[POWERPC] Document when printk is useable

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When debugging early boot problems, it's common to sprinkle printk's
all over the place.  However, on 64-bit powerpc, this can lead to
memory corruption if done too early due to the PACA pointer and
lockdep core not being initialized.

This adds some comments to early_setup() that document when it is
safe to do so in order to save time for whoever has to debug that
stuff next.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

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Benjamin Herrenschmidt 2008-05-07 10:00:56 +10:00 • committed by Paul Mackerras

parent 1b70c5a649

commit 24d9649574

1 changed files with 4 additions and 0 deletions

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arch/powerpc/kernel/setup_64.c

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