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From: "Luck, Tony" <tony.luck@intel.com>
To: "hpa@zytor.com" <hpa@zytor.com>,
	Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@suse.de>,
	Andy Lutomirski <luto@kernel.org>,
	"x86@kernel.org" <x86@kernel.org>
Cc: "Hansen, Dave" <dave.hansen@intel.com>,
	"Zhang, Cathy" <cathy.zhang@intel.com>,
	"Yu, Fenghua" <fenghua.yu@intel.com>,
	"Park, Kyung Min" <kyung.min.park@intel.com>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	"Shankar, Ravi V" <ravi.v.shankar@intel.com>,
	"Christopherson, Sean J" <sean.j.christopherson@intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Neri, Ricardo" <ricardo.neri@intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>
Subject: RE: [PATCH 4/4] x86/cpu: Use SERIALIZE in sync_core() when available
Date: Mon, 27 Jul 2020 16:27:18 +0000
Message-ID: <3908561D78D1C84285E8C5FCA982C28F7F6B0D4A@ORSMSX115.amr.corp.intel.com> (raw)
In-Reply-To: <D51F2DC3-3C56-44E6-A1F2-434E7D27133C@zytor.com>

> For a really overenginered solution, but which might perform unnecessary poorly on existing hardware:
>
> asm volatile("1: .byte 0xf, 0x1, 0xe8; 2:"
>                        _ASM_EXTABLE(1b,2b));

You win the prize for the smallest code.  Might need (the already large) comment to double
in size to explain the subtleties!

-Tony

  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200727043132.15082-1-ricardo.neri-calderon@linux.intel.com>
2020-07-27  4:31 ` [PATCH 1/4] x86/cpufeatures: Add enumeration for SERIALIZE instruction Ricardo Neri
2020-07-27  4:31 ` [PATCH 2/4] x86/cpu: Relocate sync_core() to sync_core.h Ricardo Neri
2020-07-27  4:31 ` [PATCH 3/4] x86/cpu: Refactor sync_core() for readability Ricardo Neri
2020-07-27  4:31 ` [PATCH 4/4] x86/cpu: Use SERIALIZE in sync_core() when available Ricardo Neri
2020-07-27  5:55   ` hpa
2020-07-27  6:00     ` hpa
2020-07-27  8:36     ` peterz
2020-07-27 12:49       ` hpa
2020-07-27 13:05         ` peterz
2020-07-27 13:30           ` peterz
2020-07-28  4:41             ` Ricardo Neri
2020-07-28  8:50               ` peterz
2020-07-27 16:27     ` Luck, Tony [this message]
2020-07-27  8:20   ` peterz
2020-07-27 12:47     ` hpa
2020-07-28  0:55       ` Ricardo Neri
2020-07-28  0:36     ` Ricardo Neri
2020-07-27  8:23   ` peterz

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