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ftrace: cleanup ftrace_graph_caller enable and disable

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The ftrace_[enable,disable]_ftrace_graph_caller() are used to do
special hooks for graph tracer, which are not needed on some ARCHs
that use graph_ops:func function to install return_hooker.

So introduce the weak version in ftrace core code to cleanup
in x86.

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20220420160006.17880-1-zhouchengming@bytedance.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Chengming Zhou 2022-04-21 00:00:05 +08:00 committed by Catalin Marinas
parent b2d229d4dd
commit e999995c84
2 changed files with 20 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
arch/x86/kernel/ftrace.c
View File

@ -579,9 +579,7 @@ void arch_ftrace_trampoline_free(struct ftrace_ops *ops)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
#ifdef CONFIG_DYNAMIC_FTRACE
#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
#if defined(CONFIG_DYNAMIC_FTRACE) && !defined(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS)
extern void ftrace_graph_call(void);
static const char *ftrace_jmp_replace(unsigned long ip, unsigned long addr)
{
@ -610,18 +608,7 @@ int ftrace_disable_ftrace_graph_caller(void)
return ftrace_mod_jmp(ip, &ftrace_stub);
}
#else /* !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
int ftrace_enable_ftrace_graph_caller(void)
{
return 0;
}
int ftrace_disable_ftrace_graph_caller(void)
{
return 0;
}
#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
#endif /* !CONFIG_DYNAMIC_FTRACE */
#endif /* CONFIG_DYNAMIC_FTRACE && !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
/*
* Hook the return address and push it in the stack of return addrs

18
kernel/trace/fgraph.c
View File

@ -30,6 +30,24 @@ int ftrace_graph_active;
/* Both enabled by default (can be cleared by function_graph tracer flags */
static bool fgraph_sleep_time = true;
/*
* archs can override this function if they must do something
* to enable hook for graph tracer.
*/
int __weak ftrace_enable_ftrace_graph_caller(void)
{
return 0;
}
/*
* archs can override this function if they must do something
* to disable hook for graph tracer.
*/
int __weak ftrace_disable_ftrace_graph_caller(void)
{
return 0;
}
/**
* ftrace_graph_stop - set to permanently disable function graph tracing
*