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Message-ID: <20171227034340.GC24828@bombadil.infradead.org> Date: Tue, 26 Dec 2017 19:43:40 -0800 From: Matthew Wilcox <willy@...radead.org> To: "Kirill A. Shutemov" <kirill@...temov.name> Cc: linux-kernel@...r.kernel.org, Matthew Wilcox <mawilcox@...rosoft.com>, Ross Zwisler <ross.zwisler@...ux.intel.com>, David Howells <dhowells@...hat.com>, Shaohua Li <shli@...nel.org>, Jens Axboe <axboe@...nel.dk>, Rehas Sachdeva <aquannie@...il.com>, Marc Zyngier <marc.zyngier@....com>, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, linux-nilfs@...r.kernel.org, linux-btrfs@...r.kernel.org, linux-xfs@...r.kernel.org, linux-usb@...r.kernel.org, linux-raid@...r.kernel.org Subject: Re: [PATCH v5 03/78] xarray: Add the xa_lock to the radix_tree_root On Tue, Dec 26, 2017 at 07:54:40PM +0300, Kirill A. Shutemov wrote: > On Fri, Dec 15, 2017 at 02:03:35PM -0800, Matthew Wilcox wrote: > > From: Matthew Wilcox <mawilcox@...rosoft.com> > > > > This results in no change in structure size on 64-bit x86 as it fits in > > the padding between the gfp_t and the void *. > > The patch does more than described in the subject and commit message. At first > I was confused why do you need to touch idr here. It took few minutes to figure > it out. > > Could you please add more into commit message about lockname and xa_ locking > interface since you introduce it here? Sure! How's this? xarray: Add the xa_lock to the radix_tree_root This results in no change in structure size on 64-bit x86 as it fits in the padding between the gfp_t and the void *. Initialising the spinlock requires a name for the benefit of lockdep, so RADIX_TREE_INIT() now needs to know the name of the radix tree it's initialising, and so do IDR_INIT() and IDA_INIT(). Also add the xa_lock() and xa_unlock() family of wrappers to make it easier to use the lock. If we could rely on -fplan9-extensions in the compiler, we could avoid all of this syntactic sugar, but that wasn't added until gcc 4.6.
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