linux-kernel - Re: [GIT PULL de-alpha] Make core code not need to know about Alpha for v4.15

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Message-ID: <20171025084548.mc7pqlshuzmtci4p@gmail.com>
Date:   Wed, 25 Oct 2017 10:45:48 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        will.deacon@....com, mark.rutland@....com, snitzer@...hat.com,
        thor.thayer@...ux.intel.com, viro@...iv.linux.org.uk,
        davem@...emloft.net, shuah@...nel.org, mpe@...erman.id.au,
        tj@...nel.org
Subject: Re: [GIT PULL de-alpha] Make core code not need to know about Alpha
 for v4.15


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> Hello, Ingo,
> 
> This series is a first step towards making the core kernel no longer
> need to consider DEC Alpha as a special case.  This is accomplished
> by two sets of patches, followed by a Coccinelle script:
> 
> 1.	Patches 1/19 through 15/19 in the following patches, which
> 	change non-Coccinelle-susceptible instances of ACCESS_ONCE()
> 	to either READ_ONCE() or WRITE_ONCE(), as appropriate.	Most of
> 	these patches are courtesy of Mark Rutland.
> 
> 2.	Patches 16/19 through 18/19 in the following patches, which
> 	add smp_read_barrier_depends() to READ_ONCE() and to Alpha's
> 	value-returning _release and _relaxed atomic read-modify-write
> 	operations, while also removing lockless_dereference() in favor
> 	of the modified READ_ONCE().
> 
> 3.	A patch generated by Coccinelle (script in commit log) that
> 	converts ACCESS_ONCE() to either READ_ONCE() or WRITE_ONCE(),
> 	as appropriate.  Of course, this patch should not be applied
> 	as-is to mainline, instead, the Coccinelle script should be
> 	re-run in order to account for any changes between now and
> 	the time of merging into mainline.
> 
> A later series (most likely targeted to v4.16) will remove instances of
> smp_read_barrier_depends() that are made redundant by this series, that
> is to say, almost all of them.
> 
> These changes are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/alpha-cocci
> 
> for you to fetch changes up to d19fa5187a69bd7685e9c7452ce9e339b1b079fc:
> 
>   COCCINELLE: treewide: kill off ACCESS_ONCE() (2017-10-21 12:52:09 -0700)
> 
> ----------------------------------------------------------------
> Mark Rutland (14):
>       dm integrity: Kill off ACCESS_ONCE()
>       EDAC, altera: Kill off ACCESS_ONCE()
>       firmware/ivc: Kill off ACCESS_ONCE()
>       fs: dcache: Kill off ACCESS_ONCE()
>       fs: ncpfs: Kill off ACCESS_ONCE()
>       media: dvb_ringbuffer: Kill off ACCESS_ONCE()
>       net: netlink/netfilter: Kill off ACCESS_ONCE()
>       net/ipv4/tcp_input.c: Kill off ACCESS_ONCE()
>       net: average: Kill off ACCESS_ONCE()
>       samples: mic/mpssd/mpssd.c: Kill off ACCESS_ONCE()
>       selftests/powerpc: Kill off ACCESS_ONCE()
>       workqueue: Kill off ACCESS_ONCE()
>       rcutorture: formal: Prepare for ACCESS_ONCE() removal
>       COCCINELLE: treewide: kill off ACCESS_ONCE()

None of the patches from Mark include your Signed-off-by - I'll add them, let me 
know if that's not OK. I suppose this happened because you rebased his tree?

Thanks,

	Ingo