Re: [PATCH 34/33] netfs: Use in_interrupt() not in_softirq()

[Sebastian Andrzej Siewior]

On 2021-02-16 09:42:30 [+0100], Christoph Hellwig wrote:
> On Mon, Feb 15, 2021 at 10:46:23PM +0000, David Howells wrote:
> > The in_softirq() in netfs_rreq_terminated() works fine for the cache being
> > on a normal disk, as the completion handlers may get called in softirq
> > context, but for an NVMe drive, the completion handler may get called in
> > IRQ context.
> > 
> > Fix to use in_interrupt() instead of in_softirq() throughout the read
> > helpers, particularly when deciding whether to punt code that might sleep
> > off to a worker thread.
> 
> We must not use either check, as they all are unreliable especially
> for PREEMPT-RT.

Yes, please. I try to cleanup the users one by one
    https://lore.kernel.org/r/20200914204209.256266093@xxxxxxxxxxxxx/
    https://lore.kernel.org/amd-gfx/20210209124439.408140-1-bigeasy@xxxxxxxxxxxxx/

Sebastian