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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>
This commit is contained in:
Michael Ellerman 2017-03-29 23:10:34 +11:00
parent 941711a3a0
commit 85beb1c486
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/include/asm/book3s/64/mmu-hash.h
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@ -682,6 +682,9 @@ static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize)
{
unsigned long context;
if (!is_kernel_addr(ea))
return 0;
/*
* For kernel space, we use context ids 1-4 to map the address space as
* below: