linux-kernel - Re: [PATCH] sh: avoid using IRQ0 on SH3/4

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Date:   Fri, 11 Feb 2022 21:30:31 +0100
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Sergey Shtylyov <s.shtylyov@....ru>, Rich Felker <dalias@...c.org>,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: [PATCH] sh: avoid using IRQ0 on SH3/4

Hi Sergey!

On 2/11/22 21:28, Sergey Shtylyov wrote:
> On 2/11/22 11:15 PM, Sergey Shtylyov wrote:
> 
>> Using IRQ0 by the platform devices is going to be disallowed soon (see [1])
>> and the code supporting SH3/4 SoCs maps the IRQ #s starting at 0 -- modify
>> that code to start the IRQ #s from 16 instead.
>>
>> [1] https://lore.kernel.org/all/5e001ec1-d3f1-bcb8-7f30-a6301fd9930c@omp.ru/
>>
>> Signed-off-by: Sergey Shtylyov <s.shtylyov@....ru>
>>
>> ---
>> The patch is against Linus Torvalds' 'linux.git' repo.
>>
>>  arch/sh/kernel/cpu/sh3/entry.S |    4 ++--
>>  include/linux/sh_intc.h        |    6 +++---
>>  2 files changed, 5 insertions(+), 5 deletions(-)
>>
>> Index: linux/arch/sh/kernel/cpu/sh3/entry.S
>> ===================================================================
>> --- linux.orig/arch/sh/kernel/cpu/sh3/entry.S
>> +++ linux/arch/sh/kernel/cpu/sh3/entry.S
>> @@ -470,9 +470,9 @@ ENTRY(handle_interrupt)
>>  	mov	r4, r0		! save vector->jmp table offset for later
>>  
>>  	shlr2	r4		! vector to IRQ# conversion
>> -	add	#-0x10, r4
>>  
>> -	cmp/pz	r4		! is it a valid IRQ?
>> +	mov	#0x10, r5
>> +	cmp/ge	r5, r4		! is it a valid IRQ?
> 
>    Maybe I should've used cmp/hs... my 1st try at SH assembly! :-)

I can test your revised patch next week on my SH7785LCR.

Thanks,
Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@...ian.org
`. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
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