On Tue, 7 Feb 2006, Andi Kleen wrote:
> Actually looking at it again "v" should be aligned to 4 bytes anyways, so
> there is a unused 2 byte hole that you can use for this.
Ok. Here is the hack you wanted:
Index: linux-2.6.16-rc2/mm/mempolicy.c
===================================================================
--- linux-2.6.16-rc2.orig/mm/mempolicy.c 2006-02-07 10:14:43.000000000 -0800
+++ linux-2.6.16-rc2/mm/mempolicy.c 2006-02-07 10:17:42.000000000 -0800
@@ -162,9 +162,9 @@ static struct mempolicy *mpol_new(int mo
return ERR_PTR(-ENOMEM);
atomic_set(&policy->refcnt, 1);
- policy->gfp_flags = 0;
+ policy->gfp_flags_high = 0;
if (!nodes_equal(*nodes, node_online_map))
- policy->gfp_flags |= __GFP_NO_OOM_KILLER;
+ policy->gfp_flags_high |= (__GFP_NO_OOM_KILLER >> 16);
switch (mode) {
case MPOL_INTERLEAVE:
@@ -1224,7 +1224,7 @@ alloc_page_vma(gfp_t gfp, struct vm_area
cpuset_update_task_memory_state();
- gfp |= pol->gfp_flags;
+ gfp |= (pol->gfp_flags_high << 16);
if (unlikely(pol->policy == MPOL_INTERLEAVE)) {
unsigned nid;
@@ -1261,7 +1261,7 @@ struct page *alloc_pages_current(gfp_t g
cpuset_update_task_memory_state();
if (!pol || in_interrupt())
pol = &default_policy;
- gfp |= pol->gfp_flags;
+ gfp |= (pol->gfp_flags_high << 16);
if (pol->policy == MPOL_INTERLEAVE)
return alloc_page_interleave(gfp, order, interleave_nodes(pol));
return __alloc_pages(gfp, order, zonelist_policy(gfp, pol));
@@ -1598,7 +1598,7 @@ void mpol_rebind_policy(struct mempolicy
return;
if (!nodes_equal(*newmask, node_online_map))
- pol->gfp_flags |= __GFP_NO_OOM_KILLER;
+ pol->gfp_flags_high |= (__GFP_NO_OOM_KILLER >> 16);
switch (pol->policy) {
case MPOL_DEFAULT:
Index: linux-2.6.16-rc2/include/linux/mempolicy.h
===================================================================
--- linux-2.6.16-rc2.orig/include/linux/mempolicy.h 2006-02-07 10:14:43.000000000 -0800
+++ linux-2.6.16-rc2/include/linux/mempolicy.h 2006-02-07 10:15:39.000000000 -0800
@@ -62,7 +62,7 @@ struct vm_area_struct;
struct mempolicy {
atomic_t refcnt;
short policy; /* See MPOL_* above */
- gfp_t gfp_flags; /* flags ORed into gfp_flags for each allocation */
+ short gfp_flags_high; /* bits 16-31 ORed into gfp_flags for each allocation */
union {
struct zonelist *zonelist; /* bind */
short preferred_node; /* preferred */
-
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