linux-kernel - Re: [PATCH v2 01/28] spi: s3c64xx: explicitly include <linux/io.h>

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Date: Fri, 26 Jan 2024 14:40:48 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Sam Protsenko <semen.protsenko@...aro.org>
Cc: broonie@...nel.org, andi.shyti@...nel.org, arnd@...db.de,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 alim.akhtar@...sung.com, linux-spi@...r.kernel.org,
 linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-arch@...r.kernel.org, andre.draszik@...aro.org,
 peter.griffin@...aro.org, kernel-team@...roid.com, willmcvicker@...gle.com
Subject: Re: [PATCH v2 01/28] spi: s3c64xx: explicitly include <linux/io.h>



On 1/25/24 18:58, Sam Protsenko wrote:
> On Thu, Jan 25, 2024 at 8:50 AM Tudor Ambarus <tudor.ambarus@...aro.org> wrote:
>>
>> The driver uses readl() but does not include <linux/io.h>.
>>
>> It is good practice to directly include all headers used, it avoids
>> implicit dependencies and spurious breakage if someone rearranges
>> headers and causes the implicit include to vanish.
>>
>> Include the missing header.
>>
>> Fixes: 230d42d422e7 ("spi: Add s3c64xx SPI Controller driver")
> 
> Not sure the "Fixes" tag is needed here. AFAIU, this patch doesn't fix

fixes tag indicates which commit failed to include the necessary header

> any actual bugs, seems more like a style fix to me. In other words,

not yet, but we can't estimate what header get rearranged and whether it
will cause the implicit include to vanish.

> I'm not convinced it has to be necessarily backported to stable
> kernels. The same goes for another similar patch from this series.

It would be good to have this in the stable kernels for the reasons
described in the commit message.

> 
>> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
>> ---
>>  drivers/spi/spi-s3c64xx.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
>> index 7f7eb8f742e4..c1cbc4780a3b 100644
>> --- a/drivers/spi/spi-s3c64xx.c
>> +++ b/drivers/spi/spi-s3c64xx.c
>> @@ -10,6 +10,7 @@
>>  #include <linux/clk.h>
>>  #include <linux/dma-mapping.h>
>>  #include <linux/dmaengine.h>
>> +#include <linux/io.h>
>>  #include <linux/platform_device.h>
>>  #include <linux/pm_runtime.h>
>>  #include <linux/spi/spi.h>
>> --
>> 2.43.0.429.g432eaa2c6b-goog
>>