On 11/05/2012 08:25 PM, David Miller wrote:

From: Michel Lespinasse <redacted>
Date: Mon,  5 Nov 2012 14:47:12 -0800

quoted

Update the sparc32 arch_get_unmapped_area function to make use of
vm_unmapped_area() instead of implementing a brute force search.

Signed-off-by: Michel Lespinasse <redacted>

Hmmm...

quoted

-	if (flags & MAP_SHARED)
-		addr = COLOUR_ALIGN(addr);
-	else
-		addr = PAGE_ALIGN(addr);

What part of vm_unmapped_area() is going to duplicate this special
aligning logic we need on sparc?

That would be this part:

+found:
+	/* We found a suitable gap. Clip it with the original low_limit. */
+	if (gap_start < info->low_limit)
+		gap_start = info->low_limit;
+
+	/* Adjust gap address to the desired alignment */
+	gap_start += (info->align_offset - gap_start) & info->align_mask;
+
+	VM_BUG_ON(gap_start + info->length > info->high_limit);
+	VM_BUG_ON(gap_start + info->length > gap_end);
+	return gap_start;
+}