Re: [PATCH 2.2.10] Re: Problem with memmap file with SMP
Linus Torvalds (torvalds@transmeta.com)
Thu, 15 Jul 1999 09:39:37 -0700 (PDT)
On Thu, 15 Jul 1999, Stephen C. Tweedie wrote:
> > stable tree.
>
> Absolutely. The trouble is that a correct fix --- the clean way of
> doing things --- is to back-port the 2.3 changes, which is obviously a
> non-starter. The only real alternative to detecting the special case is
> to differentiate between writes from the page cache and writes from user
> buffers when we call f_op->write(), but that is a change in the
> definition of the VFS which I wanted to avoid for 2.2.
I wonder if the buffer cache is not the only thing that tries to write
from kernel space. You might be able to just do
if (get_fs() == KERNEL_DS)
return;
in update_vm_cache(), but I haven't actually looked at whether anybody
does kernel-writes anywhere else.
Linus
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