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UPSTREAM: mm: Introduce lm_alias

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(cherry-pick from commit 568c5fe5a5)

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
Change-Id: I93ba4ef8df77f7e52717ab6e208d06122ac3a72b
This commit is contained in:
Laura Abbott
2017-01-10 13:35:42 -08:00
committed by Mark Salyzyn
parent 44a3afcce1
commit 845fbd8e99
1 changed files with 4 additions and 0 deletions
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4
include/linux/mm.h
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@@ -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.