From: Matthew Wilcox <willy@infradead.org>
To: Alastair D'Silva <alastair@d-silva.org>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Paul Mackerras" <paulus@samba.org>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"Frederic Barrat" <fbarrat@linux.ibm.com>,
"Andrew Donnellan" <ajd@linux.ibm.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Mauro Carvalho Chehab" <mchehab+samsung@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Rob Herring" <robh@kernel.org>,
"Anton Blanchard" <anton@ozlabs.org>,
"Krzysztof Kozlowski" <krzk@kernel.org>,
"Mahesh Salgaonkar" <mahesh@linux.vnet.ibm.com>,
"Madhavan Srinivasan" <maddy@linux.vnet.ibm.com>,
"Cédric Le Goater" <clg@kaod.org>,
"Anju T Sudhakar" <anju@linux.vnet.ibm.com>,
"Hari Bathini" <hbathini@linux.ibm.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Greg Kurz" <groug@kaod.org>,
"Nicholas Piggin" <npiggin@gmail.com>,
"Masahiro Yamada" <yamada.masahiro@socionext.com>,
"Alexey Kardashevskiy" <aik@ozlabs.ru>,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-nvdimm@lists.01.org, linux-mm@kvack.org
Subject: Re: [PATCH v4 10/25] nvdimm: Add driver for OpenCAPI Persistent Memory
Date: Sat, 28 Mar 2020 19:59:46 -0700 [thread overview]
Message-ID: <20200329025946.GU22483@bombadil.infradead.org> (raw)
In-Reply-To: <20200329025617.GT22483@bombadil.infradead.org>
On Sat, Mar 28, 2020 at 07:56:17PM -0700, Matthew Wilcox wrote:
> On Fri, Mar 27, 2020 at 06:11:47PM +1100, Alastair D'Silva wrote:
> > +static struct mutex minors_idr_lock;
> > +static struct idr minors_idr;
> ...
> > + mutex_lock(&minors_idr_lock);
> > + minor = idr_alloc(&minors_idr, ocxlpmem, 0, NUM_MINORS, GFP_KERNEL);
> > + mutex_unlock(&minors_idr_lock);
> ...
> > + mutex_lock(&minors_idr_lock);
> > + idr_remove(&minors_idr, MINOR(ocxlpmem->dev.devt));
> > + mutex_unlock(&minors_idr_lock);
> ...
> > + mutex_init(&minors_idr_lock);
> > + idr_init(&minors_idr);
>
> Unless you look up ocxlpmem by minor number later in the patch series (and
> most of the series didn't make it to my mailbox), this can just be an ida.
>
> static DEFINE_IDA(minors);
> ...
> minor = ida_alloc_max(&minors, NUM_MINORS, GFP_KERNEL);
Oops. NUM_MINORS - 1. Or #define MAX_MINOR 255 since you only seem to use
NUM_MINORS in this one place.
> ...
> ida_free(&minors, MINOR(ocxlpmem->dev.devt));
> ...
> and you can drop the dynamic initialisation. And the mutex.
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next prev parent reply other threads:[~2020-03-29 3:00 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-27 7:11 [PATCH v4 00/25] Add support for OpenCAPI Persistent Memory devices Alastair D'Silva
2020-03-27 7:11 ` [PATCH v4 01/25] powerpc/powernv: Add OPAL calls for LPC memory alloc/release Alastair D'Silva
2020-04-01 8:48 ` Dan Williams
2020-04-01 22:51 ` Alastair D'Silva
2020-03-27 7:11 ` [PATCH v4 02/25] mm/memory_hotplug: Allow check_hotplug_memory_addressable to be called from drivers Alastair D'Silva
2020-04-01 8:48 ` Dan Williams
2020-04-02 4:33 ` Alastair D'Silva
2020-03-27 7:11 ` [PATCH v4 03/25] powerpc/powernv: Map & release OpenCAPI LPC memory Alastair D'Silva
2020-04-01 8:48 ` Dan Williams
2020-04-02 4:36 ` Alastair D'Silva
[not found] ` <f763d9d8487e77006b233bc16e0883f956850b6c.camel@kernel.crashing.org>
