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ftrace: allow archs to preform pre and post process for code modification

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This patch creates the weak functions: ftrace_arch_code_modify_prepare
and ftrace_arch_code_modify_post_process that are called before and
after the stop machine is called to modify the kernel text.

If the arch needs to do pre or post processing, it only needs to define
these functions.

[ Update: Ingo Molnar suggested using the name ftrace_arch_code_modify_*
          over using ftrace_arch_modify_* ]

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt 2009-02-17 13:35:06 -05:00
parent 07a66d7c53
commit 000ab69117
2 changed files with 31 additions and 0 deletions
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3
include/linux/ftrace.h
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@ -99,6 +99,9 @@ stack_trace_sysctl(struct ctl_table *table, int write,
/* asm/ftrace.h must be defined for archs supporting dynamic ftrace */
#include <asm/ftrace.h>
int ftrace_arch_code_modify_prepare(void);
int ftrace_arch_code_modify_post_process(void);
enum {
FTRACE_FL_FREE = (1 << 0),
FTRACE_FL_FAILED = (1 << 1),