x86-64, vdso: Do not allocate memory for the vDSO
We can map the vDSO straight from kernel data, saving a few page
allocations. As an added bonus, the deleted code contained a memory
leak.
Signed-off-by: Andy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/2c4ed5c2c2e93603790229e0c3403ae506ccc0cb.1311277573.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/x86/vdso/vdso.S b/arch/x86/vdso/vdso.S
index 1d3aa6b..1b979c1 100644
--- a/arch/x86/vdso/vdso.S
+++ b/arch/x86/vdso/vdso.S
@@ -1,10 +1,21 @@
+#include <asm/page_types.h>
+#include <linux/linkage.h>
#include <linux/init.h>
-__INITDATA
+__PAGE_ALIGNED_DATA
.globl vdso_start, vdso_end
+ .align PAGE_SIZE
vdso_start:
.incbin "arch/x86/vdso/vdso.so"
vdso_end:
-__FINIT
+.previous
+
+ .globl vdso_pages
+ .bss
+ .align 8
+ .type vdso_pages, @object
+vdso_pages:
+ .zero (vdso_end - vdso_start + PAGE_SIZE - 1) / PAGE_SIZE * 8
+ .size vdso_pages, .-vdso_pages