2020-04-03 4:27 ` Michael Ellerman
2020-03-27 7:11 ` [PATCH v4 04/25] ocxl: Remove unnecessary externs Alastair D'Silva
2020-04-01 8:48 ` Dan Williams
2020-03-27 7:11 ` [PATCH v4 05/25] ocxl: Address kernel doc errors & warnings Alastair D'Silva
2020-04-01 8:49 ` Dan Williams
2020-03-27 7:11 ` [PATCH v4 06/25] ocxl: Tally up the LPC memory on a link & allow it to be mapped Alastair D'Silva
2020-04-01 8:48 ` Dan Williams
2020-04-02 6:21 ` Andrew Donnellan
2020-03-27 7:11 ` [PATCH v4 07/25] ocxl: Add functions to map/unmap LPC memory Alastair D'Silva
2020-04-01 8:49 ` Dan Williams
2020-04-03 3:50 ` Alastair D'Silva
2020-03-27 7:11 ` [PATCH v4 08/25] ocxl: Emit a log message showing how much LPC memory was detected Alastair D'Silva
2020-04-01 8:49 ` Dan Williams
2020-04-02 1:29 ` Joe Perches
2020-04-03 3:52 ` Alastair D'Silva
2020-03-27 7:11 ` [PATCH v4 09/25] ocxl: Save the device serial number in ocxl_fn Alastair D'Silva
2020-03-27 7:11 ` [PATCH v4 10/25] nvdimm: Add driver for OpenCAPI Persistent Memory Alastair D'Silva
2020-03-29 2:56 ` Matthew Wilcox
2020-03-29 2:59 ` Matthew Wilcox [this message]
2020-04-01 8:49 ` Dan Williams
2020-04-01 19:35 ` Dan Williams
2020-03-27 7:11 ` [PATCH v4 11/25] powerpc: Enable the OpenCAPI Persistent Memory driver for powernv_defconfig Alastair D'Silva
2020-04-01 20:26 ` Dan Williams
2020-03-27 7:11 ` [PATCH v4 12/25] nvdimm/ocxl: Add register addresses & status values to the header Alastair D'Silva
2020-04-01 20:27 ` Dan Williams
2020-03-27 7:11 ` [PATCH v4 13/25] nvdimm/ocxl: Read the capability registers & wait for device ready Alastair D'Silva
2020-04-02 0:20 ` Dan Williams
2020-03-27 7:11 ` [PATCH v4 14/25] nvdimm/ocxl: Add support for Admin commands Alastair D'Silva
2020-04-02 6:41 ` Dan Williams
2020-03-27 7:11 ` [PATCH v4 15/25] nvdimm/ocxl: Register a character device for userspace to interact with Alastair D'Silva
2020-04-02 0:27 ` Dan Williams
2020-03-27 7:11 ` [PATCH v4 16/25] nvdimm/ocxl: Implement the Read Error Log command Alastair D'Silva
2020-04-03 0:54 ` Dan Williams
2020-03-27 7:11 ` [PATCH v4 17/25] nvdimm/ocxl: Add controller dump IOCTLs Alastair D'Silva
2020-03-27 7:11 ` [PATCH v4 18/25] nvdimm/ocxl: Add an IOCTL to report controller statistics Alastair D'Silva
2020-03-27 7:11 ` [PATCH v4 19/25] nvdimm/ocxl: Forward events to userspace Alastair D'Silva
2020-04-02 2:08 ` Dan Williams
2020-03-27 7:11 ` [PATCH v4 20/25] nvdimm/ocxl: Add an IOCTL to request controller health & perf data Alastair D'Silva
2020-03-27 7:11 ` [PATCH v4 21/25] nvdimm/ocxl: Implement the heartbeat command Alastair D'Silva
2020-03-27 7:11 ` [PATCH v4 22/25] nvdimm/ocxl: Add debug IOCTLs Alastair D'Silva
2020-03-27 7:12 ` [PATCH v4 23/25] nvdimm/ocxl: Expose SMART data via ndctl Alastair D'Silva
2020-03-27 7:12 ` [PATCH v4 24/25] nvdimm/ocxl: Expose the serial number & firmware version in sysfs Alastair D'Silva
2020-03-27 7:12 ` [PATCH v4 25/25] MAINTAINERS: Add myself & nvdimm/ocxl to ocxl Alastair D'Silva
2020-04-01 8:47 ` [PATCH v4 00/25] Add support for OpenCAPI Persistent Memory devices Dan Williams
2020-04-01 22:44 ` Alastair D'Silva
2020-04-02 3:42 ` Michael Ellerman
2020-04-02 3:50 ` Oliver O'Halloran
2020-04-02 10:06 ` Michael Ellerman
2020-04-02 11:10 ` Greg Kurz
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