lib/idr.c: remove simple_ida_lock

Improve the scalability of the IDA by using the per-IDA xa_lock rather
than the global simple_ida_lock.  IDAs are not typically used in
performance-sensitive locations, but since we have this lock anyway, we
can use it.  It is also a step towards converting the IDA from the radix
tree to the XArray.

[akpm@linux-foundation.org: idr.c needs xarray.h]
Link: http://lkml.kernel.org/r/20180331125332.GF13332@bombadil.infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/idr.c b/lib/idr.c
index 823b813f08f862b4c80463ad69f91ba9acf62703..ed9c169c12bdc966448d96b79de30f899e185a34 100644 (file)
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -4,9 +4,9 @@
 #include <linux/idr.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/xarray.h>
 
 DEFINE_PER_CPU(struct ida_bitmap *, ida_bitmap);
-static DEFINE_SPINLOCK(simple_ida_lock);
 
 /**
  * idr_alloc_u32() - Allocate an ID.
@@ -581,7 +581,7 @@ again:
        if (!ida_pre_get(ida, gfp_mask))
                return -ENOMEM;
 
-       spin_lock_irqsave(&simple_ida_lock, flags);
+       xa_lock_irqsave(&ida->ida_rt, flags);
        ret = ida_get_new_above(ida, start, &id);
        if (!ret) {
                if (id > max) {
@@ -591,7 +591,7 @@ again:
                        ret = id;
                }
        }
-       spin_unlock_irqrestore(&simple_ida_lock, flags);
+       xa_unlock_irqrestore(&ida->ida_rt, flags);
 
        if (unlikely(ret == -EAGAIN))
                goto again;
@@ -615,8 +615,8 @@ void ida_simple_remove(struct ida *ida, unsigned int id)
        unsigned long flags;
 
        BUG_ON((int)id < 0);
-       spin_lock_irqsave(&simple_ida_lock, flags);
+       xa_lock_irqsave(&ida->ida_rt, flags);
        ida_remove(ida, id);
-       spin_unlock_irqrestore(&simple_ida_lock, flags);
+       xa_unlock_irqrestore(&ida->ida_rt, flags);
 }
 EXPORT_SYMBOL(ida_simple_remove);