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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2019-09-05 21:20:29 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-09-18 05:24:55 +0300 |
| commit | 370011a27028d6f05e598ed6211a0ca2dc0213f7 (patch) | |
| tree | 9795c67704e2d5d70595e4e61e5517393d40f644 /arch/powerpc/kernel/trace/ftrace_64_pg.S | |
| parent | a3db31ff6ce31f5a544a66b61613a098029031cc (diff) | |
| download | linux-370011a27028d6f05e598ed6211a0ca2dc0213f7.tar.xz | |
powerpc/ftrace: Enable HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
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
Diffstat (limited to 'arch/powerpc/kernel/trace/ftrace_64_pg.S')
| -rw-r--r-- | arch/powerpc/kernel/trace/ftrace_64_pg.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/trace/ftrace_64_pg.S b/arch/powerpc/kernel/trace/ftrace_64_pg.S index e41a7d13c99c..6708e24db0ab 100644 --- a/arch/powerpc/kernel/trace/ftrace_64_pg.S +++ b/arch/powerpc/kernel/trace/ftrace_64_pg.S @@ -41,6 +41,7 @@ _GLOBAL(ftrace_stub) #ifdef CONFIG_FUNCTION_GRAPH_TRACER _GLOBAL(ftrace_graph_caller) + addi r5, r1, 112 /* load r4 with local address */ ld r4, 128(r1) subi r4, r4, MCOUNT_INSN_SIZE |