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[01/39] mm: Introduce lm_alias

Message ID 20180309090722.26279-2-alex.shi@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Alex Shi March 9, 2018, 9:06 a.m. UTC 
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 | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 55f950afb60d..648f14335a9b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -59,6 +59,14 @@  extern int sysctl_legacy_va_layout;
 #define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
 #endif
 
+#ifndef page_to_virt
+#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.