linux-kernel - Re: [PATCH 0/3] minitty: a minimal TTY layer alternative for embedded systems

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Message-ID: <alpine.LFD.2.20.1703240816380.2304@knanqh.ubzr>
Date:   Fri, 24 Mar 2017 08:18:39 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Baruch Siach <baruch@...s.co.il>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] minitty: a minimal TTY layer alternative for embedded
 systems

On Fri, 24 Mar 2017, Baruch Siach wrote:

> Hi Nicolas,
> 
> On Thu, Mar 23, 2017 at 05:03:01PM -0400, Nicolas Pitre wrote:
> > Here's some numbers using a minimal ARM config.
> > 
> > When CONFIG_TTY=y, the following files are linked into the kernel:
> > 
> >    text    data     bss     dec     hex filename
> >    8796     128       0    8924    22dc drivers/tty/n_tty.o
> >   12846     276      44   13166    336e drivers/tty/serial/serial_core.o
> >    4852     489      49    5390    150e drivers/tty/sysrq.o
> >    1376       0       0    1376     560 drivers/tty/tty_buffer.o
> >   13571     172     132   13875    3633 drivers/tty/tty_io.o
> >    3072       0       0    3072     c00 drivers/tty/tty_ioctl.o
> >    2457       2     120    2579     a13 drivers/tty/tty_ldisc.o
> >    1328       0       0    1328     530 drivers/tty/tty_ldsem.o
> >     316       0       0     316     13c drivers/tty/tty_mutex.o
> >    2516       0       0    2516     9d4 drivers/tty/tty_port.o
> >   51130    1067     345   52542    cd3e (TOTALS)
> > 
> > With CONFIG_TTY=n and CONFIG_MINITTY_SERIAL=y, the above is replaced by:
> > 
> >    text    data     bss     dec     hex filename
> >    8776       8     108    8892    22bc drivers/tty/serial/minitty_serial.o
> 
> tty_baudrate.o is missing here. It is included in serial_core.o when 
> CONFIG_TTY=y.

It is also included when CONFIG_MINITTY_SERIAL=y, so for comparison 
purpose I didn't list common files here.


Nicolas