From: Anton Blanchard <anton@samba.org>
Date: Mon, 27 Mar 2006 00:46:18 +0000 (+1100)
Subject: [PATCH] powerpc: export validate_sp for oprofile calltrace
X-Git-Tag: firefly_0821_release~36588^2~22
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2f25194dbe0c4b2472ce133ea3e9bcbb14936ae7;p=firefly-linux-kernel-4.4.55.git

[PATCH] powerpc: export validate_sp for oprofile calltrace

Export validate_sp so we can use it in the oprofile calltrace code.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index c6e81bbd615c..706090c99f47 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -770,7 +770,7 @@ out:
 	return error;
 }
 
-static int validate_sp(unsigned long sp, struct task_struct *p,
+int validate_sp(unsigned long sp, struct task_struct *p,
 		       unsigned long nbytes)
 {
 	unsigned long stack_page = (unsigned long)task_stack_page(p);
@@ -808,6 +808,8 @@ static int validate_sp(unsigned long sp, struct task_struct *p,
 #define FRAME_MARKER	2
 #endif
 
+EXPORT_SYMBOL(validate_sp);
+
 unsigned long get_wchan(struct task_struct *p)
 {
 	unsigned long ip, sp;
diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h
index a64198fcfd02..57643b5b782f 100644
--- a/include/asm-powerpc/processor.h
+++ b/include/asm-powerpc/processor.h
@@ -251,6 +251,10 @@ static inline unsigned long __pack_fe01(unsigned int fpmode)
 #define cpu_relax()	barrier()
 #endif
 
+/* Check that a certain kernel stack pointer is valid in task_struct p */
+int validate_sp(unsigned long sp, struct task_struct *p,
+                       unsigned long nbytes);
+
 /*
  * Prefetch macros.
  */