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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 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 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 7ACD11C0003 X-Stat-Signature: zxtcziezk4s7x137dps8fqqerf996rbp X-HE-Tag: 1787126010-178000 X-HE-Meta: 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 Sa32wdhf p3zC6rExMH8N2VsNf+HqEpbK4WhA5IORvHN9DbZv/hqt4O0cBCvK9dGU///LfxE+AJ53m0t7/Qye7AJhcj667z6x1QUW76GY9e0MFzxJ3xYaDrbDGgD6wa0JuxDgQgrYvHYfXD2kDJdohKC3miJpVxTSO4AtS9091wUkbSlESxHmhK4D2d5FphHSlJMrgpWeQ6D1sYUeee31RvduREKnnfRpwJsJX0JR06TpvPgayf6+KYQC8ukY/9d5BDCoezdqwbLVdIUPk6G7NhkD+W5xiGIrJnYmLRVtXqjB7mtsxdV1c8ydAotNfiWvcxd3KZY4/LbY0KQdXTcFSIKY= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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