kernel: Replace timeconst.pl with a bc script

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bc is the standard tool for multi-precision arithmetic.  We switched
to Perl because akpm reported a hard-to-reproduce build hang, which
was very odd because affected and unaffected machines were all running
the same version of GNU bc.

Unfortunately switching to Perl required a really ugly "canning"
mechanism to support Perl < 5.8 installations lacking the Math::BigInt
module.

It was recently pointed out to me that some very old versions of GNU
make had problems with pipes in subshells, which was indeed the
construct used in the Makefile rules in that version of the patch;
Perl didn't need it so switching to Perl fixed the problem for
unrelated reasons.  With the problem (hopefully) root-caused, we can
switch back to bc and do the arbitrary-precision arithmetic naturally.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>

...

This commit is contained in:

H. Peter Anvin 2013-02-14 15:13:55 -08:00 • committed by Michal Marek

parent 6543becf26

commit 70730bca13

3 changed files with 120 additions and 382 deletions

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16

kernel/Makefile

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108

kernel/timeconst.bc

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378

kernel/timeconst.pl

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