Re: [PATCH 1 of 3] Introduce __memcpy_toio32

[Roland Dreier <rdreier@cisco.com>]

A couple of comments here:

 > +/*
 > + * Copy data to an MMIO region.  MMIO space accesses are performed
 > + * in the sizes indicated in each function's name.
 > + */
 > +void fastcall __memcpy_toio32(volatile void __iomem *d, const void *s, size_t count)
 > +{
 > +	volatile u32 __iomem *dst = d;
 > +	const u32 *src = s;
 > +
 > +	while (--count >= 0) {
 > +		__raw_writel(*src++, dst++);
 > +	}

I think the principle of least surprise calls for memcpy_toio32 to be
ordered the same way memcpy_toio is.  In other words there should be a
wmb() after the loop.

Also, no need for the { } for the while loop.

 > +}
 > +
 > +EXPORT_SYMBOL_GPL(__memcpy_toio32);

You're adding this symbol and exporting it even if the arch will
supply its own version.  So this is pure kernel .text bloat...

 - R.