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
Bug: 63737556
Change-Id: I93ba4ef8df77f7e52717ab6e208d06122ac3a72b

diff --git a/include/linux/mm.h b/include/linux/mm.h
index e51aafb..941c7f7 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -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.