[ath9k-devel] [PATCH 1/3] ath9k: Fix build error on ARM

Russell King - ARM Linux linux at arm.linux.org.uk
Wed Feb 5 06:50:35 EST 2014

On Tue, Feb 04, 2014 at 08:36:36AM -0800, 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?

No, the point of __bad_udelay() is that people doing stupidly large
udelay()s result in build errors, rather than having to run the kernel
and trip over a non-existent debugging message beacuse they haven't
built the kernel with DEBUG defined.


FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up.  Estimation
in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad.
Estimate before purchase was "up to 13.2Mbit".

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