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SubjectRe: [PATCH 1 of 3] Introduce __memcpy_toio32
On Wed, Dec 28, 2005 at 08:51:14AM -0600, Matt Mackall wrote:
> On Wed, Dec 28, 2005 at 06:40:03AM -0800, Bryan O'Sullivan wrote:
> > On Tue, 2005-12-27 at 17:10 -0800, Roland Dreier wrote:
> >
> > > 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.
> >
> > Will do.
> >
> > > Also, no need for the { } for the while loop.
> >
> > Fine. There doesn't seem to be much consistency in whether to use
> > curlies for single-line blocks.
> We've been very consistent in discouraging it in new code. Enforcement
> of fine points of coding style is a post-2.5 phenomenon, so it hasn't
> hit all the tree yet.
> > > You're adding this symbol and exporting it even if the arch will
> > > supply its own version. So this is pure kernel .text bloat...
> >
> > I don't know what you'd prefer, so let me enumerate a few alternatives,
> > and you can either tell me which you'd prefer, or point out something
> > I've missed that would be even better. I'm entirely flexible on this.
> >
> > * Use the __HAVE_ARCH_* mechanism that include/asm-*/string.h
> > uses. Caveat: Linus has lately come out as hating this style.
> > It makes for the smallest patch, though.
> > * Define the generic code in lib/, and have each arch that really
> > uses it export it.
> I'd favor this, at least for this case. If it becomes more widely
> used, we'll relocate the export.

I don't like this for two reasons:
- we are moving exports to the actual functions and steadily killing all
*syms* files
- the lib-y approach has the disadvantage of completely omitting the
function if it's used only in modules resulting in non-working

Where's the problem with the __HAVE_ARCH_* mechanism?



"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed

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