Re: 2.6.0-test3-mm1: scheduling while atomic (ext3?)

From: Alan Cox (alan_at_lxorguk.ukuu.org.uk)
Date: 08/13/03

  • Next message: Felipe Alfaro Solana: "OPL3SA2: spin_is_locked on uninitialized spinlock" 
    To: Andrew Morton <akpm@osdl.org>
Date:	13 Aug 2003 12:40:04 +0100

    On Mer, 2003-08-13 at 12:25, Andrew Morton wrote:
    > Like this?
    >
    > What happens if someone runs a K6 kernel on a K7?
    > Or various other CPU types? What is the matrix here?

    Beats me, but then the prefetch code in 2.6 seems broken from
    5 seconds of inspection anyway. We are testing the XMM feature
    and using prefetchnta for Athlon, thats wrong for lots of athlon
    processors that dont have XMM but do have prefetch/prefetchw,
    (which btw also seem to work properly on all these processors
     while prefetchnta seems to do funky things)

    Perhaps someone should fix prefetch() before they worry about
    the rest of the mess ?

    For Athlon we should be testing 3Dnow, and using prefetch/prefetchw
    for Intel cases we want to go for prefetchnta if XMM is set (PIII, PIV)

    Alan

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