Commit 568c5fe5 authored Jan 10, 2017 by Laura Abbott Committed by Will Deacon Jan 11, 2017

mm: Introduce lm_alias



Certain architectures may have the kernel image mapped separately to
alias the linear map. Introduce a macro lm_alias to translate a kernel
image symbol into its linear alias. This is used in part with work to
add CONFIG_DEBUG_VIRTUAL support for arm64.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

parent 2dece445

include/linux/mm.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -76,6 +76,10 @@ extern int mmap_rnd_compat_bits __read_mostly;
		#define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x)))
		#endif

		#ifndef lm_alias
		#define lm_alias(x) __va(__pa_symbol(x))
		#endif

		/*
		* To prevent common memory management code establishing
		* a zero page mapping on a read fault.