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SubjectRe: [PATCH] Fix corruption of CONFIG_X86_32 in 'make oldconfig'

* David Woodhouse <dwmw2@infradead.org> wrote:

> On Mon, 2011-05-30 at 12:58 +0200, Ingo Molnar wrote:
> >
> > * Theodore Tso <tytso@MIT.EDU> wrote:
> >
> > > I'd think that "make ARCH=x86_64 oldconfig"
> > >
> > > ... where the old configuration contained CONFIG_X86_32
> > > should trigger a warning, if not an outright error that
> > > stops the build....
> >
> > That would be a rather sad regression for me: i use that command
> > regularly to transform .configs that came in bugreports into a config
> > suitable for a testbox that has a different bitness userspace
> > installed.
>
> And if it has a different SCSI or ATA controller? Then you need
> something like:
>
> 'make CONFIG_SATA_MV=y oldconfig'
>
> to make your config actually useful.

When it wont boot straight away (often it does) i use a
Kconfig-needed set of minimal set of configs that enables the minimal
hardware environment.

But bitness is not really a 'hardware environment' thing - it's a CPU
mode thing that i want to match to 32-bit or 64-bit user-space,
depending on which one i want to boot.

So bitness *is* special, even if we ignored all the well-established
workflows where people became to rely on (and appreciate) what
ARCH=i386 and ARCH=x86_64 specifiers give us today and which ARCH=x86
does not replace in an equivalent fashion.

Thanks,

Ingo


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