From: peterz@infradead.org
To: hpa@zytor.com
Cc: 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, Dave Hansen <dave.hansen@intel.com>,
Tony Luck <tony.luck@intel.com>,
Cathy Zhang <cathy.zhang@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
Kyung Min Park <kyung.min.park@intel.com>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
linux-kernel@vger.kernel.org,
Ricardo Neri <ricardo.neri@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
linux-edac@vger.kernel.org
Subject: Re: [PATCH 4/4] x86/cpu: Use SERIALIZE in sync_core() when available
Date: Mon, 27 Jul 2020 10:36:19 +0200 [thread overview]
Message-ID: <20200727083619.GF119549@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <D51F2DC3-3C56-44E6-A1F2-434E7D27133C@zytor.com>
On Sun, Jul 26, 2020 at 10:55:15PM -0700, hpa@zytor.com wrote:
> 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));
Ha! cute, you take an #UD ?
We could optimize the #UD exception handler for this I suppose, but that
makes it an even worse hack. The simple alternative() seems like a much
simpler approach.
next prev parent reply other threads:[~2020-07-27 8:36 UTC|newest]
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 [this message]
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
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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