Commit 85beb1c4 authored Mar 29, 2017 by Michael Ellerman

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



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>

parent 941711a3

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

+3 −0

Original line number	Diff line number	Diff line
		@@ -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: