Re: Problems Building Bluetooth with K6 and CONFIG_REGPARM

From: Brian Gerst (bgerst_at_didntduck.org)
Date: 09/08/05

  • Next message: Dmitry Torokhov: "Input: seeking internal API recommendation" 
    Date:	Thu, 08 Sep 2005 12:49:17 -0400
To: Horms <horms@verge.net.au>

    Horms wrote:
    > Hi Andy,
    >
    > that does indeed seem to be a problem. I have narrowed it down to
    > a combination of using K6 and CONFIG_REGPARM. Hunting around a bit
    > I found this http://my.execpc.com/~geezer/osd/gotchas/, which
    > suggests the problem is that the asm in question tries to add a register
    > to the clobber list which is not available. This makes sense,
    > I guess REGPARM is using edx, so inline assembly can't.
    >
    > I've CCed the bluetooth maintainers and lkml, hopefully someone there
    > will have some input on how to resolve this problem, as inline assembly
    > isn't my strong point and the problem seems to manifest in Linus' current
    > git tree.
    >
    > The relevant code is the following call to BUILDIO(b,b,char) towards the
    > bottom of include/asm/io.h
    >
    > BUILDIO is as follows, and I am guessing it is the "Nd"(port) and
    > possibley "d"(port) portions that are problematic.

    Sounds like a compiler bug, especially since changing the CPU type fixes
    it. What version of GCC? 

    --
				Brian Gerst
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