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SubjectRe: [PATCH RFC LKMM 7/7] tools/memory-model: Dynamically check SRCU lock-to-unlock matching
> > I'm not all that exited about spreading version requirements in the
> > source: we report this requirement in our README, and apparently we
> > already struggle to keep this information up-to-date. So what about
> > squashing something like the below (assume that 7.52 will be released
> > by the time this patch hit mainline; if this won't be the case, we
> > may consider using the development version 7.51+6)? notice that this
> > also removes an (obsolete, at this point) comment from lock.cat.
>
> Sounds like a very good point to me!
>
> Should have pointers in the various files to the README file? Or maybe
> get people used to using scripting that checks versions? Or maybe
> after answering questions for some time, people will get used to
> checking versions?

As discussed off-list: I have no strong opinion on this regard, well,
except that I think we ought to fix the README, somehow (consider my
diff below as a first proposal). Akira actually preceded me on this
and suggested another solution [1].

Andrea

[1] http://lkml.kernel.org/r/04d15c18-d210-e3da-01e2-483eff135cb7@gmail.com


>
> Thanx, Paul
>
> > Andrea
> >
> > diff --git a/tools/memory-model/README b/tools/memory-model/README
> > index 9d7d4f23503fd..b362a41358fa1 100644
> > --- a/tools/memory-model/README
> > +++ b/tools/memory-model/README
> > @@ -20,8 +20,8 @@ that litmus test to be exercised within the Linux kernel.
> > REQUIREMENTS
> > ============
> >
> > -Version 7.49 of the "herd7" and "klitmus7" tools must be downloaded
> > -separately:
> > +Version 7.52 or higher of the "herd7" and "klitmus7" tools must be
> > +downloaded separately:
> >
> > https://github.com/herd/herdtools7
> >
> > diff --git a/tools/memory-model/linux-kernel.cat b/tools/memory-model/linux-kernel.cat
> > index 95bf45f1215fc..8dcb37835b613 100644
> > --- a/tools/memory-model/linux-kernel.cat
> > +++ b/tools/memory-model/linux-kernel.cat
> > @@ -1,7 +1,5 @@
> > // SPDX-License-Identifier: GPL-2.0+
> > (*
> > - * Requires herd version 7.51+6 or higher.
> > - *
> > * Copyright (C) 2015 Jade Alglave <j.alglave@ucl.ac.uk>,
> > * Copyright (C) 2016 Luc Maranget <luc.maranget@inria.fr> for Inria
> > * Copyright (C) 2017 Alan Stern <stern@rowland.harvard.edu>,
> > diff --git a/tools/memory-model/lock.cat b/tools/memory-model/lock.cat
> > index 305ded17e7411..a059d1a6d8a29 100644
> > --- a/tools/memory-model/lock.cat
> > +++ b/tools/memory-model/lock.cat
> > @@ -6,9 +6,6 @@
> >
> > (*
> > * Generate coherence orders and handle lock operations
> > - *
> > - * Warning: spin_is_locked() crashes herd7 versions strictly before 7.48.
> > - * spin_is_locked() is functional from herd7 version 7.49.
> > *)
> >
> > include "cross.cat"
> >
> >
> >
> > > + *
> > > * Copyright (C) 2015 Jade Alglave <j.alglave@ucl.ac.uk>,
> > > * Copyright (C) 2016 Luc Maranget <luc.maranget@inria.fr> for Inria
> > > * Copyright (C) 2017 Alan Stern <stern@rowland.harvard.edu>,
> > > diff --git a/tools/memory-model/linux-kernel.def b/tools/memory-model/linux-kernel.def
> > > index 1d6a120cde14..0c3f0ef486f4 100644
> > > --- a/tools/memory-model/linux-kernel.def
> > > +++ b/tools/memory-model/linux-kernel.def
> > > @@ -49,7 +49,7 @@ synchronize_rcu_expedited() { __fence{sync-rcu}; }
> > >
> > > // SRCU
> > > srcu_read_lock(X) __srcu{srcu-lock}(X)
> > > -srcu_read_unlock(X,Y) { __srcu{srcu-unlock}(X); }
> > > +srcu_read_unlock(X,Y) { __srcu{srcu-unlock}(X,Y); }
> > > synchronize_srcu(X) { __srcu{sync-srcu}(X); }
> > >
> > > // Atomic
> > > --
> > > 2.17.1
> > >
> >
>

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