UPSTREAM: mm: Introduce lm_alias
(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
Change-Id: I93ba4ef8df77f7e52717ab6e208d06122ac3a72b
diff --git a/include/linux/mm.h b/include/linux/mm.h
index a4b2d36..cae2445 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -76,6 +76,10 @@
#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.