We will make code changes in the next patch. To make the review easier split
the documentation update in to a seperate patch.
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
---
arch/powerpc/mm/slice.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index 98b53d48968f..259bbda9a222 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -478,7 +478,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr,
unsigned long len,
* already
*/
slice_mask_for_size(mm, psize, &good_mask, high_limit);
- slice_print_mask(" good_mask", good_mask);
+ slice_print_mask("Mask for page size", good_mask);
/*
* Here "good" means slices that are already the right page size,
@@ -507,15 +507,17 @@ unsigned long slice_get_unmapped_area(unsigned long addr,
unsigned long len,
slice_or_mask(&good_mask, &compat_mask);
}
#endif
-
/* First check hint if it's valid or if we have MAP_FIXED */
if (addr != 0 || fixed) {
- /* Build a mask for the requested range */
+ /*
+ * Build a mask for the requested range
+ */
slice_range_to_mask(addr, len, &mask);
- slice_print_mask(" mask", mask);
+ slice_print_mask("Request range mask", mask);
- /* Check if we fit in the good mask. If we do, we just return,
- * nothing else to do
+ /*
+ * Check if we fit in the good mask. If we do, we just
+ * return, nothing else to do
*/
if (slice_check_fit(mm, mask, good_mask)) {
slice_dbg(" fits good !\n");
@@ -553,8 +555,8 @@ unsigned long slice_get_unmapped_area(unsigned long addr,
unsigned long len,
return -EBUSY;
slice_dbg(" search...\n");
-
- /* If we had a hint that didn't work out, see if we can fit
+ /*
+ * If we had a hint that didn't work out, see if we can fit
* anywhere in the good area.
*/
if (addr) {
@@ -573,7 +575,16 @@ unsigned long slice_get_unmapped_area(unsigned long addr,
unsigned long len,
psize, topdown, high_limit);
#ifdef CONFIG_PPC_64K_PAGES
+ /*
+ * If we didn't request for fixed mapping, we never looked at
+ * compat area. Now that we are not finding space, let's look
+ * at the 4K slice also.
+ */
if (addr == -ENOMEM && psize == MMU_PAGE_64K) {
+ /*
+ * mask variable is free here. Use that for compat
+ * size mask.
+ */
/* retry the search with 4k-page slices included */
slice_or_mask(&potential_mask, &compat_mask);
addr = slice_find_area(mm, len, potential_mask,
--
2.14.3
