Commit 09ea80a0 authored Apr 12, 2018 by Mark Rutland Committed by Greg Kroah-Hartman Apr 20, 2018

mm: Introduce lm_alias




From: Laura Abbott <labbott@redhat.com>

commit 568c5fe5a54f2654f5a4c599c45b8a62ed9a2013 upstream.

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>
Signed-off-by: Mark Rutland <mark.rutland@arm.com> [v4.9 backport]
Tested-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent bfaccecc

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.