[POWERPC] Discourage people from fiddling with kernel data from prom_init

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As BenH said the other day, it is an "accident" that prom_init.o is
linked with the rest of the kernel.  The truth is a little more
subtle, prom_init isn't truly bootloader, it does access kernel data
in a few places.

What we can do is discourage people from adding new code that accesses
data outside of prom_init.  And hence this patch; from the script:

 # This script checks prom_init.o to see what external symbols it
 # is using, if it finds symbols not in the whitelist it returns
 # an error. The point of this is to discourage people from
 # intentionally or accidentally adding new code to prom_init.c
 # which has side effects on other parts of the kernel.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

...

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Michael Ellerman 2008-04-24 12:08:22 +10:00 • committed by Paul Mackerras

parent d9e9d82c24

commit 5c02cd2fb8

2 changed files with 67 additions and 0 deletions

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9

arch/powerpc/kernel/Makefile

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58

arch/powerpc/kernel/prom_init_check.sh

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