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X-CSE-ConnectionGUID: TQb2iiA1Qdqx9gahTT0mIw== X-CSE-MsgGUID: Zhlosl88SlS6lGoMUUf+kg== X-IronPort-AV: E=McAfee;i="6700,10204,11307"; a="40016539" X-IronPort-AV: E=Sophos;i="6.12,293,1728975600"; d="scan'208";a="40016539" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jan 2025 09:29:35 -0800 X-CSE-ConnectionGUID: 1FsBwZ5LQNOoS0xlIMuVQQ== X-CSE-MsgGUID: xyEwL5VXTXithg3p24ClwA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,293,1728975600"; d="scan'208";a="107361916" Received: from lbogdanm-mobl3.ger.corp.intel.com (HELO [10.124.220.224]) ([10.124.220.224]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jan 2025 09:29:33 -0800 Message-ID: <194072ff-32af-4a5d-8e73-0a45f75290e7@intel.com> Date: Mon, 6 Jan 2025 09:29:33 -0800 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 07/12] x86/tlb: use INVLPGB in flush_tlb_all To: Rik van Riel , x86@kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, akpm@linux-foundation.org, nadav.amit@gmail.com, zhengqi.arch@bytedance.com, linux-mm@kvack.org References: <20241230175550.4046587-1-riel@surriel.com> <20241230175550.4046587-8-riel@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: 7bit On 12/30/24 09:53, Rik van Riel wrote: > --- a/arch/x86/mm/tlb.c > +++ b/arch/x86/mm/tlb.c > @@ -1074,6 +1074,12 @@ static void do_flush_tlb_all(void *info) > void flush_tlb_all(void) > { > count_vm_tlb_event(NR_TLB_REMOTE_FLUSH); > + if (cpu_feature_enabled(X86_FEATURE_INVLPGB)) { > + guard(preempt)(); > + invlpgb_flush_all(); > + tlbsync(); > + return; > + } After seeing a few of these, I'd really prefer that the preempt and tlbsync() logic be hidden in the invlpgb_*() helper, or *a* helper at least. This would be a lot easier on the eyes if it were something like: flushed = invlpgb_flush_all(); if (flushed) return; or even: if (cpu_feature_enabled(X86_FEATURE_INVLPGB)) { invlpgb_flush_all(); return; }