linux-kernel - Re: [PATCH 5.10 000/657] 5.10.20-rc4 review

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Date:   Fri, 5 Mar 2021 09:52:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        open list <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, Jon Hunter <jonathanh@...dia.com>,
        linux-stable <stable@...r.kernel.org>,
        Pavel Machek <pavel@...x.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 5.10 000/657] 5.10.20-rc4 review

On Fri, Mar 05, 2021 at 01:39:46PM +0530, Naresh Kamboju wrote:
> On Fri, 5 Mar 2021 at 02:45, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > On Thu, Mar 4, 2021 at 9:56 AM Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> > >
> > > On Thu, 4 Mar 2021 at 01:34, Guenter Roeck <linux@...ck-us.net> wrote:
> > > >
> > > > Upstream has:
> > > >
> > > > e71a8d5cf4b4 tty: fix up iterate_tty_read() EOVERFLOW handling
> > > > ddc5fda74561 tty: fix up hung_up_tty_read() conversion
> > >
> > > I have applied these two patches and the reported problem did not solve.
> >
> > Hmm. Upstream has:
> >
> > *  3342ff2698e9 ("tty: protect tty_write from odd low-level tty disciplines")
> > *  a9cbbb80e3e7 ("tty: avoid using vfs_iocb_iter_write() for
> > redirected console writes")
> > *  17749851eb9c ("tty: fix up hung_up_tty_write() conversion")
> > G  e71a8d5cf4b4 ("tty: fix up iterate_tty_read() EOVERFLOW handling")
> > G  ddc5fda74561 ("tty: fix up hung_up_tty_read() conversion")
> >  * c7135bbe5af2 ("tty: fix up hung_up_tty_write() conversion")
> >   d7fe75cbc23c ("tty: teach the n_tty ICANON case about the new
> > "cookie continuations" too")
> >   15ea8ae8e03f ("tty: teach n_tty line discipline about the new
> > "cookie continuations"")
> >   64a69892afad ("tty: clean up legacy leftovers from n_tty line discipline")
> > *  9bb48c82aced ("tty: implement write_iter")
> > *  dd78b0c483e3 ("tty: implement read_iter")
> > *  3b830a9c34d5 ("tty: convert tty_ldisc_ops 'read()' function to take
> > a kernel pointer")
> >
> > Where those ones marked with '*' seem to be in v5.10.y, and the one
> > prefixed with 'G' are the ones Guenter mentioned.
> >
> > (We seem to have the "tty: fix up hung_up_tty_write() conversion"
> > commit twice. I'm not sure how that happened, but whatever).

I merged it through two different branches by applying it from email,
one for 5.10-final and one for 5.11-rc1, sorry about that.

> > But that still leaves three commits that don't seem to be in 5.10.y:
> >
> >   d7fe75cbc23c ("tty: teach the n_tty ICANON case about the new
> > "cookie continuations" too")
> >   15ea8ae8e03f ("tty: teach n_tty line discipline about the new
> > "cookie continuations"")
> >   64a69892afad ("tty: clean up legacy leftovers from n_tty line discipline")
> >
> > and they might fix what are otherwise short reads. Which is allowed by
> > POSIX, afaik, but ..
> >
> > Do those three commits fix your test-case?
> 
> Yes.
> As per your suggestion I've added these three patches and tested
> and the reported test case PASS now [1].
> 
> This means I have five extra patches on top of the stable v5.10.20 tag.
> 
> $ git log --oneline
> 8c1c1de499af tty: teach the n_tty ICANON case about the new "cookie
> continuations" too
> 02aada164879 tty: teach n_tty line discipline about the new "cookie
> continuations"
> fb0df6b17897 tty: clean up legacy leftovers from n_tty line discipline
> 429f7fc84d6a tty: fix up iterate_tty_read() EOVERFLOW handling
> d0d54bca80a8 tty: fix up hung_up_tty_read() conversion
> 83be32b6c9e5 (tag: v5.10.20, origin/linux-5.10.y) Linux 5.10.20

That last commit, "tty: fix up hung_up_tty_read() conversion" is already
in 5.10.20 as e018e57fd5c0 ("tty: fix up hung_up_tty_write()
conversion"), it came in at 5.10.11, so how did you apply it again?

Anyway, thanks for these, I've queued up the 4 other commits now to the
5.10.y and 5.11.y trees, let's see what happens...

greg k-h