linux-kernel - Re: [RFC PATCH] x86, uaccess, pmem: introduce copy_from_iter

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Message-ID: <20170427063054.soejyqocqqrihfdw@gmail.com>
Date:   Thu, 27 Apr 2017 08:30:54 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     viro@...iv.linux.org.uk, Jan Kara <jack@...e.cz>,
        Matthew Wilcox <mawilcox@...rosoft.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, hch@....de,
        linux-block@...r.kernel.org, linux-nvdimm@...ts.01.org,
        Jeff Moyer <jmoyer@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-fsdevel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [RFC PATCH] x86, uaccess, pmem: introduce
 copy_from_iter_writethru for dax + pmem


* Dan Williams <dan.j.williams@...el.com> wrote:

> +#ifdef CONFIG_ARCH_HAS_UACCESS_WRITETHRU
> +#define __HAVE_ARCH_MEMCPY_WRITETHRU 1
> +void memcpy_writethru(void *dst, const void *src, size_t cnt);
> +#endif

This should be named memcpy_wt(), which is the well-known postfix for 
write-through.

We already have ioremap_wt(), set_memory_wt(), etc. - no need to introduce a 
longer variant with uncommon spelling.

Thanks,

	Ingo