Re: [BUGFIX]{PATCH] flush icache on ia64 take2

Zoltan Menyhart
2007-07-06T09:41:38Z

KAMEZAWA Hiroyuki wrote:

> Note1: icache flush is called only when VM_EXEC flag is on and
> PG_arch_1 is not set.

If you have not got the page in the cache, then the new page will
be allocated with PG_arch_1 bit off.
You are going to flush pages which are read by HW DMA, i.e. the L2I
of Montecito does not keep old lines for those pages anyway.

...->a_ops->readpage() of "L2I safe" file systems should set PG_arch_1
if the CPU is ia64 and it has got separate L2I.

On the other hand, arch. independent file systems should not play with
PG_arch_1.
The base kernel should export a macro for the file systems...

Thanks,

Zoltan Menyhart