>> Technically, I think the answer is yes, at least in C99 (and I suppose >> gcc would accept it in gnu89 mode as well). >> >> printk("%pg\n", &(struct flag_printer){.flags = my_flags, .names = >> vmaflags_names}); >> >> Not tested, and I still don't think it would be particularly readable >> even when macroized >> >> printk("%pg\n", PRINTF_VMAFLAGS(my_flags)); > i test on gcc 4.9.3, it can work for this method, > so the final solution like this: > printk.h: > struct flag_fmt_spec { > unsigned long flag; > struct trace_print_flags *flags; > int array_size; > char delimiter; } > > #define FLAG_FORMAT(flag, flag_array, delimiter) (&(struct flag_ft_spec){ > .flag = flag, .flags = flag_array, .array_size = ARRAY_SIZE(flag_array), > .delimiter = delimiter}) > #define VMA_FLAG_FORMAT(flag) FLAG_FORMAT(flag, vmaflags_names, ‘|’) a little change: #define VMA_FLAG_FORMAT(vma) FLAG_FORMAT(vma->vm_flags, vmaflags_names, ‘|’)
> source code: > printk("%pg\n", VMA_FLAG_FORMAT(my_flags)); a little change: printk("%pg\n", VMA_FLAG_FORMAT(vma)); > > that’s all, see cpumask_pr_args(masks) macro, > it also use macro and %*pb to print cpu mask . > i think this method is not very complex to use . > > search source code , > there is lots of printk to print flag into hex number : > $ grep -n -r 'printk.*flag.*%x’ . > it will be great if this flag string print is generic. > > Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/