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See http://www.infradead.org/rpr.html On Mon, Mar 02, 2026 at 10:23:04PM +0800, Gao Xiang wrote: > > > I've trimmed down the call stack, as follows: > > > > > > f2fs_submit_read_io > > > submit_bio > > > mmc_blk_mq_recovery > > > z_erofs_endio > > > vm_map_ram > > > > ->bi_end_io code really should not be having random in_atomic() > > checks that make it completely different, but even if they have > > Thanks for the head-up. > > For this part, I'm pretty sure we need this particular one > otherwise the scheduling performance (latency sensitive) > is unacceptable for all Android phone users. Where do you regularly get user context calls to ->bi_end_io?