linux-kernel - Re: [PATCH] kernel/printk: add kmsg SEEK

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Message-ID: <20200313104445.GH13406@glitch>
Date:   Fri, 13 Mar 2020 07:44:45 -0300
From:   Bruno Meneguele <bmeneg@...hat.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        pmladek@...e.com, sergey.senozhatsky@...il.com, rostedt@...dmis.org
Subject: Re: [PATCH] kernel/printk: add kmsg SEEK_CUR handling

On Fri, Mar 13, 2020 at 08:22:54AM +0100, Greg KH wrote:
> On Thu, Mar 12, 2020 at 09:35:33PM -0300, Bruno Meneguele wrote:
> > Userspace libraries, e.g. glibc's dprintf(), expect the default return value
> > for invalid seek situations: -ESPIPE, but when the IO was over /dev/kmsg the
> > current state of kernel code was returning the generic case of an -EINVAL.
> > Hence, userspace programs were not behaving as expected or documented.
> > 
> > With this patch we add SEEK_CUR case returning the expected value and also a
> > simple mention of it in kernel's documentation for those relying on that for
> > guidance.
> > 
> > Signed-off-by: Bruno Meneguele <bmeneg@...hat.com>
> > ---
> >  Documentation/ABI/testing/dev-kmsg | 2 ++
> >  kernel/printk/printk.c             | 4 ++++
> >  2 files changed, 6 insertions(+)
> 
> <formletter>
> 
> This is not the correct way to submit patches for inclusion in the
> stable kernel tree.  Please read:
>     https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
> for how to do this properly.
> 
> </formletter>
> 

ouch, yes of course. Sorry for the noise.  
Will repost it once the concerns with the patch are solved.

Thanks Greg.

-- 
bmeneg 
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