The patch titled
Subject: include/linux/nodemask.h: create next_node_in() helper
has been added to the -mm tree. Its filename is
include-linux-nodemaskh-create-next_node_in-helper.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/include-linux-nodemaskh-create-next_node_in-helper.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/include-linux-nodemaskh-create-next_node_in-helper.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: include/linux/nodemask.h: create next_node_in() helper
Lots of code does
node = next_node(node, XXX);
if (node == MAX_NUMNODES)
node = first_node(XXX);
so create next_node_in() to do this and use it in various places.
Cc: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: "Laura Abbott" <lauraa@xxxxxxxxxxxxxx>
Cc: Hui Zhu <zhuhui@xxxxxxxxxx>
Cc: Wang Xiaoqiang <wangxq10@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/nodemask.h | 18 +++++++++++++++++-
kernel/cpuset.c | 8 +-------
mm/hugetlb.c | 4 +---
mm/memcontrol.c | 4 +---
mm/mempolicy.c | 8 ++------
mm/page_isolation.c | 9 +++------
mm/slab.c | 13 +++----------
7 files changed, 28 insertions(+), 36 deletions(-)
diff -puN include/linux/nodemask.h~include-linux-nodemaskh-create-next_node_in-helper include/linux/nodemask.h
--- a/include/linux/nodemask.h~include-linux-nodemaskh-create-next_node_in-helper
+++ a/include/linux/nodemask.h
@@ -43,8 +43,10 @@
*
* int first_node(mask) Number lowest set bit, or MAX_NUMNODES
* int next_node(node, mask) Next node past 'node', or MAX_NUMNODES
+ * int next_node_in(node, mask) Next node past 'node', or wrap to first,
+ * or MAX_NUMNODES
* int first_unset_node(mask) First node not set in mask, or
- * MAX_NUMNODES.
+ * MAX_NUMNODES
*
* nodemask_t nodemask_of_node(node) Return nodemask with bit 'node' set
* NODE_MASK_ALL Initializer - all bits set
@@ -259,6 +261,20 @@ static inline int __next_node(int n, con
return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1));
}
+/*
+ * Find the next present node in src, starting after node n, wrapping around to
+ * the first node in src if needed. Returns MAX_NUMNODES if src is empty.
+ */
+#define next_node_in(n, src) __next_node_in((n), &(src))
+static inline int __next_node_in(int node, const nodemask_t *srcp)
+{
+ int ret = __next_node(node, srcp);
+
+ if (ret == MAX_NUMNODES)
+ ret = __first_node(srcp);
+ return ret;
+}
+
static inline void init_nodemask_of_node(nodemask_t *mask, int node)
{
nodes_clear(*mask);
diff -puN kernel/cpuset.c~include-linux-nodemaskh-create-next_node_in-helper kernel/cpuset.c
--- a/kernel/cpuset.c~include-linux-nodemaskh-create-next_node_in-helper
+++ a/kernel/cpuset.c
@@ -2591,13 +2591,7 @@ int __cpuset_node_allowed(int node, gfp_
static int cpuset_spread_node(int *rotor)
{
- int node;
-
- node = next_node(*rotor, current->mems_allowed);
- if (node == MAX_NUMNODES)
- node = first_node(current->mems_allowed);
- *rotor = node;
- return node;
+ return *rotor = next_node_in(*rotor, current->mems_allowed);
}
int cpuset_mem_spread_node(void)
diff -puN mm/hugetlb.c~include-linux-nodemaskh-create-next_node_in-helper mm/hugetlb.c
--- a/mm/hugetlb.c~include-linux-nodemaskh-create-next_node_in-helper
+++ a/mm/hugetlb.c
@@ -937,9 +937,7 @@ err:
*/
static int next_node_allowed(int nid, nodemask_t *nodes_allowed)
{
- nid = next_node(nid, *nodes_allowed);
- if (nid == MAX_NUMNODES)
- nid = first_node(*nodes_allowed);
+ nid = next_node_in(nid, *nodes_allowed);
VM_BUG_ON(nid >= MAX_NUMNODES);
return nid;
diff -puN mm/memcontrol.c~include-linux-nodemaskh-create-next_node_in-helper mm/memcontrol.c
--- a/mm/memcontrol.c~include-linux-nodemaskh-create-next_node_in-helper
+++ a/mm/memcontrol.c
@@ -1388,9 +1388,7 @@ int mem_cgroup_select_victim_node(struct
mem_cgroup_may_update_nodemask(memcg);
node = memcg->last_scanned_node;
- node = next_node(node, memcg->scan_nodes);
- if (node == MAX_NUMNODES)
- node = first_node(memcg->scan_nodes);
+ node = next_node_in(node, memcg->scan_nodes);
/*
* We call this when we hit limit, not when pages are added to LRU.
