From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/arch/riscv/kernel/ftrace.c | 14 ++++++++++++--
1 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/kernel/arch/riscv/kernel/ftrace.c b/kernel/arch/riscv/kernel/ftrace.c
index 765b624..8693dfc 100644
--- a/kernel/arch/riscv/kernel/ftrace.c
+++ b/kernel/arch/riscv/kernel/ftrace.c
@@ -15,11 +15,21 @@
int ftrace_arch_code_modify_prepare(void) __acquires(&text_mutex)
{
mutex_lock(&text_mutex);
+
+ /*
+ * The code sequences we use for ftrace can't be patched while the
+ * kernel is running, so we need to use stop_machine() to modify them
+ * for now. This doesn't play nice with text_mutex, we use this flag
+ * to elide the check.
+ */
+ riscv_patch_in_stop_machine = true;
+
return 0;
}
int ftrace_arch_code_modify_post_process(void) __releases(&text_mutex)
{
+ riscv_patch_in_stop_machine = false;
mutex_unlock(&text_mutex);
return 0;
}
@@ -109,9 +119,9 @@
{
int out;
- ftrace_arch_code_modify_prepare();
+ mutex_lock(&text_mutex);
out = ftrace_make_nop(mod, rec, MCOUNT_ADDR);
- ftrace_arch_code_modify_post_process();
+ mutex_unlock(&text_mutex);
return out;
}
--
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