linux-kernel - Re: [PATCH RESEND v8 0/3] Introduce RCU string API

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Message-ID: <20150110195647.GA8063@linux.vnet.ibm.com>
Date:	Sat, 10 Jan 2015 11:56:48 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Omar Sandoval <osandov@...ndov.com>
Cc:	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	David Sterba <dsterba@...e.cz>,
	Josh Triplett <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH RESEND v8 0/3] Introduce RCU string API

On Fri, Jan 09, 2015 at 12:35:57PM -0800, Omar Sandoval wrote:
> Hi, everyone,
> 
> Now that the merge window and the holidays are over, I've rebased this on
> v3.19-rc3 for the next merge window.

Wasn't btrfs going to take this one?

If I am supposed to take it, please split out the RCU infrastructure
portion so that I can push it separately.

							Thanx, Paul

> This patch series introduces the RCU string API and cleans up the wreckage of
> sparse warnings which follow from it (shown here from when the patch was
> briefly in the btrfs integration tree):
> 
> On Thu, Nov 27, 2014 at 06:45:20AM +0800, kbuild test robot wrote:
> > tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git integration
> > head:   c7a37618b60026121255c69e042d74ae5631470c
> > commit: 37aad79d90a0cbf82a5eda62dfe3af4241f5aca3 [38/39] Move BTRFS RCU string to common library
> > reproduce:
> >   # apt-get install sparse
> >   git checkout 37aad79d90a0cbf82a5eda62dfe3af4241f5aca3
> >   make ARCH=x86_64 allmodconfig
> >   make C=1 CF=-D__CHECK_ENDIAN__
> >
> >
> > sparse warnings: (new ones prefixed by >>)
> >
> > >> fs/btrfs/check-integrity.c:848:25: sparse: incorrect type in argument 1 (different address spaces)
> >    fs/btrfs/check-integrity.c:848:25:    expected struct rcu_string [noderef] <asn:4>*rcu_str
> >    fs/btrfs/check-integrity.c:848:25:    got struct rcu_string *name
> [snip]
> 
> Version 8 combines the original patch with another patch series I posted to fix
> these warnings, which fixes the botched __rcu annotations that caused some of
> the warnings and refactors the existing uses of rcustring to get rid of the
> rest. There's also a patch to fix an RCU misuse.
> 
> Thanks!
> 
> v8: Get the __rcu annotations right, clean up RCU string-related sparse noise
> v7: Add arguments to kernel doc for printk wrappers, use ##__VA_ARGS
> v6: Add header dependencies to rcustring.h
> v5: Rebase against v3.18-rc3
> v4: Don't return anything from the printk wrappers on the assumption that
> printk will return void someday
> v3: Add __rcu annotation to relevant functions, add Paul's ack and Josh's
> review
> 
> Omar Sandoval (3):
>   Move BTRFS RCU string to common library
>   btrfs: refactor btrfs_device->name updates
>   btrfs: fix suspicious RCU in BTRFS_IOC_DEV_INFO
> 
>  fs/btrfs/check-integrity.c |   6 +--
>  fs/btrfs/dev-replace.c     |  19 ++++----
>  fs/btrfs/disk-io.c         |   6 +--
>  fs/btrfs/extent_io.c       |   4 +-
>  fs/btrfs/ioctl.c           |  14 +++---
>  fs/btrfs/raid56.c          |   2 +-
>  fs/btrfs/rcu-string.h      |  56 ------------------------
>  fs/btrfs/scrub.c           |  15 ++++---
>  fs/btrfs/super.c           |   2 +-
>  fs/btrfs/volumes.c         | 107 ++++++++++++++++++++++++++++++---------------
>  fs/btrfs/volumes.h         |   2 +-
>  include/linux/rcustring.h  |  97 ++++++++++++++++++++++++++++++++++++++++
>  12 files changed, 204 insertions(+), 126 deletions(-)
>  delete mode 100644 fs/btrfs/rcu-string.h
>  create mode 100644 include/linux/rcustring.h
> 
> -- 
> 2.2.1
> 

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