[PATCH v2] x86/efi: Clean up a minor mistake in code comment

[Baoquan He]

EFI allocate runtime services regions from EFI_VA_START, -4G, down
to -68G, EFI_VA_END, 64G altogether. The mechanism was introduced in
commit d2f7cbe7b26a7 ("x86/efi: Runtime services virtual mapping").

Clean it up to avoid confusion.

Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
---
v1->v2:
  Update patch log to corret a description mistake Ard pointed out.

 arch/x86/platform/efi/efi_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index a4695da..6cbf9e0 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -47,7 +47,7 @@
 #include <asm/pgalloc.h>
 
 /*
- * We allocate runtime services regions bottom-up, starting from -4G, i.e.
+ * We allocate runtime services regions top-down, starting from -4G, i.e.
  * 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G.
  */
 static u64 efi_va = EFI_VA_START;
-- 
2.5.5