docs: printk-formats: Treat char as always unsigned

The Linux kernel switched to have char be equivalent to usigned char.
Reflect this in the printk specifiers.

Fixes: 3bc753c06dd0 ("kbuild: treat char as always unsigned")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230703145839.14248-2-andriy.shevchenko@linux.intel.com

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index 956c87b..0eed8a2 100644 (file)
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -15,8 +15,9 @@ Integer types
 
        If variable is of Type,         use printk format specifier:
        ------------------------------------------------------------
-               char                    %d or %hhx
+               signed char             %d or %hhx
                unsigned char           %u or %x
+               char                    %u or %x
                short int               %d or %hx
                unsigned short int      %u or %x
                int                     %d or %x