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Date: Sun, 7 Jun 2015 10:31:37 +0200 From: Nicholas Mc Guire <der.herr@...r.at> To: David Miller <davem@...emloft.net> Cc: hofrat@...dl.org, romieu@...zoreil.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] wan: dscc4: use msecs_to_jiffies for conversions On Sun, 07 Jun 2015, David Miller wrote: > From: Nicholas Mc Guire <hofrat@...dl.org> > Date: Sat, 6 Jun 2015 10:41:06 +0200 > > > API compliance scanning with coccinelle flagged: > > ./drivers/net/wan/dscc4.c:1036:1-33: > > WARNING: timeout (10) seems HZ dependent > > ./drivers/net/wan/dscc4.c:554:2-34: > > WARNING: timeout (10) seems HZ dependent > > ./drivers/net/wan/dscc4.c:599:2-34: > > WARNING: timeout (10) seems HZ dependent > > > > Numeric constants passed to schedule_timeout_*() make the effective > > timeout HZ dependent which does not seem to be the intent here. > > Fixed up by converting the constant to jiffies with msecs_to_jiffies() > > > > Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org> > > Whoever wrote these things probably wanted whatever this amounts > to when HZ=100, so that is the only valid transformation you can > make to fix this up here. > > Otherwise you seriously risk breaking the driver. I did not find dscc4 in the 2.2 series of kernels so it does not predate configurable HZ - or do you mean simply that increasing the timeout here should be side-effect free and thus the larger of the values should be taken ? - though that would imply that it is possibly now broken for HZ=1000. Will fix it up to 10 == 100ms and fix the patch documentation. thx! hofrat -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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