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Date: Thu, 25 Apr 2019 13:41:37 +0200 From: Peter Zijlstra <peterz@...radead.org> To: David Laight <David.Laight@...LAB.COM> Cc: 'Thomas Gleixner' <tglx@...utronix.de>, 'Fenghua Yu' <fenghua.yu@...el.com>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, H Peter Anvin <hpa@...or.com>, Paolo Bonzini <pbonzini@...hat.com>, Dave Hansen <dave.hansen@...el.com>, Ashok Raj <ashok.raj@...el.com>, Ravi V Shankar <ravi.v.shankar@...el.com>, Xiaoyao Li <xiaoyao.li@...el.com>, Christopherson Sean J <sean.j.christopherson@...el.com>, Kalle Valo <kvalo@...eaurora.org>, Michael Chan <michael.chan@...adcom.com>, linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org> Subject: Re: [PATCH v8 13/15] x86/split_lock: Enable split lock detection by default On Thu, Apr 25, 2019 at 11:13:23AM +0000, David Laight wrote: > I'm not at all sure that 'compare and exchange' operations > are atomic on all cpus if the data is misaligned and crosses > a page boundary and either (or both) pages need faulting in > (or hit a TLB miss). Most sane architectures already trap if you attempt that.
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