x86-64: reduce symbol table size

With all of Xen's symbols sitting within a 2Gb range on x86-64, they
can be referred to by the kallsyms-like offset table using 4- instead
of 8-byte slots.

The marker table can use 4-byte slots in all cases, just like the
table entry counts can (though that's only a minor improvement).

If ia64's PERCPU_ADDR got moved down to (KERNEL_START + 2Gb -
PERCPU_PAGE_SIZE), it could also utilize the more compact form.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

1 files changed, 10 insertions, 6 deletions

diff --git a/xen/common/symbols-dummy.c b/xen/common/symbols-dummy.c
index 562264f4e7..5090c3b4d7 100644
--- a/xen/common/symbols-dummy.c
+++ b/xen/common/symbols-dummy.c
@@ -6,11 +6,15 @@
 #include <xen/config.h>
 #include <xen/types.h>
 
-unsigned long symbols_addresses[1];
-unsigned long symbols_num_syms;
-u8 symbols_names[1];
+#ifdef SYMBOLS_ORIGIN
+const unsigned int symbols_offsets[1];
+#else
+const unsigned long symbols_addresses[1];
+#endif
+const unsigned int symbols_num_syms;
+const u8 symbols_names[1];
 
-u8 symbols_token_table[1];
-u16 symbols_token_index[1];
+const u8 symbols_token_table[1];
+const u16 symbols_token_index[1];
 
-unsigned long symbols_markers[1];
+const unsigned int symbols_markers[1];