[PATCH] x86-64: build-time checking

o X86_64 kernel should run from 2MB aligned address for two reasons.
	- Performance.
	- For relocatable kernels, page tables are updated based on difference
	  between compile time address and load time physical address.
	  This difference should be multiple of 2MB as kernel text and data
	  is mapped using 2MB pages and PMD should be pointing to a 2MB
	  aligned address. Life is simpler if both compile time and load time
	  kernel addresses are 2MB aligned.

o Flag the error at compile time if one is trying to build a kernel which
  does not meet alignment restrictions.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/asm-x86_64/page.h b/include/asm-x86_64/page.h
index 40a24d0df090..b17fc16ec2eb 100644
--- a/include/asm-x86_64/page.h
+++ b/include/asm-x86_64/page.h
@@ -78,6 +78,7 @@ extern unsigned long phys_base;
 #endif /* !__ASSEMBLY__ */
 
 #define __PHYSICAL_START        CONFIG_PHYSICAL_START
+#define __KERNEL_ALIGN          0x200000
 #define __START_KERNEL          (__START_KERNEL_map + __PHYSICAL_START)
 #define __START_KERNEL_map      0xffffffff80000000
 #define __PAGE_OFFSET           0xffff810000000000