From: Joe Perches <joe@perches.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org,
Holger Schurig <holgerschurig@gmail.com>,
Russell King <linux@arm.linux.org.uk>,
ath9k-devel <ath9k-devel@lists.ath9k.org>,
Sujith Manoharan <sujith@msujith.org>,
linux-wireless <linux-wireless@vger.kernel.org>,
John Linville <linville@tuxdriver.com>
Subject: Re: [ath9k-devel] [PATCH 1/3] ath9k: Fix build error on ARM
Date: Tue, 04 Feb 2014 11:43:46 -0800 [thread overview]
Message-ID: <1391543026.2538.28.camel@joe-AO722> (raw)
In-Reply-To: <3469296.SINb5BZOG8@wuerfel>
On Tue, 2014-02-04 at 19:40 +0100, Arnd Bergmann wrote:
> On Tuesday 04 February 2014 08:36:36 Joe Perches wrote:
> > On Tue, 2014-02-04 at 08:03 +0100, Holger Schurig wrote:
> > > Joe, look in linux/arch/arm/include/asm/delay.h. The macro udelay
> > > cannot handle large values because of lost-of-precision.
> > >
> > > IMHO udelay on ARM is broken, because it also cannot work with fast
> > > ARM processors (where bogomips >= 3355, which is in sight now). It's
> > > just not broken enought that someone did something against it ... so
> > > the current kludge is good enought.
> >
> > Maybe something like this would be better?
> >
>
> I actually like the fact that we get link errors for insane 'udelay'
> times.
For static values yes, for computed values no.
This emits a warning/dump_stack on the non-static
values. It could also emit some similar #warning
on static values > insane too.
next prev parent reply other threads:[~2014-02-04 19:43 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-04 3:07 [PATCH 0/3] ath9k patches Sujith Manoharan
2014-02-04 3:07 ` [PATCH 1/3] ath9k: Fix build error on ARM Sujith Manoharan
2014-02-04 3:34 ` Joe Perches
2014-02-04 3:40 ` Sujith Manoharan
2014-02-04 7:03 ` [ath9k-devel] " Holger Schurig
2014-02-04 12:59 ` [PATCH] checkpatch: Add test for long udelay Joe Perches
2014-02-04 16:36 ` [ath9k-devel] [PATCH 1/3] ath9k: Fix build error on ARM Joe Perches
2014-02-04 18:40 ` Arnd Bergmann
2014-02-04 19:43 ` Joe Perches [this message]
2014-02-05 11:50 ` Russell King - ARM Linux
2014-02-05 12:32 ` Joe Perches
2014-02-05 12:41 ` Russell King - ARM Linux
2014-02-05 13:04 ` Joe Perches
2014-02-05 13:39 ` Russell King - ARM Linux
2014-02-05 14:03 ` Joe Perches
2014-02-05 14:21 ` Russell King - ARM Linux
2014-02-05 15:05 ` Joe Perches
2014-02-04 3:07 ` [PATCH 2/3] ath9k: Do not support PowerSave by default Sujith Manoharan
2014-02-04 3:07 ` [PATCH 3/3] ath9k: Fix TX power calculation Sujith Manoharan
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