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UPSTREAM: mm: Introduce lm_alias

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(cherry-pick from commit 568c5fe5a54f2654f5a4c599c45b8a62ed9a2013)

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>
Bug: 20045882
Bug: 63737556
Change-Id: I93ba4ef8df77f7e52717ab6e208d06122ac3a72b
This commit is contained in:
Laura Abbott 2017-01-10 13:35:42 -08:00 • committed by Mark Salyzyn
parent 7eab308a49
commit b11250d2ad
1 changed files with 4 additions and 0 deletions
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4
include/linux/mm.h
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@ -70,6 +70,10 @@ extern int mmap_rnd_compat_bits __read_mostly;
#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
#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.