mm: Introduce lm_alias

labbott · wildea01 · commit 568c5fe5a54f · 2017-01-11T13:56:49.000Z
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 &lt;mark.rutland@arm.com&gt;
Tested-by: Mark Rutland &lt;mark.rutland@arm.com&gt;
Signed-off-by: Laura Abbott &lt;labbott@redhat.com&gt;
Signed-off-by: Will Deacon &lt;will.deacon@arm.com&gt;
diff --git a/include/linux/mm.h b/include/linux/mm.h
@@ -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.
