Re: [PATCH] reduce export symbol CRC table size on 64-bit archs

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Jon Masters wrote:
On Mon, 2009-07-13 at 09:44 +0100, Jan Beulich wrote:
Michal Marek <mmarek@xxxxxxx> 13.07.09 10:11 >>>
Jan Beulich napsal(a):
Actually I meanwhile think that module-init-tools can easily detect the changed
layout without any further kernel side adjustments: Since it is known that a
CRC always is a 32-bit value, simply checking whether the so-far-used 64-bit
value has more than 32 significant bits should suffice: If so, the new layout
is being used (with the symbol name starting at offset 4), else the old one is
in effect (name at offset 8). This ought to be a pretty trivial change to that
But old module-init-tools will continue reading garbage in this case.

Most of the distros can fix that with a dependency on the kernel package
in the absolute worst case, not that I love that idea, but it happens. I
assume for now we are going with detecting the two possibilities because
it doesn't really hurt in any case to have this support.

It would seem to me that reading garbage is worse than reading nothing, unless I'm missing something fundamental.


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