The patch titled
Subject: idr: add idr_layer->prefix
has been removed from the -mm tree. Its filename was
idr-add-idr_layer-prefix.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Tejun Heo <tj@xxxxxxxxxx>
Subject: idr: add idr_layer->prefix
Add a field which carries the prefix of ID the idr_layer covers. This
will be used to implement lookup hint.
This patch doesn't make use of the new field and doesn't introduce any
behavior difference.
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/idr.h | 1 +
lib/idr.c | 13 +++++++++++++
2 files changed, 14 insertions(+)
diff -puN include/linux/idr.h~idr-add-idr_layer-prefix include/linux/idr.h
--- a/include/linux/idr.h~idr-add-idr_layer-prefix
+++ a/include/linux/idr.h
@@ -28,6 +28,7 @@
#define IDR_MASK ((1 << IDR_BITS)-1)
struct idr_layer {
+ int prefix; /* the ID prefix of this idr_layer */
DECLARE_BITMAP(bitmap, IDR_SIZE); /* A zero bit means "space here" */
struct idr_layer __rcu *ary[1<<IDR_BITS];
int count; /* When zero, we can release it */
diff -puN lib/idr.c~idr-add-idr_layer-prefix lib/idr.c
--- a/lib/idr.c~idr-add-idr_layer-prefix
+++ a/lib/idr.c
@@ -60,6 +60,16 @@ static int idr_max(int layers)
return (1 << bits) - 1;
}
+/*
+ * Prefix mask for an idr_layer at @layer. For layer 0, the prefix mask is
+ * all bits except for the lower IDR_BITS. For layer 1, 2 * IDR_BITS, and
+ * so on.
+ */
+static int idr_layer_prefix_mask(int layer)
+{
+ return ~idr_max(layer + 1);
+}
+
static struct idr_layer *get_from_free_list(struct idr *idp)
{
struct idr_layer *p;
@@ -272,6 +282,7 @@ static int sub_alloc(struct idr *idp, in
if (!new)
return -ENOMEM;
new->layer = l-1;
+ new->prefix = id & idr_layer_prefix_mask(new->layer);
rcu_assign_pointer(p->ary[m], new);
p->count++;
}
@@ -313,6 +324,7 @@ build_up:
* upwards.
*/
p->layer++;
+ WARN_ON_ONCE(p->prefix);
continue;
}
if (!(new = idr_layer_alloc(gfp_mask, layer_idr))) {
@@ -334,6 +346,7 @@ build_up:
new->ary[0] = p;
new->count = 1;
new->layer = layers-1;
+ new->prefix = id & idr_layer_prefix_mask(new->layer);
if (bitmap_full(p->bitmap, IDR_SIZE))
__set_bit(0, new->bitmap);
p = new;
_
Patches currently in -mm which might be from tj@xxxxxxxxxx are
origin.patch
linux-next.patch
slub-correctly-bootstrap-boot-caches.patch
block-restore-proc-partitions-to-not-display-non-partitionable-removable-devices.patch
coredump-only-sigkill-should-interrupt-the-coredumping-task.patch
coredump-ensure-that-sigkill-always-kills-the-dumping-thread.patch
coredump-sanitize-the-setting-of-signal-group_exit_code.patch
coredump-factor-out-the-setting-of-pf_dumpcore.patch
freezer-do-not-send-a-fake-signal-to-a-pf_dumpcore-thread.patch
coredump-make-wait_for_dump_helpers-freezable.patch
nfsd-idr_destroy-no-longer-needs-idr_remove_all.patch
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