linux-kernel - Re: [PATCH 03/58] serial_core: Un-ifdef sysrq SUPPORT

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Date:   Tue, 17 Dec 2019 14:48:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     linux-kernel@...r.kernel.org,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Jiri Slaby <jslaby@...e.com>,
        Vasiliy Khoruzhick <vasilykh@...sta.com>,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH 03/58] serial_core: Un-ifdef sysrq SUPPORT_SYSRQ

On Fri, Dec 13, 2019 at 12:06:02AM +0000, Dmitry Safonov wrote:
> The SUPPORT_SYSRQ is messy: every .c source should define it before
> including "serial_core.h" if sysrq is supported or struct uart_port will
> differ in sizes. Also this prevents moving to serial_core.c functions:
> uart_handle_sysrq_char(), uart_prepare_sysrq_char(),
> uart_unlock_and_check_sysrq().
> 
> It doesn't save many bytes in the structure, and a better way to reduce
> it's size would be making rs485 and iso7816 pointers.

Yes, the whole thing needs some work with the tool 'pahole' to fix it
up.

thanks,

greg k-h