linux-kernel - Re: [PATCH v2 0/2] add support for new persistent memory instructions

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Message-ID: <54C69DF9.1090702@intel.com>
Date:	Mon, 26 Jan 2015 12:05:13 -0800
From:	"H. Peter Anvin" <h.peter.anvin@...el.com>
To:	Ross Zwisler <ross.zwisler@...ux.intel.com>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH v2 0/2] add support for new persistent memory instructions

On 01/26/2015 11:51 AM, Ross Zwisler wrote:
> 
> This is fine, but now you've got two fences in a row.  Another slightly more
> messy choice would be to include the fence in the pcommit assembly, so
> you either get pcommit + sfence or a pair of NOPs.
> 

If that is the required usage pattern, it should be part of the clwb()
inline at least.

	-hpa

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