[PATCHv7 03/11] mm: Introduce lm_alias

Laura Abbott labbott at redhat.com
Tue Jan 10 13:35:42 PST 2017

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 at arm.com>
Tested-by: Mark Rutland <mark.rutland at arm.com>
Signed-off-by: Laura Abbott <labbott at redhat.com>
 include/linux/mm.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index fe6b403..5dc9c46 100644
--- 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)))
+#ifndef lm_alias
+#define lm_alias(x)	__va(__pa_symbol(x))
  * To prevent common memory management code establishing
  * a zero page mapping on a read fault.

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