linux-kernel - [PATCH v3 3/9] x86/unwind: Compile kretprobe fixup code only if CONFIG

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Message-Id: <163477768249.264901.5797532967197120056.stgit@devnote2>
Date:   Thu, 21 Oct 2021 09:54:42 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Ananth N Mavinakayanahalli <ananth@...ux.ibm.com>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        mhiramat@...nel.org, Sven Schnelle <svens@...ux.ibm.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 3/9] x86/unwind: Compile kretprobe fixup code only if CONFIG_KRETPROBES=y

Compile kretprobe related stacktrace entry recovery code and
unwind_state::kr_cur field only when CONFIG_KRETPROBES=y.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 arch/x86/include/asm/unwind.h |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/include/asm/unwind.h b/arch/x86/include/asm/unwind.h
index fca2e783e3ce..2a1f8734416d 100644
--- 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. */