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bug: Hush suggest-attribute=format for __warn_printf() 

Recent additions to this function cause GCC 14.3.0 to get excited
(W=1) and suggest a missing attribute:

	lib/bug.c: In function '__warn_printf':
	lib/bug.c:187:25: error: function '__warn_printf' be a candidate for 'gnu_printf' format attribute [-Werror=suggest-attribute=format]
	  187 |                         vprintk(fmt, *args);
	      |                         ^~~~~~~

Disable the diagnostic locally, following the pattern used for stuff
like va_format().

Fixes: 5c47b7f3d1 ("bug: Add BUG_FORMAT_ARGS infrastructure")
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://patch.msgid.link/20251207-warn-printf-gcc-v1-1-b597d612b94b@google.com
master
Brendan Jackman 2025-12-07 03:53:18 +00:00 committed by Ingo Molnar
parent b5e51ef787
commit d36067d6ea
1 changed files with 4 additions and 0 deletions
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4
lib/bug.c
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@ -173,6 +173,9 @@ struct bug_entry *find_bug(unsigned long bugaddr)
return module_find_bug(bugaddr);
}
__diag_push();
__diag_ignore(GCC, all, "-Wsuggest-attribute=format",
"Not a valid __printf() conversion candidate.");
static void __warn_printf(const char *fmt, struct pt_regs *regs)
{
if (!fmt)
@ -192,6 +195,7 @@ static void __warn_printf(const char *fmt, struct pt_regs *regs)
printk("%s", fmt);
}
__diag_pop();
static enum bug_trap_type __report_bug(struct bug_entry *bug, unsigned long bugaddr, struct pt_regs *regs)
{