powerpc/mm/hash: Check for non-kernel address in get_kernel_vsid()

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get_kernel_vsid() has a very stern comment saying that it's only valid
for kernel addresses, but there's nothing in the code to enforce that.

Rather than hoping our callers are well behaved, add a check and return
a VSID of 0 (invalid).

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Michael Ellerman 2017-03-29 23:10:34 +11:00

parent 941711a3a0

commit 85beb1c486

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arch/powerpc/include/asm/book3s/64/mmu-hash.h

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