Re: 2.4.5-ac1 won't boot with 4GB bigmem option

[Alan Cox]

> I compiled and booted the 2.4.5-ac1 kernel with the CONFIG_HIGHMEM4G=y option 
> and got an oops in __alloc_pages() (called by alloc_bounce() called by 
> schedule()). Everything works fine if I turn the 4GB mode off.
> Machine is a Dell Precision with 2 Xeons and 2GB of RAM.
> 
> 2.4.5 works fine with the 4GB. Any idea what changed between the two?

The -ac tree has some VM differences for bigmem that really need to be
cleaned up and/or removed now the Linus tree is looking solid. I'll probably
drop those diffs for -ac2 so that folks are working against one set of VM