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Message-Id: <20250505225634.2688578-12-sashal@kernel.org>
Date: Mon, 5 May 2025 18:51:52 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Kees Cook <kees@...nel.org>,
Petr Mladek <pmladek@...e.com>,
Sasha Levin <sashal@...nel.org>,
rostedt@...dmis.org,
mhiramat@...nel.org,
linux-trace-kernel@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 012/294] tracing: Mark binary printing functions with __printf() attribute
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
[ Upstream commit 196a062641fe68d9bfe0ad36b6cd7628c99ad22c ]
Binary printing functions are using printf() type of format, and compiler
is not happy about them as is:
kernel/trace/trace.c:3292:9: error: function ‘trace_vbprintk’ might be a candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]
kernel/trace/trace_seq.c:182:9: error: function ‘trace_seq_bprintf’ might be a candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]
Fix the compilation errors by adding __printf() attribute.
While at it, move existing __printf() attributes from the implementations
to the declarations. IT also fixes incorrect attribute parameters that are
used for trace_array_printk().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Kees Cook <kees@...nel.org>
Reviewed-by: Petr Mladek <pmladek@...e.com>
Link: https://lore.kernel.org/r/20250321144822.324050-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Petr Mladek <pmladek@...e.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
include/linux/trace.h | 4 ++--
include/linux/trace_seq.h | 8 ++++----
kernel/trace/trace.c | 11 +++--------
kernel/trace/trace.h | 16 +++++++++-------
4 files changed, 18 insertions(+), 21 deletions(-)
diff --git a/include/linux/trace.h b/include/linux/trace.h
index fdcd76b7be83d..7eaad857dee04 100644
--- a/include/linux/trace.h
+++ b/include/linux/trace.h
@@ -72,8 +72,8 @@ static inline int unregister_ftrace_export(struct trace_export *export)
static inline void trace_printk_init_buffers(void)
{
}
-static inline int trace_array_printk(struct trace_array *tr, unsigned long ip,
- const char *fmt, ...)
+static inline __printf(3, 4)
+int trace_array_printk(struct trace_array *tr, unsigned long ip, const char *fmt, ...)
{
return 0;
}
diff --git a/include/linux/trace_seq.h b/include/linux/trace_seq.h
index 3691e0e76a1a2..62147eecf931d 100644
--- a/include/linux/trace_seq.h
+++ b/include/linux/trace_seq.h
@@ -79,8 +79,8 @@ extern __printf(2, 3)
void trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
extern __printf(2, 0)
void trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args);
-extern void
-trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
+extern __printf(2, 0)
+void trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
extern int trace_print_seq(struct seq_file *m, struct trace_seq *s);
extern int trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
int cnt);
@@ -104,8 +104,8 @@ static inline __printf(2, 3)
void trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
{
}
-static inline void
-trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
+static inline __printf(2, 0)
+void trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
{
}
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a41c99350a5bf..60c3f8352ddcf 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3487,10 +3487,9 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
}
EXPORT_SYMBOL_GPL(trace_vbprintk);
-__printf(3, 0)
-static int
-__trace_array_vprintk(struct trace_buffer *buffer,
- unsigned long ip, const char *fmt, va_list args)
+static __printf(3, 0)
+int __trace_array_vprintk(struct trace_buffer *buffer,
+ unsigned long ip, const char *fmt, va_list args)
{
struct trace_event_call *call = &event_print;
struct ring_buffer_event *event;
@@ -3543,7 +3542,6 @@ __trace_array_vprintk(struct trace_buffer *buffer,
return len;
}
-__printf(3, 0)
int trace_array_vprintk(struct trace_array *tr,
unsigned long ip, const char *fmt, va_list args)
{
@@ -3573,7 +3571,6 @@ int trace_array_vprintk(struct trace_array *tr,
* Note, trace_array_init_printk() must be called on @tr before this
* can be used.
*/
-__printf(3, 0)
int trace_array_printk(struct trace_array *tr,
unsigned long ip, const char *fmt, ...)
{
@@ -3618,7 +3615,6 @@ int trace_array_init_printk(struct trace_array *tr)
}
EXPORT_SYMBOL_GPL(trace_array_init_printk);
-__printf(3, 4)
int trace_array_printk_buf(struct trace_buffer *buffer,
unsigned long ip, const char *fmt, ...)
{
@@ -3634,7 +3630,6 @@ int trace_array_printk_buf(struct trace_buffer *buffer,
return ret;
}
-__printf(2, 0)
int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
{
return trace_array_vprintk(&global_trace, ip, fmt, args);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index db0d2641125e7..faf892aecdf49 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -800,13 +800,15 @@ static inline void __init disable_tracing_selftest(const char *reason)
extern void *head_page(struct trace_array_cpu *data);
extern unsigned long long ns2usecs(u64 nsec);
-extern int
-trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
-extern int
-trace_vprintk(unsigned long ip, const char *fmt, va_list args);
-extern int
-trace_array_vprintk(struct trace_array *tr,
- unsigned long ip, const char *fmt, va_list args);
+
+__printf(2, 0)
+int trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
+__printf(2, 0)
+int trace_vprintk(unsigned long ip, const char *fmt, va_list args);
+__printf(3, 0)
+int trace_array_vprintk(struct trace_array *tr,
+ unsigned long ip, const char *fmt, va_list args);
+__printf(3, 4)
int trace_array_printk_buf(struct trace_buffer *buffer,
unsigned long ip, const char *fmt, ...);
void trace_printk_seq(struct trace_seq *s);
--
2.39.5
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