* [PATCH 01/52] mm: Introduce lm_alias
[not found] <1519633227-29832-1-git-send-email-alex.shi@linaro.org>
@ 2018-02-26 8:19 ` Alex Shi
0 siblings, 0 replies; only message in thread
From: Alex Shi @ 2018-02-26 8:19 UTC (permalink / raw)
To: Marc Zyngier, Will Deacon, Ard Biesheuvel, Catalin Marinas,
stable, open list:MEMORY MANAGEMENT, open list
Cc: Laura Abbott
From: Laura Abbott <labbott@redhat.com>
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>
---
include/linux/mm.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2217e2f..edd2480 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.
--
2.7.4
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