linux-kernel - Re: [PATCH v2] tools/memory-model: Make compat with herd7 7.47 ("-" -> "

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Date:   Sat, 10 Feb 2018 12:03:39 +0900
From:   Akira Yokosawa <akiyks@...il.com>
To:     paulmck@...ux.vnet.ibm.com
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        stern@...land.harvard.edu, parri.andrea@...il.com,
        will.deacon@....com, peterz@...radead.org, boqun.feng@...il.com,
        npiggin@...il.com, dhowells@...hat.com, j.alglave@....ac.uk,
        luc.maranget@...ia.fr, Patrick Bellasi <patrick.bellasi@....com>,
        Akira Yokosawa <akiyks@...il.com>
Subject: Re: [PATCH v2] tools/memory-model: Make compat with herd7 7.47 ("-"
 -> "_")

On 2018/02/10 10:07, Paul E. McKenney wrote:
> On Sat, Feb 10, 2018 at 08:46:25AM +0900, Akira Yokosawa wrote:
>> >From 7c1f497a9a51e8db1a94c8a7ef0b74b235aaab88 Mon Sep 17 00:00:00 2001
>> From: Akira Yokosawa <akiyks@...il.com>
>> Date: Fri, 9 Feb 2018 04:51:05 -0800
>> Subject: [PATCH v2] tools/memory-model: Make compat with herd7 7.47 ("-" -> "_")
>>
>> As of herd7 7.47, these '-'s are not permitted and end up in
>> errors such as:
>>
>>     File "./linux-kernel.def", line 44, characters 29-30:
>>     unexpected '-' (in macros)
>>
>> Partial revert of commit 2d5fba7782d6 ("linux-kernel*: Make RCU
>> identifiers match ASPLOS paper") in the repository at
>> https://github.com/aparri/memory-model can restore the compatibility
>> with herd7 7.47.
>>
>> Reported-by: Patrick Bellasi <patrick.bellasi@....com>
>> Suggested-by: Andrea Parri <parri.andrea@...il.com>
>> Signed-off-by: Akira Yokosawa <akiyks@...il.com>
>> ---
>> Paul,
>>
>> FWIW, this is a squashed version relative to patch 07/10 in the RFC series.
> 
> Thank you, Akira!
> 
> I am going to hold off on this for a bit to see if we can instead get
> a new release of herd7, but if we can't. this might well be a very good
> way to go.

Fair enough.

   Thanks, Akira

> 
> 							Thanx, Paul
> 
>>     Thanks, Akira
>> --
>>  tools/memory-model/linux-kernel.bell | 14 +++++++-------
>>  tools/memory-model/linux-kernel.cat  |  2 +-
>>  tools/memory-model/linux-kernel.def  |  8 ++++----
>>  3 files changed, 12 insertions(+), 12 deletions(-)
>>
>> diff --git a/tools/memory-model/linux-kernel.bell b/tools/memory-model/linux-kernel.bell
>> index b984bbd..436791b 100644
>> --- a/tools/memory-model/linux-kernel.bell
>> +++ b/tools/memory-model/linux-kernel.bell
>> @@ -25,9 +25,9 @@ enum Barriers = 'wmb (*smp_wmb*) ||
>>  		'rmb (*smp_rmb*) ||
>>  		'mb (*smp_mb*) ||
>>  		'rb_dep (*smp_read_barrier_depends*) ||
>> -		'rcu-lock (*rcu_read_lock*)  ||
>> -		'rcu-unlock (*rcu_read_unlock*) ||
>> -		'sync-rcu (*synchronize_rcu*) ||
>> +		'rcu_lock (*rcu_read_lock*)  ||
>> +		'rcu_unlock (*rcu_read_unlock*) ||
>> +		'sync_rcu (*synchronize_rcu*) ||
>>  		'before_atomic (*smp_mb__before_atomic*) ||
>>  		'after_atomic (*smp_mb__after_atomic*) ||
>>  		'after_spinlock (*smp_mb__after_spinlock*)
>> @@ -35,8 +35,8 @@ instructions F[Barriers]
>>
>>  (* Compute matching pairs of nested Rcu-lock and Rcu-unlock *)
>>  let matched = let rec
>> -	    unmatched-locks = Rcu-lock \ domain(matched)
>> -	and unmatched-unlocks = Rcu-unlock \ range(matched)
>> +	    unmatched-locks = Rcu_lock \ domain(matched)
>> +	and unmatched-unlocks = Rcu_unlock \ range(matched)
>>  	and unmatched = unmatched-locks | unmatched-unlocks
>>  	and unmatched-po = [unmatched] ; po ; [unmatched]
>>  	and unmatched-locks-to-unlocks =
>> @@ -46,8 +46,8 @@ let matched = let rec
>>  	in matched
>>
>>  (* Validate nesting *)
>> -flag ~empty Rcu-lock \ domain(matched) as unbalanced-rcu-locking
>> -flag ~empty Rcu-unlock \ range(matched) as unbalanced-rcu-locking
>> +flag ~empty Rcu_lock \ domain(matched) as unbalanced-rcu-locking
>> +flag ~empty Rcu_unlock \ range(matched) as unbalanced-rcu-locking
>>
>>  (* Outermost level of nesting only *)
>>  let crit = matched \ (po^-1 ; matched ; po^-1)
>> diff --git a/tools/memory-model/linux-kernel.cat b/tools/memory-model/linux-kernel.cat
>> index babe2b3..d0085d5 100644
>> --- a/tools/memory-model/linux-kernel.cat
>> +++ b/tools/memory-model/linux-kernel.cat
>> @@ -32,7 +32,7 @@ let mb = ([M] ; fencerel(Mb) ; [M]) |
>>  	([M] ; fencerel(Before_atomic) ; [RMW] ; po? ; [M]) |
>>  	([M] ; po? ; [RMW] ; fencerel(After_atomic) ; [M]) |
>>  	([M] ; po? ; [LKW] ; fencerel(After_spinlock) ; [M])
>> -let gp = po ; [Sync-rcu] ; po?
>> +let gp = po ; [Sync_rcu] ; po?
>>
>>  let strong-fence = mb | gp
>>
>> diff --git a/tools/memory-model/linux-kernel.def b/tools/memory-model/linux-kernel.def
>> index a397387..fc08371 100644
>> --- a/tools/memory-model/linux-kernel.def
>> +++ b/tools/memory-model/linux-kernel.def
>> @@ -41,10 +41,10 @@ spin_unlock(X) { __unlock(X) ; }
>>  spin_trylock(X) __trylock(X)
>>
>>  // RCU
>> -rcu_read_lock() { __fence{rcu-lock}; }
>> -rcu_read_unlock() { __fence{rcu-unlock};}
>> -synchronize_rcu() { __fence{sync-rcu}; }
>> -synchronize_rcu_expedited() { __fence{sync-rcu}; }
>> +rcu_read_lock() { __fence{rcu_lock}; }
>> +rcu_read_unlock() { __fence{rcu_unlock};}
>> +synchronize_rcu() { __fence{sync_rcu}; }
>> +synchronize_rcu_expedited() { __fence{sync_rcu}; }
>>
>>  // Atomic
>>  atomic_read(X) READ_ONCE(*X)
>> -- 
>> 2.7.4
>>
>>
>