sh: ftrace: Fix up syscall tracepoint support. (99222622) · Commits · 戴 / test

arch/sh/kernel/ftrace.c

+27 −10

Original line number	Diff line number	Diff line
		@@ -291,31 +291,48 @@ struct syscall_metadata *syscall_nr_to_meta(int nr)
		return syscalls_metadata[nr];
		}

		void arch_init_ftrace_syscalls(void)
		int syscall_name_to_nr(char *name)
		{
		int i;

		if (!syscalls_metadata)
		return -1;
		for (i = 0; i < NR_syscalls; i++)
		if (syscalls_metadata[i])
		if (!strcmp(syscalls_metadata[i]->name, name))
		return i;
		return -1;
		}

		void set_syscall_enter_id(int num, int id)
		{
		syscalls_metadata[num]->enter_id = id;
		}

		void set_syscall_exit_id(int num, int id)
		{
		syscalls_metadata[num]->exit_id = id;
		}

		static int __init arch_init_ftrace_syscalls(void)
		{
		int i;
		struct syscall_metadata *meta;
		unsigned long **psys_syscall_table = &sys_call_table;
		static atomic_t refs;

		if (atomic_inc_return(&refs) != 1)
		goto end;

		syscalls_metadata = kzalloc(sizeof(syscalls_metadata)
		FTRACE_SYSCALL_MAX, GFP_KERNEL);
		if (!syscalls_metadata) {
		WARN_ON(1);
		return;
		return -ENOMEM;
		}

		for (i = 0; i < FTRACE_SYSCALL_MAX; i++) {
		meta = find_syscall_meta(psys_syscall_table[i]);
		syscalls_metadata[i] = meta;
		}
		return;

		/* Paranoid: avoid overflow */
		end:
		atomic_dec(&refs);
		return 0;
		}
		arch_initcall(arch_init_ftrace_syscalls);
		#endif /* CONFIG_FTRACE_SYSCALLS */