mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-11 04:46:38 +07:00
arm64: function_graph: Simplify with function_graph_enter()
The function_graph_enter() function does the work of calling the function
graph hook function and the management of the shadow stack, simplifying the
work done in the architecture dependent prepare_ftrace_return().
Have arm64 use the new code, and remove the shadow stack management as well as
having to set up the trace structure.
This is needed to prepare for a fix of a design bug on how the curr_ret_stack
is used.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: stable@kernel.org
Fixes: 03274a3ffb
("tracing/fgraph: Adjust fgraph depth before calling trace return callback")
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
parent
f1f5b14afd
commit
01e0ab2c4f
@ -216,8 +216,6 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
|
||||
{
|
||||
unsigned long return_hooker = (unsigned long)&return_to_handler;
|
||||
unsigned long old;
|
||||
struct ftrace_graph_ent trace;
|
||||
int err;
|
||||
|
||||
if (unlikely(atomic_read(¤t->tracing_graph_pause)))
|
||||
return;
|
||||
@ -229,18 +227,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
|
||||
*/
|
||||
old = *parent;
|
||||
|
||||
trace.func = self_addr;
|
||||
trace.depth = current->curr_ret_stack + 1;
|
||||
|
||||
/* Only trace if the calling function expects to */
|
||||
if (!ftrace_graph_entry(&trace))
|
||||
return;
|
||||
|
||||
err = ftrace_push_return_trace(old, self_addr, &trace.depth,
|
||||
frame_pointer, NULL);
|
||||
if (err == -EBUSY)
|
||||
return;
|
||||
else
|
||||
if (!function_graph_enter(old, self_addr, frame_pointer, NULL))
|
||||
*parent = return_hooker;
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user