panic: restore variable arguments to nmi_panic()

nmi_panic() used to accept variable arguments until commit ebc41f20d77f
("panic: change nmi_panic from macro to function") flattened it to a final
message string.  vpanic() did not exist back then, so the function had to
format through panic("%s", msg).

Bring the variable arguments back and format with vpanic() directly. 
The next patch makes nmi_panic() try the panic_force_cpu= redirect
before claiming panic_cpu.  panic_try_force_cpu() needs to print the
message but it is used also by panic() which accepts variable argument
list.  The string could be formatted only when a CPU gets assigned to
process the redirection.  Otherwise, there might be a race when writing
to the `panic_force_buf`.

No current caller passes a string with format specifiers.  The closest one
is hpwdt_pretimeout(), which builds panic_msg with hex_byte_pack() and has
only two variants, both plain strings.  But the new __printf() annotation
on nmi_panic() would warn with -Wformat-security there because the buffer
is passed directly as the format argument, so switch it to nmi_panic(regs,
"%s", panic_msg).

[pmladek@suse.com: changelog fix]
	Link: https://lore.kernel.org/arJxFybmtD7OBIcL@pathway.suse.cz
Link: https://lore.kernel.org/20260916182957.7788-5-brads@mainlining.org
Signed-off-by: Bradley Morgan <brads@mainlining.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Suggested-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Guenetr Roeck <linux@roeck-us.net>
Cc: Sashiko <sashiko-bot@kernel.org>
Cc: Wang Jinchao <wangjinchao600@gmail.com>
Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: <stable@vger.kernel.org>

0 files changed, 0 insertions, 0 deletions