Re: [PATCH v2 00/21] Converge on using secs_to_jiffies()

[Przemek Kitszel <przemyslaw.kitszel@xxxxxxxxx>]

On 12/6/24 9:58 PM, Easwar Hariharan wrote:
> On 11/29/2024 4:57 AM, Przemek Kitszel wrote:
> > [removed most non-list recipients, it's just too much]
> >
> > On 11/15/24 10:26 PM, Easwar Hariharan wrote:
> <snip>

> > Regarding code - you could also convert msecs_to_jiffies(const * HZ),
> > there are 10 that are greppable.
>
> Those seem to be mistakes. const*HZ is a seconds-denominated timeout,
> being passed to msecs_to_jiffies() which will treat it as a
> millisecond-denominated timeout resulting in an excessively long
> timeout. I suppose that's better than a too-short timeout, and
> apparently it's been working fine all along since hardware responds
> before the too-long timeout expires. Half of them are in
> drivers/scsi/arcmsr/arcmsr_hba.c and the pattern has apparently been
> there since 2010.

my point was that, the default value of HZ is 1000, and most of the code
that is just `$value*HZ` was meant as "$value seconds, in ms unit".

Same for HZ/const, HZ/2 being 500ms.

HZ is awful in that it is not 1s but 1/s, but it was easy to abuse the
value in simple context.

If you happen to touch this, please do in a separate series, to get more
attention from drivers owners.

> Thanks,
> Easwar