Re: _PAGE_PCD bit in DMAable memory

[Ingo Oeser]

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On Tuesday 18 May 2004 21:03, you wrote:
> Thanks much for the reply. I forgot to mention I am on
> Linux 2.4.20. I looked into 2.6 and could see what you
> described in your email. The comment on top of
> consistent_alloc() for arm (2.4.20) says it will give
> cache-coherent memory, but i am not able to see how
> this is made possible for Xscale when if it doesn't
> set the L_PTE_CACHEABLE to 0 (for 2.4.20, again).

There it is hidden in arch/arm/mm/ioremap.c

look at the L_ flags there and how L_PTE_CACHEABLE is missing there by default.

PS: This can be found easily with grep. Try this little Bash script to grep recursively 
      through the kernel and answer your questions more quickly:

#!/bin/bash
if [ $# -lt 2 ]; then
        PROGNAME=`basename $0`
        echo -e "$PROGNAME - find a string in a tree of *.c and *.h files"
        echo -e "Usage:\t$PROGNAME <start dir> <what>\n"
        exit 1
fi

DIR=$1
shift
exec find "${DIR}" -type f -name '*.[ch]' -print0 |xargs -0 grep -A8 "$@"


Regards

Ingo Oeser
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