From: Laura Abbott <labbott@redhat.com>
Date: Tue, 10 Jan 2017 21:35:42 +0000 (-0800)
Subject: mm: Introduce lm_alias
X-Git-Tag: C0P2-H0.0--20200415~126
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=a14810370215a9be32f4475b576253fda6580ae9;p=linux.git

mm: Introduce lm_alias

commit 568c5fe5a54 upstream.

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>
Signed-off-by: Alex Shi <alex.shi@linaro.org>
---

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8e506783631b..4a07ff4f38e1 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)))
 #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.