linux-kernel - Re: [PATCH 02/10] tty: sysrq: switch sysrq handlers from int to u8

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Date:   Thu, 13 Jul 2023 10:45:50 +0800
From:   WANG Xuerui <kernel@...0n.name>
To:     "Jiri Slaby (SUSE)" <jirislaby@...nel.org>,
        gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        "David S. Miller" <davem@...emloft.net>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Josh Triplett <josh@...htriplett.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Zqiang <qiang.zhang1211@...il.com>
Subject: Re: [PATCH 02/10] tty: sysrq: switch sysrq handlers from int to u8

On 2023/7/12 16:18, Jiri Slaby (SUSE) wrote:
> The passed parameter to sysrq handlers is a key (a character). So change
> the type from 'int' to 'u8'. Let it specifically be 'u8' for two
> reasons:
> * unsigned: unsigned values come from the upper layers (devices) and the
>    tty layer assumes unsigned on most places, and
> * 8-bit: as that what's supposed to be one day in all the layers built
>    on the top of tty. (Currently, we use mostly 'unsigned char' and
>    somewhere still only 'char'. (But that also translates to the former
>    thanks to -funsigned-char.))
> 
> Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
> Cc: Richard Henderson <richard.henderson@...aro.org>
> Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
> Cc: Matt Turner <mattst88@...il.com>
> Cc: Huacai Chen <chenhuacai@...nel.org>
> Cc: WANG Xuerui <kernel@...0n.name>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: Christophe Leroy <christophe.leroy@...roup.eu>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> Cc: Maxime Ripard <mripard@...nel.org>
> Cc: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Jason Wessel <jason.wessel@...driver.com>
> Cc: Daniel Thompson <daniel.thompson@...aro.org>
> Cc: Douglas Anderson <dianders@...omium.org>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Len Brown <len.brown@...el.com>
> Cc: Pavel Machek <pavel@....cz>
> Cc: "Paul E. McKenney" <paulmck@...nel.org>
> Cc: Frederic Weisbecker <frederic@...nel.org>
> Cc: Neeraj Upadhyay <quic_neeraju@...cinc.com>
> Cc: Joel Fernandes <joel@...lfernandes.org>
> Cc: Josh Triplett <josh@...htriplett.org>
> Cc: Boqun Feng <boqun.feng@...il.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> Cc: Lai Jiangshan <jiangshanlai@...il.com>
> Cc: Zqiang <qiang.zhang1211@...il.com>
> ---
>   arch/alpha/kernel/setup.c       |  2 +-
>   arch/loongarch/kernel/sysrq.c   |  2 +-
>   arch/mips/kernel/sysrq.c        |  2 +-
>   arch/powerpc/xmon/xmon.c        |  2 +-
>   arch/sparc/kernel/process_64.c  |  4 ++--
>   drivers/gpu/drm/drm_fb_helper.c |  2 +-
>   drivers/tty/sysrq.c             | 40 ++++++++++++++++-----------------
>   include/linux/sysrq.h           |  2 +-
>   kernel/debug/debug_core.c       |  2 +-
>   kernel/power/poweroff.c         |  2 +-
>   kernel/rcu/tree_stall.h         |  2 +-
>   11 files changed, 31 insertions(+), 31 deletions(-)
> 
> [snip]
> diff --git a/arch/loongarch/kernel/sysrq.c b/arch/loongarch/kernel/sysrq.c
> index 366baef72d29..e663c10fa39c 100644
> --- a/arch/loongarch/kernel/sysrq.c
> +++ b/arch/loongarch/kernel/sysrq.c
> @@ -43,7 +43,7 @@ static void sysrq_tlbdump_othercpus(struct work_struct *dummy)
>   static DECLARE_WORK(sysrq_tlbdump, sysrq_tlbdump_othercpus);
>   #endif
>   
> -static void sysrq_handle_tlbdump(int key)
> +static void sysrq_handle_tlbdump(u8 key)
>   {
>   	sysrq_tlbdump_single(NULL);
>   #ifdef CONFIG_SMP
> [snip]

Acked-by: WANG Xuerui <git@...0n.name> # loongarch

Thanks!

-- 
WANG "xen0n" Xuerui

Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/