linux-kernel - Re: [PATCH 34/33] netfs: Use in_interrupt() not in

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Message-ID: <20210216093044.GA24615@lst.de>
Date:   Tue, 16 Feb 2021 10:30:44 +0100
From:   Christoph Hellwig <hch@....de>
To:     David Howells <dhowells@...hat.com>
Cc:     Christoph Hellwig <hch@....de>,
        Trond Myklebust <trondmy@...merspace.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
        Jeff Layton <jlayton@...hat.com>,
        Matthew Wilcox <willy@...radead.org>, linux-cachefs@...hat.com,
        Alexander Viro <viro@...iv.linux.org.uk>, linux-mm@...ck.org,
        linux-afs@...ts.infradead.org,
        v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
        Jeff Layton <jlayton@...nel.org>,
        David Wysochanski <dwysocha@...hat.com>,
        linux-kernel@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH 34/33] netfs: Use in_interrupt() not in_softirq()

On Tue, Feb 16, 2021 at 09:29:31AM +0000, David Howells wrote:
> Is there a better way to do it?  The intent is to process the assessment phase
> in the calling thread's context if possible rather than bumping over to a
> worker thread.  For synchronous I/O, for example, that's done in the caller's
> thread.  Maybe that's the answer - if it's known to be asynchronous, I have to
> punt, but otherwise don't have to.

Yes, i think you want an explicit flag instead.