[PATCH v2 0/3] ARM: NEON based fast(er) AES in CBC/CTR/XTS modes

[Russell King - ARM Linux]

On Fri, Oct 04, 2013 at 08:41:35PM +0200, Ard Biesheuvel wrote:
> On 4 October 2013 20:34, Nicolas Pitre <nicolas.pitre at linaro.org> wrote:
> > On Fri, 4 Oct 2013, Will Deacon wrote:
> [...]
> >>
> >> Why do you consider it unsuitable to ship the perl script with the kernel?
> >> Perl 5 is already documented as a build dependency in Documentation/Changes
> >
> > Do you have an example of something that does require perl to build the
> > kernel on ARM?  I was under the impression that people try to avoid it
> > as much as possible in general.
> >
> > I'm personally sitting on the fence between effectively adding a new
> > kernel build dependencies or carrying the output of the perl script.
> > But if the kernel build does already require perl in practice then this
> > might tip the balance.
> >
> 
> I like Russell's suggestion the most, in fact. In this case, the build
> time requirement for Perl effectively gets suspended until you start
> making modifications to the perl script, and the relation between the
> .S and the .pl files is made explicit by the make rule.
> 
> Should I put the cmd_perl rule in scripts/Makefile.build ? Or can I
> just keep it under arch/arm/crypto ?

Just running through the Makefiles, it seems we have a fair amount
of stuff already using perl in various ways.  So I wouldn't worry too
much about where it's placed.  It's probably something that should
eventually end up in scripts/ at _some_ point.