Re: [Dri-devel] [2.6 patch] disallow DRM on 386

From: Adrian Bunk (bunk_at_fs.tum.de)
Date: 01/21/04

  • Next message: Greg KH: "Re: 2.6.1-mm5" 
    Date:	Wed, 21 Jan 2004 01:28:27 +0100
To: Alan Cox <alan@lxorguk.ukuu.org.uk>

    On Wed, Jan 21, 2004 at 12:04:59AM +0000, Alan Cox wrote:
    > On Maw, 2004-01-20 at 21:24, Adrian Bunk wrote:
    > > I got the following compile error in 2.6.1-mm5 with X86_CMPXCHG=n.
    > > This problem is not specific to -mm, and it always occurs when you
    > > include support for the 386 cpu (oposed to the 486 or later cpus) since
    > > in this case X86_CMPXCHG=n and therefoore cmpxchg isn't defined in
    > > include/asm-i386/system.h .
    > >
    > > The patch below disallows DRM if X86_CMPXCHG=n.
    >
    > Ugly.
    >
    > Fix system.h to always define cmpxchg.h and check its presence at
    > runtime when the DRM module loads, then you can build 386 kernels that
    > support DRI on higher machines.
    >
    > The problem isnt that cmpxchg definitely doesn't exist, so system.h is
    > wrong IMHO

    ???

    AFAIR cmpxchg wasn't present in cpus earlier than the 486.

    cu
    Adrian 

    -- 
       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed
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