On Fri, 21 Jun 2024 16:42:38 +0200 Jan Kara <jack@xxxxxxx> wrote: > The dirty throttling logic is interspersed with assumptions that dirty > limits in PAGE_SIZE units fit into 32-bit (so that various > multiplications fit into 64-bits). If limits end up being larger, we > will hit overflows, possible divisions by 0 etc. Fix these problems by > never allowing so large dirty limits as they have dubious practical > value anyway. For dirty_bytes / dirty_background_bytes interfaces we can > just refuse to set so large limits. For dirty_ratio / > dirty_background_ratio it isn't so simple as the dirty limit is computed > from the amount of available memory which can change due to memory > hotplug etc. So when converting dirty limits from ratios to numbers of > pages, we just don't allow the result to exceed UINT_MAX. > Shouldn't this also be cc:stable?
