[kernel-hardening] [PATCH 21/30] ARM: mm: export default vmalloc base address

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

In order for the EFI stub to be able to decide over what range to
randomize the load address of the kernel, expose the definition of
the default vmalloc base address as VMALLOC_DEFAULT_BASE.

Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 arch/arm/include/asm/pgtable.h | 1 +
 arch/arm/mm/mmu.c              | 3 +--
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 1c462381c225..a0d4a63a6516 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -45,6 +45,7 @@
 #define VMALLOC_OFFSET		(8*1024*1024)
 #define VMALLOC_START		(((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define VMALLOC_END		0xff800000UL
+#define VMALLOC_DEFAULT_BASE	(VMALLOC_END - (240 << 20) - VMALLOC_OFFSET)
 
 #define LIBRARY_TEXT_START	0x0c000000
 
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index e46a6a446cdd..566f7e657931 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1128,8 +1128,7 @@ void __init debug_ll_io_init(void)
 }
 #endif
 
-static void * __initdata vmalloc_min =
-	(void *)(VMALLOC_END - (240 << 20) - VMALLOC_OFFSET);
+static void * __initdata vmalloc_min = (void *)VMALLOC_DEFAULT_BASE;
 
 /*
  * vmalloc=size forces the vmalloc area to be exactly 'size'
-- 
2.11.0