linux-kernel - Re: [PATCH v4 6/6] arch, x86: pmem api for ensuring durability of persistent memory updates

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Message-ID: <20150617113121.GC9246@lst.de>
Date:	Wed, 17 Jun 2015 13:31:21 +0200
From:	Christoph Hellwig <hch@....de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	arnd@...db.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
	tglx@...utronix.de, ross.zwisler@...ux.intel.com,
	akpm@...ux-foundation.org, jgross@...e.com, x86@...nel.org,
	toshi.kani@...com, linux-nvdimm@...ts.01.org,
	benh@...nel.crashing.org, mcgrof@...e.com, konrad.wilk@...cle.com,
	linux-kernel@...r.kernel.org, stefan.bader@...onical.com,
	luto@...capital.net, linux-mm@...ck.org, geert@...ux-m68k.org,
	ralf@...ux-mips.org, hmh@....eng.br, mpe@...erman.id.au,
	tj@...nel.org, paulus@...ba.org, hch@....de
Subject: Re: [PATCH v4 6/6] arch, x86: pmem api for ensuring durability of
	persistent memory updates

This mess with arch_ methods and an ops vecor is almost unreadable.

What's the problem with having something like:

pmem_foo()
{
	if (arch_has_pmem)		// or sync_pmem
		arch_pmem_foo();
	generic_pmem_foo();
}

This adds a branch at runtime, but that shoudn't really be any slower
than an indirect call on architectures that matter.

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