Re: [bigmem-patch] 4GB with Linux on IA32

Andrea Arcangeli
1999-08-16T23:49:41Z

On Mon, 16 Aug 1999, Kanoj Sarcar wrote:

>I was also talking about drivers which assume that all of memory is
>direct mapped. For example, __va and __pa assume this. There might be
>other macros/procedures which have the same assumption built in.
>Basically, anything that is dependent on PAGE_OFFSET needs to be
>checked.

Only places that may deal with bigmem pages and the core of the kernel
must be checked. I don't exclude there still something to fix (as happened
with kernel/ptrace.c and /proc/*/mem) but with the current design we
shouldn't need to touch the device drivers at all.

The only real problem currently seems to be raw-io to me... (hints?)

Andrea