linux-kernel - Re: [PATCH] sh: Avoid using IRQ0 on SH3 and SH4

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Message-ID: <4ceea93f7f3ae45d5d14819cf678e34350c60334.camel@physik.fu-berlin.de>
Date:   Wed, 12 Jul 2023 17:51:24 +0200
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Guenter Roeck <linux@...ck-us.net>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        David Laight <David.Laight@...LAB.COM>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sh: Avoid using IRQ0 on SH3 and SH4

Hi!

On Wed, 2023-07-12 at 08:38 -0700, Guenter Roeck wrote:
> > 
> >     Not only x86, IIRC.
> >     Have you seen the commit below?
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ce753ad1549cbe9ccaea4c06a1f5fa47432c8289
> > 
> 
> Quoting:
> 
> using IRQ0 is considered invalid (according to Linus) outside the arch/ code
>                                                        ^^^^^^^^^^^^^^^^^^^^^^
> 
> The changes here were made _in_ the arch code. While there may be valid
> arguments for doing that, quoting the above commit as reason isn't really
> sufficient.

Well, the changes we made inside arch/sh were necessary to achieve the desired
effects in the code in drivers such as the SM501 controller or the SH companion
chips.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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