* No LRU may hold pages because all pages are UNEVICTABLE or
diff -puN mm/mempolicy.c~include-linux-nodemaskh-create-next_node_in-helper mm/mempolicy.c
--- a/mm/mempolicy.c~include-linux-nodemaskh-create-next_node_in-helper
+++ a/mm/mempolicy.c
@@ -347,9 +347,7 @@ static void mpol_rebind_nodemask(struct
BUG();
if (!node_isset(current->il_next, tmp)) {
- current->il_next = next_node(current->il_next, tmp);
- if (current->il_next >= MAX_NUMNODES)
- current->il_next = first_node(tmp);
+ current->il_next = next_node_in(current->il_next, tmp);
if (current->il_next >= MAX_NUMNODES)
current->il_next = numa_node_id();
}
@@ -1709,9 +1707,7 @@ static unsigned interleave_nodes(struct
struct task_struct *me = current;
nid = me->il_next;
- next = next_node(nid, policy->v.nodes);
- if (next >= MAX_NUMNODES)
- next = first_node(policy->v.nodes);
+ next = next_node_in(nid, policy->v.nodes);
if (next < MAX_NUMNODES)
me->il_next = next;
return nid;
diff -puN mm/page_isolation.c~include-linux-nodemaskh-create-next_node_in-helper mm/page_isolation.c
--- a/mm/page_isolation.c~include-linux-nodemaskh-create-next_node_in-helper
+++ a/mm/page_isolation.c
@@ -288,13 +288,10 @@ struct page *alloc_migrate_target(struct
* accordance with memory policy of the user process if possible. For
* now as a simple work-around, we use the next node for destination.
*/
- if (PageHuge(page)) {
- int node = next_online_node(page_to_nid(page));
- if (node == MAX_NUMNODES)
- node = first_online_node;
+ if (PageHuge(page))
return alloc_huge_page_node(page_hstate(compound_head(page)),
- node);
- }
+ next_node_in(page_to_nid(page),
+ node_online_map));
if (PageHighMem(page))
gfp_mask |= __GFP_HIGHMEM;
diff -puN mm/slab.c~include-linux-nodemaskh-create-next_node_in-helper mm/slab.c
--- a/mm/slab.c~include-linux-nodemaskh-create-next_node_in-helper
+++ a/mm/slab.c
@@ -519,22 +519,15 @@ static DEFINE_PER_CPU(unsigned long, sla
static void init_reap_node(int cpu)
{
- int node;
-
- node = next_node(cpu_to_mem(cpu), node_online_map);
- if (node == MAX_NUMNODES)
- node = first_node(node_online_map);
-
- per_cpu(slab_reap_node, cpu) = node;
+ per_cpu(slab_reap_node, cpu) = next_node_in(cpu_to_mem(cpu),
+ node_online_map);
}
static void next_reap_node(void)
{
int node = __this_cpu_read(slab_reap_node);
- node = next_node(node, node_online_map);
- if (unlikely(node >= MAX_NUMNODES))
- node = first_node(node_online_map);
+ node = next_node_in(node, node_online_map);
__this_cpu_write(slab_reap_node, node);
}
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
i-need-old-gcc.patch
arch-alpha-kernel-systblss-remove-debug-check.patch
drivers-gpu-drm-i915-intel_spritec-fix-build.patch
drivers-gpu-drm-i915-intel_tvc-fix-build.patch
sched-add-schedule_timeout_idle.patch
drivers-input-eliminate-input_compat_test-macro.patch
mm-kasan-stackdepot-implementation-enable-stackdepot-for-slab-fix.patch
arm-arch-arm-include-asm-pageh-needs-personalityh.patch
mm.patch
include-linux-apply-__malloc-attribute-checkpatch-fixes.patch
include-linux-nodemaskh-create-next_node_in-helper.patch
ksm-introduce-ksm_max_page_sharing-per-page-deduplication-limit-fix-2.patch
mm-oom-rework-oom-detection-checkpatch-fixes.patch
mm-use-watermak-checks-for-__gfp_repeat-high-order-allocations-checkpatch-fixes.patch
drivers-net-wireless-intel-iwlwifi-dvm-calibc-fix-min-warning.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
kernel-forkc-export-kernel_thread-to-modules.patch
slab-leaks3-default-y.patch
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