Merge tag 'csky-for-linus-5.7-rc1' of git://github.com/c-sky/csky-linux

Pull csky updates from Guo Ren:

 - Add kproobes/uprobes support

 - Add lockdep, rseq, gcov support

 - Fixup init_fpu

 - Fixup ftrace_modify deadlock

 - Fixup speculative execution on IO area

* tag 'csky-for-linus-5.7-rc1' of git://github.com/c-sky/csky-linux:
  csky: Fixup cpu speculative execution to IO area
  csky: Add uprobes support
  csky: Add kprobes supported
  csky: Enable LOCKDEP_SUPPORT
  csky: Enable the gcov function
  csky: Fixup get wrong psr value from phyical reg
  csky/ftrace: Fixup ftrace_modify_code deadlock without CPU_HAS_ICACHE_INS
  csky: Implement ftrace with regs
  csky: Add support for restartable sequence
  csky: Implement ptrace regs and stack API
  csky: Fixup init_fpu compile warning with __init

1 files changed, 42 insertions, 0 deletions

diff --git a/arch/csky/kernel/ftrace.c b/arch/csky/kernel/ftrace.c
index 44f4880179b7..44628e3f7fa6 100644
--- a/arch/csky/kernel/ftrace.c
+++ b/arch/csky/kernel/ftrace.c
@@ -3,6 +3,7 @@
 
 #include <linux/ftrace.h>
 #include <linux/uaccess.h>
+#include <linux/stop_machine.h>
 #include <asm/cacheflush.h>
 
 #ifdef CONFIG_DYNAMIC_FTRACE
@@ -126,6 +127,9 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
 {
 	int ret = ftrace_modify_code((unsigned long)&ftrace_call,
 				(unsigned long)func, true, true);
+	if (!ret)
+		ret = ftrace_modify_code((unsigned long)&ftrace_regs_call,
+				(unsigned long)func, true, true);
 	return ret;
 }
 
@@ -135,6 +139,14 @@ int __init ftrace_dyn_arch_init(void)
 }
 #endif /* CONFIG_DYNAMIC_FTRACE */
 
+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
+int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
+		       unsigned long addr)
+{
+	return ftrace_modify_code(rec->ip, addr, true, true);
+}
+#endif
+
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
 			   unsigned long frame_pointer)
@@ -190,5 +202,35 @@ int ftrace_disable_ftrace_graph_caller(void)
 #endif /* CONFIG_DYNAMIC_FTRACE */
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 
+#ifndef CONFIG_CPU_HAS_ICACHE_INS
+struct ftrace_modify_param {
+	int command;
+	atomic_t cpu_count;
+};
+
+static int __ftrace_modify_code(void *data)
+{
+	struct ftrace_modify_param *param = data;
+
+	if (atomic_inc_return(&param->cpu_count) == 1) {
+		ftrace_modify_all_code(param->command);
+		atomic_inc(&param->cpu_count);
+	} else {
+		while (atomic_read(&param->cpu_count) <= num_online_cpus())
+			cpu_relax();
+		local_icache_inv_all(NULL);
+	}
+
+	return 0;
+}
+
+void arch_ftrace_update_code(int command)
+{
+	struct ftrace_modify_param param = { command, ATOMIC_INIT(0) };
+
+	stop_machine(__ftrace_modify_code, &param, cpu_online_mask);
+}
+#endif
+
 /* _mcount is defined in abi's mcount.S */
 EXPORT_SYMBOL(_mcount);