linux-kernel - Re: [PATCH v3] serial: make uart_console_write->putchar()'s character an unsigned char

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Date:   Thu, 3 Mar 2022 12:35:58 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     "Maciej W. Rozycki" <macro@...am.me.uk>,
        Paul Cercueil <paul@...pouillou.net>
Cc:     David Laight <David.Laight@...LAB.COM>,
        'Uwe Kleine-König' 
        <u.kleine-koenig@...gutronix.de>, gregkh@...uxfoundation.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Mateusz Holenko <mholenko@...micro.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Liviu Dudau <liviu.dudau@....com>,
        Baruch Siach <baruch@...s.co.il>, linux-kernel@...r.kernel.org,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Simek <michal.simek@...inx.com>,
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        Fabio Estevam <festevam@...il.com>,
        Russell King <linux@...linux.org.uk>,
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        Andy Gross <agross@...nel.org>,
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        NXP Linux Team <linux-imx@....com>,
        linux-serial@...r.kernel.org, Vineet Gupta <vgupta@...nel.org>,
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        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        "David S. Miller" <davem@...emloft.net>,
        Taichi Sugaya <sugaya.taichi@...ionext.com>,
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        Pengutronix Kernel Team <kernel@...gutronix.de>,
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        Baolin Wang <baolin.wang7@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Andreas Färber <afaerber@...e.de>
Subject: Re: [PATCH v3] serial: make uart_console_write->putchar()'s character
 an unsigned char

On 03. 03. 22, 12:30, Maciej W. Rozycki wrote:
>   It does, but, oh dear, it's a "solution" to a problem we have created in
> the first place.  Why do we ever want to have signed characters in the TTY
> layer,

We don't. We use char, which is signed or unsigned, depending on arch. 
After all, this is text coming from printk layer, i.e. char * by 
convention coming from the standard.

thanks,
-- 
js
suse labs