From: Mark Rutland <mark.rutland@arm.com>
Date: Thu, 12 Apr 2018 11:11:15 +0000 (+0100)
Subject: mm: Introduce lm_alias
X-Git-Tag: v4.9.95~42
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=09ea80a05c6a08d0419fa3875a2612f4c462d9d5;p=platform%2Fkernel%2Flinux-amlogic.git

mm: Introduce lm_alias


From: Laura Abbott <labbott@redhat.com>

commit 568c5fe5a54f2654f5a4c599c45b8a62ed9a2013 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: Mark Rutland <mark.rutland@arm.com> [v4.9 backport]
Tested-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.