IDR: Expose the XArray lock (3c60e868) · Commits · 戴 / test

Allow users of the IDR to use the XArray lock for their own synchronisation purposes. The IDR continues to rely on the caller to handle locking, but this lets the caller use the lock embedded in the IDR data structure instead of allocating their own lock. Signed-off-by:

Matthew Wilcox <willy@infradead.org> Signed-off-by:

Jason Gunthorpe <jgg@mellanox.com>

include/linux/idr.h

+11 −0

Original line number	Diff line number	Diff line
		@@ -98,6 +98,17 @@ static inline void idr_set_cursor(struct idr *idr, unsigned int val)
		* period).
		*/

		#define idr_lock(idr) xa_lock(&(idr)->idr_rt)
		#define idr_unlock(idr) xa_unlock(&(idr)->idr_rt)
		#define idr_lock_bh(idr) xa_lock_bh(&(idr)->idr_rt)
		#define idr_unlock_bh(idr) xa_unlock_bh(&(idr)->idr_rt)
		#define idr_lock_irq(idr) xa_lock_irq(&(idr)->idr_rt)
		#define idr_unlock_irq(idr) xa_unlock_irq(&(idr)->idr_rt)
		#define idr_lock_irqsave(idr, flags) \
		xa_lock_irqsave(&(idr)->idr_rt, flags)
		#define idr_unlock_irqrestore(idr, flags) \
		xa_unlock_irqrestore(&(idr)->idr_rt, flags)

		void idr_preload(gfp_t gfp_mask);

		int idr_alloc(struct idr , void ptr, int start, int end, gfp_t);

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