On Tue, 4 Jan 2005, Christoph Lameter wrote:

This patch introduces __GFP_ZERO as an additional gfp_mask element to allow
to request zeroed pages from the page allocator.

Ok, let's start merging this slowly, and in particular, this 1/4 one looks 
pretty much like a cleanup regardless of whatever else happen, so let's 
just do it. However, for it to really be a cleanup, how about making 
_this_ part:

+
+		if (gfp_flags & __GFP_ZERO) {
+#ifdef CONFIG_HIGHMEM
+			if (PageHighMem(page)) {
+				int n = 1 << order;
+
+				while (n-- >0)
+					clear_highpage(page + n);
+			} else
+#endif
+			clear_page(page_address(page), order);
+		}

Match the existing previous part:

 		if (order && (gfp_flags & __GFP_COMP))
 			prep_compound_page(page, order);

and just split it up into a "prep_zero_page(page, order)"? I dislike 
#ifdef's in the middle of deep functions. In the middle of a _trivial_ 
function it's much more palatable.

At that point at least part 1 ends up being a nice clean patch on its own, 
and should even shrink the code-size a bit. IOW, it not only is a cleanup, 
there is even a technical argument for it (even without worrying about the 
next stages).

Hmm?

		Linus
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"aart@kvack.org"> aart@kvack.org </a>