Hugh Dickins :
quoted text
> Aren't you just guessing there?  Those kunmap_atomics in at91_mci.c
> may look wrong to you, but they're not incorrect (so long as sg->offset
> falls within the page, as it must do here to make sense of the page).
> Especially not on ARM, where kunmap_atomic actually has no interest
> in the argument passed.  And the oops was in the flush_dcache_page.
> 
> If you actually reproduced Nicolas' problem on ARM, and verified
> that your patch then fixes it, please let us know: that will be
> remarkably interesting.

Patch tested without success. Indeed, I always see the Oops with 
Marc's patch.

quoted text
> I believe I posted the correct fix last night (or at least a safe fix
> for now: Christoph Lameter may prefer to undo it and change ARM's
> dma_mapping at leisure later), checking PageSlab in page_mapping;
> and Linus has already put that one into his git tree.

Here:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=b9bae3...

quoted text
> But it would be good to hear from Nicolas whether that indeed fixes
> his oops: I couldn't actually try my patch on ARM either.

Ok tested on Atmel ARM AT91 (at91sam9263), this fixes this oops.

Thanks a lot to all of you for your precise help.

Regards,
-- 
Nicolas Ferre


-
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/