Re: a synonym problem

[Paul M. <le...@li...>]

Saito-san,

On Tue, Feb 20, 2007 at 10:03:15AM +0900, Hideo Saito wrote:
> This problem is caused when a process is executed after vfork. In the
> result, the executed process can not read the arguments correctly.
> 
> I think that the copied arguments from parent process should be copied
> back to the physical memory as following patch, in other words, a
> mapped page to process should be copied back to the physical memory
> unconditionally.
> 
This is quite interesting. These are anonymous pages, so page->mapping
will be NULL unless you've got a swap cache page. The writeback should
not be deferred in this case.

Can you move your __flush_wback_region() in to the else path in
flush_dcache_page() in arch/sh/mm/cache-sh4.c and see if the problem
persists? Please also provide the n_aliases printk() from the boot log.