POmiy nwL5PB/+MtENHwYdx3Lkqfc4VK2Ar/kJgKCyItZNsioxwmBD+dNpKCQgvD/2dt3Xqf j/MPZI/mX/wVHNudeSFg6FTbsi3heYKqz4GMPTClpTm4oGQxn3kfulatHh8feGOPL0 UIt7M05rfTn8A== Message-ID: <35cca76a-4d3a-451a-b492-dd4423ac3e63@kernel.org> Date: Wed, 19 Aug 2026 09:53:25 +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: [PATCH] hugetlb: add cond_resched() to __unmap_hugepage_range() To: Andrew Morton Cc: Leon Hwang , linux-mm@kvack.org, Muchun Song , Oscar Salvador , linux-kernel@vger.kernel.org, Lance Yang References: <20260818135029.93288-1-leon.hwang@linux.dev> <3dadebb3-7e2a-459c-a5e8-b375faf89938@kernel.org> <20260818111756.6b0e347db3170bc22cc3c5af@linux-foundation.org> <2a523945-825c-45a5-a680-37e941e092d3@kernel.org> <20260818115526.654d7311366b66cd031c67e4@linux-foundation.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/18/26 20:55, Andrew Morton wrote: > On Tue, 18 Aug 2026 20:21:37 +0200 "David Hildenbrand (Arm)" wrote: > >>> >>> That's pretty bad behavior and we might want to fix it in earlier >>> kernels. Is PREEMPT_NONE effectively dead in 6.18.x and its >>> existing users? >>> >>> If yes, we do want to fix older kernels then we should merge this. >>> >> >> Okay, but that would be stable-only fixes? > > Not understanding. > > Maybe you refer to adding a patch to -stable but not to -linus? That's > against the -stable rules > (Documentation/process/stable-kernel-rules.rst). It's tricky: if a problem only exists in stable (there is nothing to fix in Linus' tree), then a stable-only fix is acceptable. Otherwise we'd have to route unnecessary churn through upstream just for it to reach stable, which doesn't make any sense. When sending a stable patch, it should document how this is only a stable problem and why no corresponding upstream fix is required (or how the actual fix for upstream is actually deprecating the relevant config). -- Cheers, David