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[PATCHv7,03/11] mm: Introduce lm_alias

Message ID 1484084150-1523-4-git-send-email-labbott@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Laura Abbott Jan. 10, 2017, 9:35 p.m. UTC 
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>
---
 include/linux/mm.h | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

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)))
 #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.