Re: [PATCH v3 3/4] x86/efi: print size in binary units in efi_print_memmap

[Andy Shevchenko]

On Thu, 2016-01-28 at 09:29 +0000, Matt Fleming wrote:
> On Tue, 26 Jan, at 01:59:26PM, Andy Shevchenko wrote:
> > On Tue, 2016-01-26 at 11:50 +0000, Matt Fleming wrote:
> > > On Mon, 25 Jan, at 08:37:58PM, Elliott, Robert (Persistent
> > > Memory)
> > > wrote:
> > > > 
> > > > For the UEFI memory map, that was indeed my intention.ÂÂI
> > > > don't want it silently round to "20 GiB".ÂÂEven rounding
> > > > to "19.999 GiB" is imprecise.
> > > 
> > > OK, let's just go with your original patch Robert (minus the @
> > > addr
> > > bit) since it's pretty small and does what we want for this
> > > specific
> > > case.
> > 
> > However I am against this, but seems reviewers do not leave a
> > chance to
> > us, I would propose to copy-and-paste table of binary prefixes and
> > use
> > __ffs64().
> 
> Is there a benefit to this approach other than __ffs64() being
> faster?
> It is a neglibible performance gain anyway because this is hidden
> behind efi=debug, and so by definition you're not looking for ultra
> performance.
> 
> Which makes picking between __ffs64() and non-__ffs64() a wash if
> we're not going to be reusing existing code.

For me it looks cleaner, smaller, thus better to maintenance, and
faster. So, my variant below, though it's up to you what to choose.