On Tue, Jul 06, 2021 at 05:30:54PM +0200, Abd-Alrhman Masalkhi wrote: > Thank you for your comment, the div_u64 function is called 5 times > inside diskstats_show function, so I have made a test case; I have > replaced one call with a constant number then I have compiled the > kernel, the result was instead of emitting "the frame size of 1656 > bytes is larger than 1280 bytes" warning, it has emitted "the frame > size of 1328 bytes is larger than 1280 bytes" warning, so I came to the > conclusion that each call to div_u64 will add 328 bytes to the stack > frame of diskstats_show function, since it is an inlined function. so I > thought it might be the solution that to preventing div_u64 to be > inlined in diskstats_show function. Adding a bunch of relevant parties to the CC list - any idea how we can make the generic do_div / div_u64 not use up such gigantic amounts of stack?
