linux-kernel - Re: [PATCH] mtd: spi-nor: core: correct type of i to be signed

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Message-ID: <d6596dd7-4d80-4024-af2b-c4f6c9da1084@collabora.com>
Date: Mon, 4 Mar 2024 13:46:21 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Tudor Ambarus <tudor.ambarus@...aro.org>,
 Michael Walle <mwalle@...nel.org>, Pratyush Yadav <pratyush@...nel.org>,
 Miquel Raynal <miquel.raynal@...tlin.com>,
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>,
 Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>, kernel@...labora.com,
 kernel-janitors@...r.kernel.org, linux-mtd@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: spi-nor: core: correct type of i to be signed

On 3/4/24 12:51 PM, Tudor Ambarus wrote:
> 
> 
> On 3/1/24 15:04, Michael Walle wrote:
>> Hi,
>>
>> On Fri Mar 1, 2024 at 3:45 PM CET, Muhammad Usama Anjum wrote:
>>> The i should be signed to find out the end of the loop. Otherwise,
>>> i >= 0 is always true and loop becomes infinite.
>>>
>>> Fixes: 6a9eda34418f ("mtd: spi-nor: core: set mtd->eraseregions for non-uniform erase map")
>>> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
>>> ---
>>>  drivers/mtd/spi-nor/core.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
>>> index 65b32ea59afc6..46bc45b80883f 100644
>>> --- a/drivers/mtd/spi-nor/core.c
>>> +++ b/drivers/mtd/spi-nor/core.c
>>> @@ -3373,7 +3373,7 @@ static u32
>>>  spi_nor_get_region_erasesize(const struct spi_nor_erase_region *region,
>>>  			     const struct spi_nor_erase_type *erase_type)
>>>  {
>>> -	u8 i;
>>> +	s8 i;
>>
>> Can we just have an "int" here. So we don't shoot ourselves in the
> 
> Muhammad, do you care to resubmit using int? Would be better indeed.
I'm sending a v2 with int.

> 
>> foot again. I'm really no friend of these kind of micro
>> optimizations, it should have been int in the first place IMHO.
>>
>> -michael
>>
>>>  
>>>  	if (region->overlaid)
>>>  		return region->size;
>>
> 

-- 
BR,
Muhammad Usama Anjum