linux-kernel - Re: [PATCH v1] clocksource/drivers/arm_global_timer: Simplify prescaler register access

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Date: Thu, 22 Feb 2024 23:34:24 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: tglx@...utronix.de, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, patrice.chotard@...s.st.com,
 linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH v1] clocksource/drivers/arm_global_timer: Simplify
 prescaler register access

On 22/02/2024 22:57, Martin Blumenstingl wrote:
> Hi Daniel,
> 
> On Thu, Feb 22, 2024 at 11:02 AM Daniel Lezcano
> <daniel.lezcano@...aro.org> wrote:
> [ ... ]
>>
>>>                /* prescaler within legal range? */
>>> -             if (psv < 0 || psv > GT_CONTROL_PRESCALER_MAX)
>>> +             if (psv < 0 || psv > FIELD_GET(GT_CONTROL_PRESCALER_MASK, ~0))
>>
>>                  FIELD_MAX() ?
> Oh, I was not aware of FIELD_MAX() - thank you!
> While researching that I found that there's also FIELD_FIT() which I
> think is perfect here. What do you think?

Ah yes, even better :)

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