[PATCH 11/11] afs: Fix dirty-region encoding on ppc32 with 64K pages

[David Howells]

Matthew Wilcox <willy at infradead.org> wrote:

> > +{
> > +	if (PAGE_SIZE - 1 <= __AFS_PAGE_PRIV_MASK)
> > +		return 1;
> > +	else
> > +		return PAGE_SIZE / (__AFS_PAGE_PRIV_MASK + 1);
> 
> Could this be DIV_ROUND_UP(PAGE_SIZE, __AFS_PAGE_PRIV_MASK + 1); avoiding
> a conditional?  I appreciate it's calculated at compile time today, but
> it'll be dynamic with THP.

Hmmm - actually, I want a shift size, not a number of bytes as I divide by it
twice in afs_page_dirty().

David