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X-CSE-ConnectionGUID: rVCnJJTXRPKu/gTi+OZH1g== X-CSE-MsgGUID: rU7gl74PRJOVUjN6NjOJ9A== X-IronPort-AV: E=McAfee;i="6700,10204,11453"; a="53673594" X-IronPort-AV: E=Sophos;i="6.16,207,1744095600"; d="scan'208";a="53673594" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Jun 2025 14:33:47 -0700 X-CSE-ConnectionGUID: 3sJOVrcvRSyC6xISR5WQbw== X-CSE-MsgGUID: Ufn66af2SOaQ1oe3eSEqyw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,207,1744095600"; d="scan'208";a="175921904" Received: from tjmaciei-mobl5.ger.corp.intel.com (HELO [10.125.110.192]) ([10.125.110.192]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Jun 2025 14:33:46 -0700 Message-ID: <944968c1-a2a3-430a-bc9a-51ac431a0835@intel.com> Date: Tue, 3 Jun 2025 14:33:46 -0700 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 1/3] x86/mm: Fix potential overflow in user_pcid_flush_mask To: Rik van Riel , linux-kernel@vger.kernel.org Cc: kernel-team@meta.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, bp@alien8.de, x86@kernel.org, yu-cheng.yu@intel.com, Rik van Riel , stable@kernel.org References: <20250602133402.3385163-1-riel@surriel.com> <20250602133402.3385163-2-riel@surriel.com> <83a671ed-4862-4a0f-b91d-d4598b4a82d7@intel.com> <5987ac95e4011c2b71d1c3cce13872571cff3ac7.camel@surriel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 6/3/25 14:20, Rik van Riel wrote: >> Honestly, I'd just leave this out for the bug fix. If someone really >> cares, we can come back and fix it up in mainline. > I added the #ifdef at Ingo's request. > > I am happy to do the code in any way you two can > agree on, but we should probably avoid the back > and forth over many versions thing 🙂 Ingo, I don't think the #ifdef is worth it, especially for what needs to go to stable@. The PTI config option is enabled quite widely, so it's not doing much practically. If you feel strongly that it's required for this series, then it needs to be broken out as a prerequisite and not intermingled with the actual bug fix.