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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2019-11-14 14:39:35 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-11-14 22:45:47 -0500
commit0567d6809182df53da03636fad36c507c5cf07a5 (patch)
treefc9c3c407546b885a43fc68180e0851b219d3b3f /include/linux/ftrace.h
parent36b3615dc3b625c8b587f34e413a600f7ac16403 (diff)
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ftrace: Add modify_ftrace_direct()
Add a new function modify_ftrace_direct() that will allow a user to update an existing direct caller to a new trampoline, without missing hits due to unregistering one and then adding another. Link: https://lore.kernel.org/r/20191109022907.6zzo6orhxpt5n2sv@ast-mbp.dhcp.thefacebook.com Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace.h')
-rw-r--r--include/linux/ftrace.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 55647e185141..73eb2e93593f 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -250,6 +250,7 @@ static inline void ftrace_free_mem(struct module *mod, void *start, void *end) {
extern int ftrace_direct_func_count;
int register_ftrace_direct(unsigned long ip, unsigned long addr);
int unregister_ftrace_direct(unsigned long ip, unsigned long addr);
+int modify_ftrace_direct(unsigned long ip, unsigned long old_addr, unsigned long new_addr);
struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr);
#else
# define ftrace_direct_func_count 0
@@ -261,6 +262,11 @@ static inline int unregister_ftrace_direct(unsigned long ip, unsigned long addr)
{
return -ENODEV;
}
+static inline int modify_ftrace_direct(unsigned long ip,
+ unsigned long old_addr, unsigned long new_addr)
+{
+ return -ENODEV;
+}
static inline struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr)
{
return NULL;