add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/perf/builtin-trace.c
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..
@@ -87,6 +87,8 @@
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 # define F_LINUX_SPECIFIC_BASE	1024
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 #endif
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+#define RAW_SYSCALL_ARGS_NUM	6
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+
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 /*
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  * strtoul: Go from a string to a value, i.e. for msr: MSR_FS_BASE to 0xc0000100
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  */
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@@ -107,7 +109,7 @@
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 		const char *sys_enter,
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 			   *sys_exit;
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 	}	   bpf_prog_name;
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-	struct syscall_arg_fmt arg[6];
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+	struct syscall_arg_fmt arg[RAW_SYSCALL_ARGS_NUM];
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 	u8	   nr_args;
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 	bool	   errpid;
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 	bool	   timeout;
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@@ -1216,7 +1218,7 @@
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  */
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 struct bpf_map_syscall_entry {
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 	bool	enabled;
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-	u16	string_args_len[6];
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+	u16	string_args_len[RAW_SYSCALL_ARGS_NUM];
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 };
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 /*
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@@ -1641,7 +1643,7 @@
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 {
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 	int idx;
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-	if (nr_args == 6 && sc->fmt && sc->fmt->nr_args != 0)
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+	if (nr_args == RAW_SYSCALL_ARGS_NUM && sc->fmt && sc->fmt->nr_args != 0)
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 		nr_args = sc->fmt->nr_args;
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 	sc->arg_fmt = calloc(nr_args, sizeof(*sc->arg_fmt));
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@@ -1774,11 +1776,11 @@
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 #endif
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 	sc = trace->syscalls.table + id;
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 	if (sc->nonexistent)
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-		return 0;
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+		return -EEXIST;
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 	if (name == NULL) {
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 		sc->nonexistent = true;
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-		return 0;
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+		return -EEXIST;
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 	}
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 	sc->name = name;
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@@ -1792,11 +1794,18 @@
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 		sc->tp_format = trace_event__tp_format("syscalls", tp_name);
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 	}
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-	if (syscall__alloc_arg_fmts(sc, IS_ERR(sc->tp_format) ? 6 : sc->tp_format->format.nr_fields))
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-		return -ENOMEM;
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-
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-	if (IS_ERR(sc->tp_format))
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+	/*
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+	 * Fails to read trace point format via sysfs node, so the trace point
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+	 * doesn't exist.  Set the 'nonexistent' flag as true.
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+	 */
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+	if (IS_ERR(sc->tp_format)) {
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+		sc->nonexistent = true;
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 		return PTR_ERR(sc->tp_format);
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+	}
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+
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+	if (syscall__alloc_arg_fmts(sc, IS_ERR(sc->tp_format) ?
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+					RAW_SYSCALL_ARGS_NUM : sc->tp_format->format.nr_fields))
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+		return -ENOMEM;
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 	sc->args = sc->tp_format->format.fields;
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 	/*
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@@ -2114,11 +2123,8 @@
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 	    (err = trace__read_syscall_info(trace, id)) != 0)
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 		goto out_cant_read;
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-	if (trace->syscalls.table[id].name == NULL) {
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-		if (trace->syscalls.table[id].nonexistent)
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-			return NULL;
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+	if (trace->syscalls.table && trace->syscalls.table[id].nonexistent)
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 		goto out_cant_read;
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-	}
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 	return &trace->syscalls.table[id];
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