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powerpc/ftrace: Enable HAVE_FUNCTION_GRAPH_RET_ADDR_PTR

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This associates entries in the ftrace_ret_stack with corresponding stack
frames, enabling more robust stack unwinding. Also update the only user
of ftrace_graph_ret_addr() to pass the stack pointer.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/0224f2d0971b069c678e2ff678cfc2cd1e114cfe.1567707399.git.naveen.n.rao@linux.vnet.ibm.com
This commit is contained in:
Naveen N. Rao
2019-09-05 23:50:29 +05:30
committed by Michael Ellerman
parent a3db31ff6c
commit 370011a270
7 changed files with 11 additions and 4 deletions
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5
arch/powerpc/kernel/trace/ftrace.c
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@@ -944,7 +944,8 @@ int ftrace_disable_ftrace_graph_caller(void)
* Hook the return address and push it in the stack of return addrs
* in current thread info. Return the address we want to divert to.
*/
unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip)
unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
unsigned long sp)
{
unsigned long return_hooker;
@@ -956,7 +957,7 @@ unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip)
return_hooker = ppc_function_entry(return_to_handler);
if (!function_graph_enter(parent, ip, 0, NULL))
if (!function_graph_enter(parent, ip, 0, (unsigned long *)sp))
parent = return_hooker;
out:
return parent;