From: Andy Shevchenko andriy.shevchenko@linux.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@linux.intel.com Reviewed-by: Kees Cook kees@kernel.org Reviewed-by: Petr Mladek pmladek@suse.com Link: https://lore.kernel.org/r/20250321144822.324050-4-andriy.shevchenko@linux.in... Signed-off-by: Petr Mladek pmladek@suse.com Signed-off-by: Sasha Levin sashal@kernel.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 1ef95c0287f05..a93ed5ac32265 100644 --- a/include/linux/trace_seq.h +++ b/include/linux/trace_seq.h @@ -88,8 +88,8 @@ 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); @@ -113,8 +113,8 @@ 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 ccadd8c657e1a..fd853bf0000d2 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3322,10 +3322,9 @@ 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 ring_buffer_event *event; int len = 0, size; @@ -3375,7 +3374,6 @@ __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) { @@ -3405,7 +3403,6 @@ 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, ...) { @@ -3450,7 +3447,6 @@ 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, ...) { @@ -3466,7 +3462,6 @@ 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(printk_trace, ip, fmt, args); diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index abe8169c3e879..ccf3874823f5f 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -837,13 +837,15 @@ 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);