powerpc/64: Avoid panic during boot due to divide by zero in init_cache_info()

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I see a panic in early boot when building with a recent gcc toolchain.
The issue is a divide by zero, which is undefined. Older toolchains
let us get away with it:

int foo(int a) { return a / 0; }

foo:
	li 9,0
	divw 3,3,9
	extsw 3,3
	blr

But newer ones catch it:

foo:
	trap

Add a check to avoid the divide by zero.

Fixes: e2827fe5c1 ("powerpc/64: Clean up ppc64_caches using a struct per cache")
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

...

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Anton Blanchard 2017-03-05 10:54:34 +11:00 • committed by Michael Ellerman

parent 014d02cbf1

commit 6ba422c75f

1 changed files with 4 additions and 1 deletions

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arch/powerpc/kernel/setup_64.c

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