x86-64: Add prototype for old_rsp to a header file
authorH. J. Lu <hjl.tools@gmail.com>
Tue, 14 Feb 2012 21:49:48 +0000 (13:49 -0800)
committerH. Peter Anvin <hpa@zytor.com>
Mon, 20 Feb 2012 20:48:48 +0000 (12:48 -0800)
So far this has only been used in process_64.c, but the x32 code will
need it in additional code.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
arch/x86/include/asm/processor.h

index 9f748b5..e34f951 100644 (file)
@@ -948,6 +948,12 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk);
 
 #define task_pt_regs(tsk)      ((struct pt_regs *)(tsk)->thread.sp0 - 1)
 extern unsigned long KSTK_ESP(struct task_struct *task);
+
+/*
+ * User space RSP while inside the SYSCALL fast path
+ */
+DECLARE_PER_CPU(unsigned long, old_rsp);
+
 #endif /* CONFIG_X86_64 */
 
 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,