linux-kernel - Re: problems with splice from /proc (was Linux 5.10-rc1)

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Date:   Tue, 27 Oct 2020 09:14:20 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: problems with splice from /proc (was Linux 5.10-rc1)

On Tue, Oct 27, 2020 at 08:07:45AM +0000, Christoph Hellwig wrote:
> On Tue, Oct 27, 2020 at 08:55:41AM +0100, Greg KH wrote:
> > This is just a test, part of the bionic test suite to verify that bionic
> > is working properly, and is run on new kernels as a verification that
> > nothing functional broke in the kernel update.
> > 
> > I don't know about "real applications" yet.
> > 
> > Do you have to implement this on a per-proc-file-basis, or will it work
> > for the whole filesystem?
> > 
> > And are the patches public anywhere that I could test them out?
> 
> This all branch has the last posted version:
> 
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/set_fs-rw.2
> 
> with tthe proc:, sysctl: and seq_file: patches related to it.  It did
> switch over all seq_file instances, but non-seq_file instances and write
> operations will need manual per-instance work.

Luckily /proc/cpuinfo seems to use the seq_file interface, so this
series would work for that.

What's the odds of this series getting into 5.10-final?  I'll go run it
through the Android build system right now to see if it fixes the issue
or not...

thanks,

greg k-h