Re: [PATCH] block: avoild hang when bio_list is non-NULL in submit_bio_wait()

[Christoph Hellwig]

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?