linux-kernel - Re: [PATCH v1 1/1] tty: Drop duplicate NULL check in TTY port functions

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Message-ID: <Yf07R9xdUtmcHU7m@kroah.com>
Date:   Fri, 4 Feb 2022 15:42:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Jiri Slaby <jirislaby@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] tty: Drop duplicate NULL check in TTY port
 functions

On Thu, Feb 03, 2022 at 12:40:00PM +0200, Andy Shevchenko wrote:
> On Thu, Feb 03, 2022 at 09:36:55AM +0100, Jiri Slaby wrote:
> > On 02. 02. 22, 17:57, Andy Shevchenko wrote:
> > > The free_page(addr), which becomes free_pages(addr, 0) checks addr against 0.
> > > No need to repeat this check in the callers, i.e.  tty_port_free_xmit_buf()
> > > and tty_port_destructor().
> > > 
> > > Note, INIT_KFIFO() is safe without that check, because it's aware of kfifo PTR
> > > versus embedded kfifo.
> > 
> > Not sure what you mean here ^^^? But it might be one of the morning brain
> > parser errors.
> 
> Or maybe my evening weren't working...
> 
> Actually INIT_KFIFO() can be outside of that check from day 1 because it
> operates on a separate member and does not rely on the FIFO itself to be
> allocated.
> 
> I tried to explain that, while kfifo allocation goes together with buffer,
> there is no dependency to any of those allocations.

Can you rewrite the changelog to say this?

thanks,

greg k-h