linux-kernel - Re: [PATCH 2/6] x86: clean up conditional pmem includes

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Message-ID: <1438956522.17630.1.camel@linux.intel.com>
Date:	Fri, 07 Aug 2015 08:08:42 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-kernel@...r.kernel.org, linux-nvdimm@...1.01.org,
	dan.j.williams@...el.com, Juergen Gross <jgross@...e.com>,
	x86@...nel.org, Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/6] x86: clean up conditional pmem includes

On Thu, 2015-08-06 at 23:39 -0700, Christoph Hellwig wrote:
> On Thu, Aug 06, 2015 at 11:43:16AM -0600, Ross Zwisler wrote:
> > Prior to this change x86_64 used the pmem defines in
> > arch/x86/include/asm/cacheflush.h, and UM used the default ones at the
> > top of include/linux/pmem.h.  The inclusion or exclusion in pmem.h was
> > controlled by CONFIG_ARCH_HAS_PMEM_API, but the ones in cacheflush.h
> > were controlled by ARCH_HAS_NOCACHE_UACCESS.
> > 
> > Instead, control them both with CONFIG_ARCH_HAS_PMEM_API so that it's
> > clear that they are related and we don't run into the possibility where
> > they are both included or excluded.  Also remove a bunch of stale
> > function prototypes meant for UM in cacheflush.h - these just conflicted
> > with the inline defaults in pmem.h, and gave compile errors:
> 
> This looks reasonable, but can you use the opportunity to also move
> the pmem arch inlines from asm/cacheflush.h to a new asm/pmem.h?

Sure, it that seems like a good idea.  Thanks.



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