[patch 100/118] lib/idr.c: remove simple_ida_lock

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From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxxxxxxxxx: idr.c needs xarray.h]
Link: http://lkml.kernel.org/r/20180331125332.GF13332@xxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 lib/idr.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff -puN lib/idr.c~ida-remove-simple_ida_lock lib/idr.c
--- a/lib/idr.c~ida-remove-simple_ida_lock
+++ a/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 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);
_
--
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