linux-kernel - Re: [Cocci] [v3 05/10] mmap locking API: Improving the Coccinelle software

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Date:   Mon, 30 Mar 2020 10:47:38 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Markus Elfring <Markus.Elfring@....de>
cc:     Michel Lespinasse <walken@...gle.com>,
        Coccinelle <cocci@...teme.lip6.fr>, linux-mm@...ck.org,
        Davidlohr Bueso <dave@...olabs.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Hugh Dickins <hughd@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Liam Howlett <Liam.Howlett@...cle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Matthew Wilcox <willy@...radead.org>,
        Ying Han <yinghan@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [Cocci] [v3 05/10] mmap locking API: Improving the Coccinelle
 software



On Mon, 30 Mar 2020, Markus Elfring wrote:

> >> How will corresponding software development resources evolve?
> >
> > I don't think I understand the question, or, actually, are you asking
> > me or the coccinelle developers ?
>
> I hope that more development challenges will be picked up.
>
> The code from a mentioned source file can be reduced to the following
> test file.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kvm/mmu/paging_tmpl.h?id=7111951b8d4973bda27ff663f2cf18b663d15b48#n122
>
> // deleted part
> static inline int FNAME(is_present_gpte)(unsigned long pte)
> {
> #if PTTYPE != PTTYPE_EPT
> 	return pte & PT_PRESENT_MASK;
> #else
> 	return pte & 7;
> #endif
> }
> // deleted part
>
>
> Application of the software “Coccinelle 1.0.8-00029-ga549b9f0” (OCaml 4.10.0)
>
> elfring@...ne:~/Projekte/Coccinelle/Probe> spatch --parse-c paging_tmpl-excerpt1.h
> …
> (ONCE) CPP-MACRO: found known macro = FNAME
> …
> parse error
>  = File "paging_tmpl-excerpt1.h", line 2, column 41, charpos = 57
>   around = 'unsigned',
> …
> BAD:!!!!! static inline int FNAME(is_present_gpte)(unsigned long pte)
> …
> NB total files = 1; perfect = 0; pbs = 1; timeout = 0; =========> 0%
> nb good = 1,  nb passed = 1 =========> 10.00% passed
> nb good = 1,  nb bad = 8 =========> 20.00% good or passed
>
>
> How would you like to improve the affected software areas?

This can be addressed by adding a macro definition to standard.h.

But once the change is done, I don't see any reason to bother with this.

julia