Commit da6e4cb6 authored Apr 15, 2014 by Dave Anderson Committed by Catalin Marinas May 03, 2014

arm64: Fix for the arm64 kern_addr_valid() function



Fix for the arm64 kern_addr_valid() function to recognize
virtual addresses in the kernel logical memory map.  The
function fails as written because it does not check whether
the addresses in that region are mapped at the pmd level to
2MB or 512MB pages, continues the page table walk to the
pte level, and issues a garbage value to pfn_valid().

Tested on 4K-page and 64K-page kernels.

Signed-off-by: Dave Anderson <anderson@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

parent d1db0eea

arch/arm64/mm/mmu.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -374,6 +374,9 @@ int kern_addr_valid(unsigned long addr)
		if (pmd_none(*pmd))
		return 0;

		if (pmd_sect(*pmd))
		return pfn_valid(pmd_pfn(*pmd));

		pte = pte_offset_kernel(pmd, addr);
		if (pte_none(*pte))
		return 0;

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