Re: [PATCH 2/3] writeback: Add tracing to balance_dirty_pages

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> +
> +	TP_fast_assign(
> +		char *__no_bdi = "(no bdi)";
> +
> +		if (bdi)
> +			strncpy(__entry->name, dev_name(bdi->dev), 32);
> +		else
> +			strncpy(__entry->name, __no_bdi, 32);

I can't see a caller that doesn't have a bdi.

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