On Fri, Jan 20, 2023 at 10:13:04AM +0800, Li Lingfeng wrote: > Memory will be allocated to store substring_t in match_strdup(), which means > the caller of match_strdup() may need to be scheduled out to wait for reclaiming > memory. > > Using local array to store substring_t to remove the restriction. > > Link: https://lore.kernel.org/all/20221104023938.2346986-5-yukuai1@xxxxxxxxxxxxxxx/ > Signed-off-by: Li Lingfeng <lilingfeng3@xxxxxxxxxx> Acked-by: Tejun Heo <tj@xxxxxxxxxx> This fixes a sleep-while-atomic splat in blk-iocost, so it'd be a good idea to add: Fixes: 2c0647988433 ("blk-iocost: don't release 'ioc->lock' while updating params"). The mm tree likely is the best fit but given the splat the block tree can work too. Andrew, Jens, what do you think? Thanks. -- tejun
