From: Masami Hiramatsu <mhiramat@kernel.org>
Date: Thu, 21 Oct 2021 09:54:42 +0900
Subject: x86/unwind: Compile kretprobe fixup code only if CONFIG_KRETPROBES=y
Patch-mainline: v5.16-rc1
Git-commit: 811b93ffaa488a4733270d8c8bc6c773334ab351
References: jsc#PED-1377
Compile kretprobe related stacktrace entry recovery code and
unwind_state::kr_cur field only when CONFIG_KRETPROBES=y.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
arch/x86/include/asm/unwind.h | 6 ++++++
1 file changed, 6 insertions(+)
--- a/arch/x86/include/asm/unwind.h
+++ b/arch/x86/include/asm/unwind.h
@@ -16,7 +16,9 @@ struct unwind_state {
unsigned long stack_mask;
struct task_struct *task;
int graph_idx;
+#ifdef CONFIG_KRETPROBES
struct llist_node *kr_cur;
+#endif
bool error;
#if defined(CONFIG_UNWINDER_ORC)
bool signal, full_regs;
@@ -105,9 +107,13 @@ static inline
unsigned long unwind_recover_kretprobe(struct unwind_state *state,
unsigned long addr, unsigned long *addr_p)
{
+#ifdef CONFIG_KRETPROBES
return is_kretprobe_trampoline(addr) ?
kretprobe_find_ret_addr(state->task, addr_p, &state->kr_cur) :
addr;
+#else
+ return addr;
+#endif
}
/* Recover the return address modified by kretprobe and ftrace_graph. */