[Sdhci-devel] sdhci problems with debug log

[Simon Huggins]

On Tue, Jan 15, 2008 at 03:42:08PM +0000, Simon Huggins wrote:
> On Wed, Dec 05, 2007 at 10:46:39AM +0100, Pierre Ossman wrote:
> > What the feck... Something is seriously broken with the scheduling.
> > Try a busy-wait instead by replacing msleep() with mdelay().
> I tried mdelay (now in 2.6.24-rc7) and it didn't work
[..]
> I've been trying kernels which aren't SMP, don't use -Os and so on to
> try and eliminate things.  I'll try without laptop_mode kernel side at
> some point but disabling the stuff that turned it on in userspace didn't
> help.

Ok.  If I use an HZ=1000 then it works.  I don't have CONFIG_NO_HZ
(tickless kernel) enabled.

When I do use HZ=1000 I also get printed: mmc_detect_change(500) from
the old debugging code I left in whereas before with HZ=250 it was 125.

I don't know if this is your bug or the scheduler's but given that my
original post cited mmc_delay changes causing it perhaps it's still
broken for other values of HZ.

HZ is used directly a few times under mmc/ but I don't really know
enough to be able to check.

Anyway, hopefully this report helps.

-- 
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